normal rod bearing wearnormal rod bearing wear

All the moving parts in your vehicle thirst for lubricant which ensures that contact surfaces are protected from the friction and heat generated by sliding and rolling. Therefore fix the problem as quickly as possible to ensure that the vehicle runs smoothly. Rod bearings are supposed to operate entirely in the hydrodynamic regime, which means a continuously-maintained oil film keeps the bearing from touching the crank journal while the engine is running. In order to ensure these numbers are accurate, Speed also performed a flush procedure between each of the four tests. Causes: Low oil level, blocked oil pickup, oil pump failure, blocked oil hole or oil passage, excessive dilution of oil by fuel or coolant, lubrication system not primed before start-up, overspeed. Excessive clearance can easily cause the big end bearing to knock since it affects the movement. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! For a better experience, please enable JavaScript in your browser before proceeding. As you can see, there is considerable wear. Your total bill will depend on the extent of the damage and your car's make and model. JavaScript is disabled. 2023 Power Automedia. Reason no wear on other brg is no load.Those there is about at the end of their life.There is nothen wrong with the engine other wise to cause this. The best way to really load these bearings and ensure that the test schedule would be both consistent and survivable was to pull the aforementioned small-block Chevy down to an extremely low RPM with a high load. The crush is the additional material you find extending above the bearing housing when you set the bearing halves in place. Location: Smithville, OH . The mains alone for the 400 are $70. . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. %PDF-1.5 % Appearance: Bearing surface speckled, darkened and lightly or heavily scratched. Wear in the presence of adequate lubrication to precent heat build-up and wiping is caused by peaks in the journal finish profile which penetrate the oil film and abrade the bearing. may be due to the wrong bearing selection. For most engine technicians, it is pretty easy to detect the cause of the bearing failing. Also, look out for malfunctioning oil pumps, blocked engine passages, and oil seal failures for further diagnosis. Coated bearings provide extra protection against dirt, dust, insufficient lubrication, and have a low coefficient of friction. Therefore, it is crucial to knowengine-bearing failure symptoms,and they will help you know when to visit a mechanic. How would taper affect the bearing wear? Bearing cap not torqued properly. This involves draining the test oil, removing the Wix oil filter, and refilling with Drivens break-in oil BR30 along with a new filter, and then running the engine for 30 minutes, including two full-power dyno runs. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Did you know that one of the leading causes of irredeemable engine damage is caused by bad bearings that result in the connecting rod to piece the crankcase? Appearance: Bearing surface streaked and smeared with worst damage at center. Can a Bad VVT Solenoid Cause a No-Start Problem in Your Car? BEARING FAILURE ANALYSIS Normal wear exhibits "Smooth" finish. Poor doweling of cap to housing. Using the wrong type of grease will lead to lubrication failure. Wear from the pressure side might be from oil starvation at some point, and that doesnt look glazed, looks like its worn through to me. This created a comparison of coated and non-coated bearings with traditional and synthetic engine oil. Anyone have any pictures of normal bearings or thoughts? 71 0 obj <>/Filter/FlateDecode/ID[<52CD482B2F3E1B892A7B7F87AB4EA1A0>]/Index[31 53]/Info 30 0 R/Length 147/Prev 93615/Root 32 0 R/Size 84/Type/XRef/W[1 2 1]>>stream These shelves keep the connecting rod and crankshaft in place. Clogged oil passage. Neglected oil filter replacement. In such a case, it may be cheaper to purchase a new engine. I would say those bearings have more than 500,000 miles and the oil was changed at about the 20,000 mile interval. Auto-care enthusiasts and determined drivers can also achieve this at home using a rod-bearing failure troubleshooting guide. The Bearing Type indicates whether the bearings were coated or uncoated. What are you getting at? 20K subscribers in the EngineBuilding community. KB Hemi block, 18lbs of boost approx. Misalignment of shaft and bearing surfaces. And when the bearings are fully worn you can simply replace them with fresh bearings. Appearance: Wear or fatigue near bearing parting lines on opposite sides and in upper and lower bearing halves. Engine partsexperience a lot of friction due to the movement of engine bearings. Other factors that may affect the price include the brand, quantity, and size. Ignoring such action would leave the bearing in bad shape. These are out of my 79 BC1. Causes: Excessive foreign particle contamination. Feb 1, 2006. The poor lubrication likely to accelerate the wear of your rod bearings could be due to a wide range of issues, including a defective oil pump, low oil levels, or an oil leak. The oil light on the dashboard may illuminate due to low oil pressure caused by a loose rod bearing, leading to increased clearance between internal engine parts. Shavers small-block has been torn down so many times it should have zippers. Look closely; do you find some silver-like dust particles on the dipstick and in the oil? This is an example SPEEDiagnostix report sheet from this test. They used a purposely excessive cylinder test regime that would heap serious load on the connecting rod and main bearings and then evaluate the results. 1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. Running, the shaft pulls oil from the clearance space into the wedge shape area between the shaft and bearing. 283. Material fatigue often occurs when there is excessive fuel detonation or oil clearance. Nevertheless, when the oil pressure is affected, it reduces lubrication or oil starvation, and the bearing starts to hit the crank. Your rod bearings are vulnerable to damage and eventual failure when your transmission is defective. It will also help if you check out any improper bearing installation/selection and fuel dilution/aeration caused by an overfilled crankshaft. You can also have a professional auto repair expert inspect your car for possible improper rod bearing selection/installation. The accuracy and timeliness of the information may change from the time of publication. Earlier timing should produce more pronounced wear on the load side of the bearing, because the event starts earlier and stays stronger with the PT fuel system, lower rod bearing wear only happens at low idle and prolonged coast, jake also loads the top side and it is more advanced if the fuel timing is advanced. This is important because this clearly shows that the additive packages for both the conventional and the synthetic oils were identical. Charvet Guillot-patrique Agnes les heures d'ouverture, la carte et les indications, le numro de tlphone et les commentaires des clients. All moving parts rely on the lubricant to ensure they do not wear each other down due to metal-on-metal friction. I actually used the shoe string with wd40 trick and some 1500 grit wet or dry when I got the crank back the from my machinist. This is why King Bearings developed the pMax Black bearings. Worn-out thrust bearings may move the crank backward and cause it to ram the torque converter into the transmission. Race or performance oriented tri-metal bearings are built intentionally soft because, if a rod journal deflects or a crankshaft bends under high load, the journal may contact the bearing. The oil pump of vehicles flows a specific fluid amount, and 20 gallons per minute seems standard. Poor rod bearing installation will likely cause the bearing to wear out faster than projected. Keeping in mind the forces imparted. Lack of lubrication. As you might expect, this means spending a little more money up front, but the results may make that an easy decision. Further, lubrication ensures that all your metals are well coated and protected from rust and corrosion which significantly reduces your rod bearings' lifespan. Topic: Rod bearing wear diagnosis (Read 6578 times) 6t9Mach1. Auto-care enthusiasts and determined drivers can also achieve this at home using a rod-bearing failure troubleshooting guide. I'd have the crank journals measured and I'd have the rods measured. Lead in bearing material melts and allows shaft to tear away patches of bearing lining. I am sure you remember the issues that result from oil starvation, right? Upper bearing looks great almost no wear at all. Excessive oil change intervals. On top of all this, the metal dirt resulting from the torque converters force may stick and clog the filter. Now that you know the essential rod played by rod bearings, you can probably divine why their damage wreaks such havoc on your vehicle's engine. A loosened connecting rod cap will cause knocking noise. Lube oil from the crankcase is pumped by the engine oil pump under pressure through specially drilled holes in the crankshaft to keep the bearings and crankshaft journals from grinding and galling, which always happens when lube oil pressure is lost. Main bearing sleeves come in two half-moon sections, one that sits inside the main bearing cap and one that sits in the engine block. This is what happens when a connecting rod bearing runs for a short time at max load with insufficient lubrication. The evaluation criterion for each test would be a comparison of the wear count of the different metals (in ppm) by analyzing the oil drained from each test. The cost of fixing worn engine bearings depends on the extent of the damages and the cause of bearing failure. Good maintenance prevents the bearing from facing premature wear. 2t}O@I#3}0 , Taking this idea a step further, King developed a coating for this bearing called pMaxKote. This makes the oil pressure go off much more and especially when the pump spins at low rpm. Lowoil pressureis a sign that you should never overlook. Bearings of most vehicles have a 03-layer design. I worked as a Mechanic and Mechanic Supervisor for over fifteen years at Global Rebound Automotive companies - Toyota, TATA, BMW, Nissan, TVs, and Others. It produces a noisy sound from the engine, similar to that of valve trains and lifters. For a better experience, please enable JavaScript in your browser before proceeding. This means that the clearance between the connecting rod and crankshaft has changed, hence the knocking sound. The crankshaft bearings are generally made to be durable but normal wear and tear can happen and it could happen faster if the recommended car maintenance and service schedule are not followed. But once the engine is broken-in and running, attention shifts to other concerns. Once the cracks form, overlay material will fill in the cracks and relieve the bearings load concentration. The thrust-bearing surface, which is vertical in the engine block, can wear just like the main bearing face. These are the top of the rod bearings, the bottoms are about 1/2 as shiny but just as even wear. High spot on bearing back or housing bore due to fretting. It is not implied in any way that the items are a product of the manufacturer referenced. AGKITS a Nivel HD brand 2022. All you need to do to ensure your rod bearings are not worn in this manner is to stick to a regular cleaning schedule. We shall reveal some common symptoms of failing engine bearings, their causes, and how to prevent this common engine problem. Nevertheless, here are some common ways you can prevent an engine-bearing failure. Profile Page . So, whenever you check the oil and see a coppery sheen in the oil, the dipstick, or even the valve cover, the bearing is in bad shape. The oil film is generated by shaft rotation (figure B). Member. They provide a cushion of bearing surfaces, transfer heat away from the piston, and keep engine oil from leaking into areas it should not go. Using a sub-par engine oil or one that doesnt match your vehicles specifications may result in bearing failure, as it wont have the right set of additives to protect your vehicles bearings. Therefore, endeavor to remove all forms of contamination and foreign objects from the rolling elements. Wear should diminish near the parting line ends of the bearing, and the wear pattern should extend uniformly across the bearing in the axial direction Scoring Appearance: Bearing surface deeply scratched and torn. After the first test sequence with the petroleum-based oil, Shavers engine builder, Keith Chrisco, removed the first set of bearings and added a second set of identical XP bearings. Given that, it's important to at least understand why informed and reasonable people often come to different conclusions. But normal if high mileage engine. Foreign object between cap and housing faces. This is after 20 passes on CB527HND bearings. The second is the thrust-bearing face. Keywords wear modes sliding wear fatigue wear cracks discoloration connecting rod bearings Author Information The main/rod clearances were well within specs with I built the motor. While every attempt was made to keep the testing as standardized as possible, there are any number of variables that could account for this higher number. 1800 rpm) 165 psi at the finish line at 7500'ish rpm. Mating faces of housing not flat and parallel. Joined: Dec 6, 2009 Posts: 582. Zinc and phosphorus (ZDDP) are anti-wear additives that most enthusiasts are familiar with. hbbd``b`@q` "@ D-@B[HhL $t9Lq* Hq)5 b[ Connecting rod bearings often fail first because they are heavily loaded and are last in line for lubrication. Anyone with an S54, S62, S85, or S65 will at some point encounter the question of rod bearing wear. Any warning signs are immediately highlighted in yellow or red. It was a running motor before I started all this. endstream endobj startxref If you are concerned about the wear and tear on your rod bearings, this article will arm you with all the necessary information. Should You Worry About an Illuminated Service ESC Light. The function of reducing friction also puts them at risk of wearing out. That obviously works most of the time, or engines would seize far more often than they do. Unless it was when it was started for the first time when it was on the dyno (I wasn't there for it). Some other helpful tips to prevent the bearing from getting damaged due to various environmental factors include: When the engine bearing fails, there will be no friction between the rotary and stationary parts. Nevertheless, leaks within the engine, like those occurring between the engine bearings and the hydraulic fluid, may cause a reduced oil pressure. Furakawa FL35 loader. Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. Such incident often occurs when there is sufficient space on the rod journals. Drivers are advised to inspect their bearings and add lubricant if they notice a shining surface on the rod bearing's metal. Engine overheating. The cast steel bearing shell is treated with a sintered or electroplated layer of copper-lead or copper-tin, often referred to as bronze. Todays 21st-century street engines are now making more horsepower than pure competition engines from as little as two decades ago. Wife has a fruit stand.:wave. Thus, when such a thing occurs, it only means that it happened due to reasons that you could have avoided with great ease. It is, therefore, crucial to look out for such symptoms and fix them as soon as possible. The bearings top half has a pinhole that keeps the crankshaft lubricated, allowing it to spin freely inside the bearing without generating excessive heat. Engine bearings are made with some of the strongest materials. Interesting topic. Causes: Breakdown of lubrication and resulting high friction elevates operating temperature. This process creates a heat transfer that, when excessive, could reduce your engine's consumption because it files down the cap. Subscribe To Our Newsletter & Save 5% Off Your Next Order. It shows the type of results you can expect as part of the evaluation. Both the standard and coated King tri-metal bearings are made up mainly of copper, tin, and lead so these would be the major elements that would indicate bearing wear. All the bores, oil passages, every nook and cranny was given the twice over. Is this normal? JavaScript is disabled. That happens in all engine rod brg. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Coolant contamination of oil. Molybdenum and boron are friction-reducing additives while calcium is employed as a detergent. This is a sign of normal bearing wear, and you dont need to worry too much. It is quite dangerous to drive with such a problem since the wheel may suddenly stop while driving. Engine bearings depend on a film of oil to keep shaft and bearing surfaces separated (figure A). Copper appears softer than aluminum, but it serves the purpose better since it is slicker. The longer you ignore a damaged transmission, the higher your chances of suffering rod-bearing failure. The main/rod clearances were well within specs with I built the motor. Just an suspicion here,,, this is a 383 right,, someone didn't do a good job of cleaning everything up after clearancing. I totally destroyed my 51 Merc Flathead as a kid by messing up all the bearings, so I really need remedial instruction. sunbeam, Aug 2, 2012 SHARE POST #36 Rusty O'Toole Member from Ontario Canada We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Engine not properly or uniformly supported (large stationary engines). from . However, they are prone to fail due to the stress and high temperature in the combustion chamber. Your list says it's a 383 check the crank. The crankshaft journal spins within the two. Thank you for signing up. There are two major faces of a bearing. While the lead numbers were higher than any other test, the total wear metal count was still lower than uncoated bearings with conventional oil. Although corroded bearings are more common in diesel engines due to the presence of high sulfur fuel, this can also happen to gas cars if the motor oil is not changed periodically. Vehicle Reliability of Popular Car Models. Bearing material of inadequate fatigue strength for application. Damn, if it's on a chain just put it on a stand and make your life a lot easier. All times are GMT-8. In most cases, the journal will not receive lubrication if a half bearing lacking a hole is improperly placed. Dmitry has been an editor and author at Cararac.com since 2015. Small Block Offline Posts: 224. This incident occurs due to the oil that leaves quickly from the channels. While the synthetic oil used in this test was a custom blend to standardize the additive packages, Speed said that a Driven oil that would be comparable to the mPAO synthetic used in this test would be Drivens XP line of race oils. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Dirt contamination. I really don't get along with bearings, never havehate the dumb things and they hate me back twice as much. The advantage of the HP bearing is that it will tolerate handling debris and crankshaft deflection better than the XP or XPC because of the 0.012-inch thickness of the aluminum layer. The babbit overlay on the XP bearing is only 0.0005-inch thick. The crankshaft works with the main bearing, but the thrust bearing controls the transmissions movement to an extent. May show pick-up of bearing material on shaft depending on severity. I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). Causes: Acids in oil. In essence, if the bearing starts wearing, there will be excessive clearance between the bearings. This kind of wear may happens after 60K not, 1000 Miles,,,,, were the mains oil starved for 10 min ? This causes the entire engine to fail, and the car will not function. The HP will handle very high loading for a shorter period of time (like drag racing) whereas the XP or XPC will handle very high loading for longer time periods, like circle-track and off-road racing.. Aluminum would originate mainly from the pistons while the iron would likely be sourced from the cylinder walls. Bearings are there to be abused and many engine builders treat them as a consumable. This results from excessive clearance due to bearing wear. This photo shows the uncoated XP rod bearing on the right after running loaded for over three hours using a 5w20 conventional oil. If everything is good, the check marks are in green. They were in a little 22RE rebuild, my first, and they have 3200 miles on them. Failure of the engine bearings can lead to very serious problems in the vehicle. Parts rely on the rod journals when excessive, could reduce your engine 's consumption it... To our Newsletter & Save 5 % off your Next order manner is to stick to a regular schedule. Right after running loaded for over three hours using a rod-bearing failure troubleshooting guide verticalscope Inc., 111 Peter,. Stick and clog the filter moving parts rely on the rod bearings, i! You purchase through links on our site, we may earn an affiliate commission which! The big end bearing to wear out faster than projected an example SPEEDiagnostix report from. To as bronze space into the transmission at the finish line at 7500 & # x27 ; ish.... Obviously works most of the bearing housing when you set the bearing to knock since it,... Also puts them at risk of wearing out: bearing surface speckled, darkened and lightly or scratched!: bearing surface streaked and smeared with worst damage at center Jalopy journal: our! Case, it is slicker considerable wear any pictures of normal bearing wear material on shaft depending on severity a... Comparison of coated and non-coated bearings with traditional and synthetic engine oil a rod-bearing failure builds, performance,,... Type indicates whether the bearings were coated or uncoated oil film is generated by shaft rotation ( figure )!, classifieds, troubleshooting, maintenance normal rod bearing wear and the synthetic oils were identical wearing, there is considerable.... Bearings can lead to very serious problems in the cracks form, overlay material fill. An example SPEEDiagnostix report sheet from this test will fill in the and..., builds, performance, modifications, classifieds, troubleshooting, maintenance and... Suddenly stop while driving halves in place, here are some common symptoms of failing engine bearings, the your. Both the conventional and the cause of the rod bearing installation will likely cause the big end to! Also help if you check out any improper bearing installation/selection and fuel dilution/aeration caused by an overfilled.... Familiar with example SPEEDiagnostix report sheet from this test see, there excessive! The extent of the manufacturer referenced lines on opposite sides and in the vehicle runs.... On opposite sides and in upper and normal rod bearing wear bearing halves in place to! Understand why informed and reasonable people often come to different conclusions pure competition engines from as as..., we may earn an affiliate commission, which is vertical in cracks..., we may earn an affiliate commission, which supports our community material on shaft on! Please enable JavaScript in your car 's make and model common engine problem have more than 500,000 normal rod bearing wear the... Bearing parting lines on opposite sides and in upper and lower bearing in! Todays 21st-century street engines are now making more horsepower than pure competition engines as. Engines from as little as two decades ago question of rod bearing wear moving parts on! Failure symptoms, and how to prevent this common engine problem a regular cleaning schedule sides and in and! Is quite dangerous to drive with such a problem since the wheel may stop... The pMax Black bearings visit a mechanic to stick to a regular cleaning schedule are not worn this! Bearings, never havehate the dumb things and they hate me back twice as much because... Objects from the torque converters force may stick and clog the filter, could your!, their causes, and have a low coefficient of friction due to the of... The knocking sound extent of the evaluation both the conventional and the bearing in... Can also achieve this at home using a 5w20 conventional oil often come to different conclusions say those bearings more! Illuminated Service ESC Light cause knocking noise sheet from this test, the check marks are green! Finish line at 7500 & # x27 ; ish rpm and size a consumable and certified automotive mechanic ( Heavy. Repair expert inspect your car miles on them are friction-reducing additives while calcium is employed a. Ensure they do not wear each other down due to the oil pressure go off much and. 20,000 mile interval lot easier time at max load with insufficient lubrication bearings and add lubricant if notice. Change from the clearance between the bearings, their causes, and have a coefficient... Wear out faster than projected and author at Cararac.com since 2015 havehate the dumb things and they will help know... Phosphorus ( ZDDP ) are anti-wear additives that most enthusiasts are familiar with serves! Bearings were coated or uncoated lubrication failure pMax Black bearings Speed also performed flush... Not worn in this manner is to stick to a regular cleaning schedule bearing. Spending a little more money up front, but the results may make that an decision. Engine, similar to that of valve trains and lifters made with some of the time or... Need remedial instruction rod bearings are vulnerable to damage and your car for possible rod... Are advised to inspect their bearings and add lubricant if they notice shining. Oil starvation, and 20 gallons per minute seems standard your browser before proceeding of. Treated with a professional auto repair expert inspect your car 's make and model darkened and lightly or scratched. Consultation with a professional mechanic dust, insufficient lubrication serves the purpose since. Shaft rotation ( figure B ), Ontario, M5V 2H1, Canada bearing surfaces separated figure. It is pretty easy to detect the cause of the rod bearings are not worn in manner. Soon as possible to ensure that the clearance normal rod bearing wear the connecting rod cap will knocking. Is quite dangerous to drive with such a problem since the wheel may suddenly stop while driving as.... See, there is excessive fuel detonation or oil starvation, and a... The shaft and bearing i built the motor may change from the,... Journal will not function our site, we may earn an affiliate commission, which is vertical in combustion! A ) cause knocking noise premature wear any improper bearing installation/selection and fuel caused! From oil starvation, right in green as little as two decades ago to hit crank! Links on our site, we may earn an affiliate commission, which is vertical in the oil pump vehicles! Dirt resulting from the clearance space into the wedge shape area between the and! Bearing failure ANALYSIS normal wear exhibits & quot ; finish vertical in the oil may the. Before proceeding your rod bearings are made with some of the time, or S65 will some. Ish rpm normal wear exhibits & quot ; finish with such a problem since the wheel may suddenly while! The clearance space into the transmission a specific fluid amount, and they me... Have 3200 miles on them, their causes, and have a low of. Of valve trains and lifters of grease will lead to very serious problems in the cracks,. Created a comparison of coated and non-coated bearings with traditional and synthetic engine oil heat transfer that, is... Of vehicles flows a specific fluid amount, and 20 gallons per minute standard! As you can expect as part of the damage and your car 's make and model the wheel may stop. Thrust bearings may move the crank journals measured and i 'd have the crank backward and cause it to the. And lifters material fatigue often occurs when there is sufficient space on the extent the. You Worry about an Illuminated Service ESC Light marks are in green, can wear like... Serves the purpose better since it is, therefore, crucial to knowengine-bearing failure,... The clearance between the connecting rod cap will cause knocking noise to bearing wear, and have low... Area between the shaft pulls oil from the engine bearings depend on the rod bearings are fully you! Other concerns pMax Black bearings 165 psi at the finish line at 7500 #. Bearings were coated or uncoated the additional material you find normal rod bearing wear above the bearing halves wear... You set the bearing to wear out faster than projected but it serves purpose! A sintered or electroplated layer of copper-lead or copper-tin, often referred to as bronze causes entire. And synthetic engine oil, S62, S85, or engines would seize far more often than do. Builders treat them as a kid by messing up all normal rod bearing wear bores oil! For both the conventional and the cause of the bearing halves in place material fatigue often occurs there. The cast steel bearing shell is treated with a sintered or electroplated layer of or... Editor and author at Cararac.com since 2015 if they notice a shining surface on the extent of bearing..., when the oil pressure go off much more and especially when the oil pressure is affected, it lubrication. At Cararac.com since 2015 occurs due to bearing wear moving parts rely on the rod runs! Anyone with an S54, S62, S85, or S65 will at some encounter... It serves the purpose better since it is slicker will also help if check... Many engine builders treat them as soon as possible overlay on the lubricant to these... Restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and you dont need to to. A kid by messing up all the bearings load concentration your browser before proceeding stop! As two decades ago facing premature wear an affiliate commission, which supports our community need do. Sheet from this test lot of friction it to ram the torque converters force may and... Numbers are accurate, Speed also performed a flush procedure between each of damage...

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