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08-22-2013, 08:15 PM | #1 |
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▀▄ eas | S65 Rod Bearing Replacement: An ongoing "Journal"
Rod bearings have been a hot topic lately, we recently had an opportunity to see beforehand and wanted to share our results with the forum.
![]() 2008 BMW M3: 106,XXX mi: http://www.m3post.com/forums/showthr...1#post14544658 2008 BMW M3: 106,XXX mi: (Blackstone Oil Analysis):http://www.m3post.com/forums/showthr...8#post14611818 2011 BMW M3: 18,XXX mi: http://www.m3post.com/forums/showthr...9#post14786869 2011 BMW M3: 18,XXX mi: (Blackstone Oil Analysis):http://www.m3post.com/forums/showthr...9#post14673191 2008 BMW M3: 53,XXX mi: http://www.m3post.com/forums/showthr...5#post15421055 2008 BMW M3: 53,XXX mi: (Blackstone Oil Analysis): http://www.m3post.com/forums/showthr...1#post15421907 2008 BMW M3: 62,833 mi: http://www.m3post.com/forums/showthread.php?p=16513152 2008 BMW M3: 62,833 mi: (Blackstone Oil Analysis):http://www.m3post.com/forums/showthread.php?p=16513152 2010 BMW M3: 80,XXX mi: http://www.m3post.com/forums/showthread.php?p=16622475 2010 BMW M3: 80,XXX mi: (Blackstone Oil Analysis): http://www.m3post.com/forums/showthread.php?p=16622475
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Tom G. | european auto source (eas)
email: tom@europeanautosource.com · web: https://europeanautosource.com· tel 866.669.0705 · ca: 714.369.8524 x22 GET DAILY UPDATES ON OUR BLOG · FACEBOOK · YOUTUBE · FLICKR · INSTAGRAM Last edited by tom @ eas; 09-13-2014 at 05:11 PM.. |
08-22-2013, 08:15 PM | #2 |
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2008 BMW M3: 106,XXX mi
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Vehicle: 2008 BMW M3, 6MT Production Date: 06/08 Oil Used: TWS Motorsport 10W-60, 7500mi intervals Mileage: 106,XXX mi Fuel: 93 Oct Driving Habits: Mostly highway driving, no track use Oil Analysis: None provided Notes: This particular M3 was fully serviced under scheduled maintenance and meticulously followed thereafter with oil changes every 7500mi. The VF540 Supercharger was installed at 92K. Now at 106K, the thirst for more power set in and a VF620 upgrade was scheduled. After some discussion, we agreed that an inspection was in order during service. Bearings were replaced with VAC Coated HP Bearing Set. Images: ![]() Bearing Comparison (ordered from left to right): 1, 5, 2, 6, 3, 7, 4, 8 ![]() Rod Bearing #1 ![]() Rod Bearing #2 ![]() Rod Bearing #3 ![]() Rod Bearing #4 ![]() Rod Bearing #5 ![]() Rod Bearing #6 ![]() Rod Bearing #7 ![]() Rod Bearing #8 ![]() Closeup, Rod Bearing #8 ![]() ![]() New vs Old Rod Bearing - Comparison ![]() As seen, Connecting Rod bearing #8 suffered the most damage, with all remaining bearings showing considerable wear. Needless to say, prolonging this would have likely resulted in engine failure if not handled sooner. Blackstone Oil Report: ![]()
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Tom G. | european auto source (eas)
email: tom@europeanautosource.com · web: https://europeanautosource.com· tel 866.669.0705 · ca: 714.369.8524 x22 GET DAILY UPDATES ON OUR BLOG · FACEBOOK · YOUTUBE · FLICKR · INSTAGRAM Last edited by tom @ eas; 09-04-2013 at 12:33 PM.. |
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08-22-2013, 08:39 PM | #4 | |
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Man those bearings are beat up. ![]()
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08-22-2013, 09:28 PM | #6 |
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Thanks for posting pictures. Not much to really discuss here other than what has been stated before. The small amount of money to replace the rod bearings at least once in the cars life will be a whole lot cheaper than replacing the entire engine.
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08-22-2013, 09:30 PM | #7 |
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awesome, thanks for sharing EAS
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08-22-2013, 09:48 PM | #9 |
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Tom,
Thank you for posting this. When you guys replace the bearing, is it a direct swap, or are tolerances taken into account, relaxed to accept the thick tws and therefor properly clearanced? I ask as it was already mentioned herein, the VAC bearing will be even tighter as they are coated and therefor only accelerate this problem in the future. Also, how many hours would one expect bearing replacement to take? Thanks!
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08-22-2013, 10:12 PM | #11 | |
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Here's a link to the Calico Coatings FAQ on bearing coatings. Note they recommend 0.0020 - 0.0030 bearing/journal clearance. http://www.calicocoatings.com/faqs/ Calico's CT-1 dry film lubricant used on engine bearings, valve springs, oil pump gears, timing and transmission gears is 0.0002" to 0.0004" thick and generally speaking does not need extra clearances. A benefit of Calico Coated bearings is the allowance for tighter clearances. Keeping in mind that bearing clearances of .002" to .003" are typical for High Performance applications. |
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08-23-2013, 05:18 AM | #12 |
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![]() ![]() ![]() ![]() ![]() ![]() Other upgrades I have done to my M3 since I installed my original VF540 at 92000k miles. http://www.m3post.com/forums/showthr...hlight=Shady+1 I replaced my diff bushing to Turner Motor Sport Aluminum Race bushing and at 100K+ miles http://www.m3post.com/forums/showthr...=843389&page=4 I upgraded my stock OEM clutch to the SPEC Super Twin Disk Clutch. I trusted my Stealership to do the SPEC Super Twin Disk Clutch install on my M3 I hope the rod bearing info on my 100k+ mile M3 was helpful to everyone ![]()
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08-23-2013, 05:45 AM | #13 | ||
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08-23-2013, 08:17 AM | #15 |
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How difficult when replacing the bearings would it be to adjust the clearance to at least be same as OEM with the coated bearings, or even up it a bit more to what the bearing manufacturer actually suggests?
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08-23-2013, 08:45 AM | #16 | |
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Thanks for the information. But we are assuming VAC takes a OEM bearing and then coats it... Is this a correct assumption or do they machine it so the aftercoating measurements are the same as OEM (.001"). I understand the coating might hold up to wear better than the metal, but that is crazy if they lessen clearance... I would also like to see the properties on oil flow across the surface of the coating versus the metal. And Tom, thanks for posting. Lastly, my 2 cents (meaning my opinion - flame suit on): But must I remind everybody we are on a forum. Forums are where people post when things go south (small part of the population). So without having insight on a full population (aka dealership data for the non-entusiast M3 owners), it is hard to say if this really is a problem. I would believe BMW does endurance testing on their engines of cycles more severe than "mostly highway miles" (no offense please) so I have some faith in the BMW engineering (though I still would have changed the clearences...). So I have a hard time understanding if this is truely a problem based on my two previous comments (an accurate population and durability testing). Last edited by happos2; 08-23-2013 at 09:21 AM.. |
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08-23-2013, 08:54 AM | #17 |
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many questions for oP when he returns to this thread, llol.
Is cylinder 8 the most worn (if that is the correct term for whatever is on the bearing) because it's simply cylinder 8? Or all of the bearings suppose to have natural uniform wear throughout 1-8? |
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08-23-2013, 09:33 AM | #18 |
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Bearing #8 looks rough, Why does that bearing significantly wear more then the others? What is the difference with the VAC bearings and OEM? Thanks for the useful info btw.
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08-23-2013, 09:40 AM | #19 | |||
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![]() As or the #8 wear, I don't know...good question. Quote:
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08-23-2013, 11:03 AM | #20 | |
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08-23-2013, 11:29 AM | #21 |
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Whatever happened to BoostedM's car after he did the VAC bearings?
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16 F82 M4 DCT - ZCP - JB4 - 556WHP / 570WTQ 08 ESS VT3-750 - 60-130MPH 6.14s - 10.81 @ 135.13 MPH 690WHP/463WTQ 08 E92 M3 - 1/2 Mile Trap Speed WR - 174.13 MPH |
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08-23-2013, 11:34 AM | #22 | |
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