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07-23-2015, 06:30 PM | #1 |
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Another Bearing thread
So today my baby went under the knife and got new bearings. The shop just texted me a few pictures of the stock bearings. Needless to say, it was a good move doing this now. My car has 62k miles on it and although I haven't had any issues yet, the shape of the plugs, diff oil, air filter, etc (plus the carfax and uoa report) told me that it hadn't seen regular maintenance. Plus I have just terrible luck, so I figured if anyone was going to be hit with this bearing issue it was me. Unfortunately I was right. All of the bearings show wear. A couple are pretty bad with copper showing and one had a pretty sizable groove dug in it. I've attached a couple early pics and will put some better ones up tomorrow once I get them layed out and photographed. To everyone who thinks this effects only a small portion of cars, the number is growing. Car has only been modded for 1500 miles, completely babied (by me, can't speak for the previous two owners) and sees no track use. We put in the vac extra clearance bearing kit which I hope mitigates the problem. Also replaced both motor mounts as they had both fallen apart.
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2013 c63 Amg coupe p31, v7 tune, plm headers, armytrix downpipes, EflexFuel
2008 dct coupe, evolve engine/dct tune, ttp, ms intake, megan exhaust, cf ds. Sold. Last edited by Doc Oc; 07-23-2015 at 06:36 PM.. |
07-23-2015, 06:54 PM | #2 | |
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Could this have led to an engine failure ... jury is out there.
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07-23-2015, 07:04 PM | #4 |
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Good job and on time for 62K, but we saw worse .
Thanks for sharing .
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07-23-2015, 07:13 PM | #5 |
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Thanks for sharing pics. The bearings don't look too bad. The vehicle should have made it to 100K miles at the least. However, this does prove that if the bearings were installed correctly at the factory, poor maintenance/no maintenance as you noted, surely does play a role in failures, as evidenced by your pictures.
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07-23-2015, 07:22 PM | #6 | |
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2013 c63 Amg coupe p31, v7 tune, plm headers, armytrix downpipes, EflexFuel
2008 dct coupe, evolve engine/dct tune, ttp, ms intake, megan exhaust, cf ds. Sold. Last edited by Doc Oc; 07-23-2015 at 08:12 PM.. |
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07-23-2015, 07:44 PM | #7 | |
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07-23-2015, 07:53 PM | #8 | |
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From mgaguru - Bearing shells are composed of a thick steel backing piece with a very thin copper plating and a little thicker layer of soft white metal on the inside. When new the inside bearing surface has a soft buff finish all the way around. As it wears it develops a shiny surface in the middle (all the way across), but may have very little wear near the ends. You will likely find more wear on the upper bearing shell than on the lower one. If you see only white metal on the bearing there is a very good chance the crankshaft is still in good serviceable condition. If you see a very small amount of copper showing through the white metal it's a toss up. If you see any of the steel backing shell showing through the copper, the crankshaft will most likely need to be reground. The copper layer is very thin, so a little more running time would have the steel backing plate exposed to cause severe damage to the crankshaft rod journal surface. Edit: if you were being sarcastic (and I hope you were or I seriously question your motives), ignore everything above
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2013 c63 Amg coupe p31, v7 tune, plm headers, armytrix downpipes, EflexFuel
2008 dct coupe, evolve engine/dct tune, ttp, ms intake, megan exhaust, cf ds. Sold. Last edited by Doc Oc; 07-25-2015 at 01:27 PM.. |
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07-23-2015, 10:25 PM | #10 | |
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https://store.vacmotorsports.com/mobile/vac-performance-coated-rod-bearing-kit-bmw-s65-p3479.aspx They were very low on stock (I think 2 kits left) last week FYI and they're not coming back until mid sept. I liked the idea of some extra clearance plus the coating. Going to redo the job in 40k miles (if I keep it that long) and see how they've worn. |
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07-23-2015, 10:28 PM | #11 |
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I think your sarcasm meter is broken.
BTW: good catch on the bearings. It's always nice to catch something before it breaks in an expensive way! Any crank damage at all?
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07-23-2015, 11:01 PM | #12 | |
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Crank journal condition was the first item on a long list of questions I sent to the shop. I guess we'll find out in the a.m.
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2013 c63 Amg coupe p31, v7 tune, plm headers, armytrix downpipes, EflexFuel
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07-24-2015, 07:33 AM | #14 | |
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07-24-2015, 08:38 AM | #15 | |
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Are you doing a break in period? Or just cranking up and going for it? Haha. |
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07-24-2015, 08:54 AM | #16 | |
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There have been exactly two cases of issues with replacement bearings, hardly enough to draw any conclusions from. This is the first I am reading of rods being "stretched out." |
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07-24-2015, 09:09 AM | #17 | |
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The shop said to take it easy for a 100 miles or so and let them heat cycle a few times before getting on it. Have you heard anything different?
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07-24-2015, 09:18 AM | #18 | |
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And I also disagree with the cosmetic appearance thing you mentioned. If your bearings have worn through the Babbitt to the copper, at some point your engine will fail. The lead is there to protect the crank if issues occur. Its not supposed to be destroyed, its like a crumple zone in a car. Just because it does its job doesn't mean there isn't a problem. Once the lead is gone there's nothing protecting your crank and sooner or later you're gonna know it. We don't need hysteria, but a healthy awareness is a good thing.
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2013 c63 Amg coupe p31, v7 tune, plm headers, armytrix downpipes, EflexFuel
2008 dct coupe, evolve engine/dct tune, ttp, ms intake, megan exhaust, cf ds. Sold. Last edited by Doc Oc; 07-24-2015 at 09:36 AM.. |
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07-24-2015, 09:39 AM | #19 | |
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I am pretty sure i am the only one who has used OEM bolts in a DIY, or a shop install. lolol great. |
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07-24-2015, 09:46 AM | #20 | |
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07-24-2015, 09:49 AM | #21 | |
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I hope so! I guess we have yet to see a rod bolt go bad. I am planning on doing a small ESS supercharger kit, and am really hoping the OEM bolts are "cool" with that. I followed the jointing, setting, and angle torque to a T. But holy shit was it hard to get 6NM and 20NM on the dot on one of those deathly accurate CDI electronic wrenches. You breathe wrong and you'll be at 6.1, and 20.1 lol. |
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07-24-2015, 09:52 AM | #22 |
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I would not be worried about using the stock bolts at all. I wanted to use them but backed down as its hard to tell a 20 year BMW tech and VAC that I trust m3post more. Your bolts were made for the rods and I saw that you definitely torqued them right, so I'd drive with confidence!
I'm going to modify the break in a bit I think. We heat cycled the car and changed the filter but an oil change in 1500 sounds like a good idea. We are leaving to go to the mountains on 7/31. I'm going to take it easy until then but will have to stretch its legs once we get past Asheville.
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2013 c63 Amg coupe p31, v7 tune, plm headers, armytrix downpipes, EflexFuel
2008 dct coupe, evolve engine/dct tune, ttp, ms intake, megan exhaust, cf ds. Sold. |
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