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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Jun-09-2017, 11:27:05 PM   #461
bigjae1976
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Default Rod Bearings

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Originally Posted by Tp///M3 View Post
I think when BMW did a recall of rod bearing, some dealers recommend 1200 miles break-in.

There should not be any contact between the bearings and crank or your 1200 mile break in period will turn into a break down period.

You really only need to do the 1200 mile break in if you do bore honing and piston ring replacement.

Otherwise, you just go.


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Old Sat, Jun-10-2017, 12:48:47 AM   #462
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Default Re: Rod Bearings

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Originally Posted by bigjae1976 View Post
There should not be any contact between the bearings and crank or your 1200 mile break in period will turn into a break down period.

You really only need to do the 1200 mile break in if you do bore honing and piston ring replacement.

Otherwise, you just go.


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Old Mon, Jun-12-2017, 01:03:41 AM   #463
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Default Re: Rod Bearings

a commend anyone who shares info like this in such detail.
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Old Mon, Jun-19-2017, 01:37:15 AM   #464
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Default Re: Rod Bearings

Slightly different question. It looks like there's an o-ring around one of the oil return lines. Did anyone replace this part during reassembly?
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Old Mon, Jun-19-2017, 02:19:37 AM   #465
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Default Re: Rod Bearings

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Originally Posted by divedoc View Post
Slightly different question. It looks like there's an o-ring around one of the oil return lines. Did anyone replace this part during reassembly?
It is probably worth your while changing any o-ring or gasket you remove....

Only gasket I would reuse after removing is the valve cover gasket.
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Old Mon, Jun-19-2017, 04:53:45 AM   #466
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Default Re: Rod Bearings

The oring appears to be the better quality viton material. I changed it anyways.
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Old Mon, Jun-19-2017, 04:42:25 PM   #467
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Default Re: Rod Bearings

be careful if installing a new o-ring. A gentleman here installed a new one and had delayed oil pressure light result. Turns out he cut the o-ring on installation, his car was on an angle because it was still on jacks in the front and he was sucking air, thankfully he figured it out. This was about a month ago, can't remember name or subject heading, sorry. I wish I had installed a new one. Another thing was the scavenge return tube torque settings, I couldn't find them and felt I under-torqued them, they are very little, but still, wish I had put some blue loctite (the more oil application tolerant version I used for the vanos gear bolts), but I didn't and I regret both that and not installing a new o-ring at the main pickup tube end.
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Old Mon, Jun-19-2017, 05:19:44 PM   #468
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Default Re: Rod Bearings

Good info, thanks all. I've been working on this project for a little while now, sneaking into the garage when I have an hour or two, and I finally pulled the oil pan last night. Bearing replacement will probably start tonight. My credit card's gotten a lot of exercise as I order bits and pieces that I come across that should be replaced as part of this job. Stuff like the high pressure steering line (lots of surface corrosion, no leaks), the braided steel oil line (looks okay, but wasn't sure if I had the new or old one, so what the hell), engine mounts, and so on. The little things along the way -- washers, O-rings, replacement nuts and bolts -- are the really fun ones. I've drawn the line at struts/springs, but just barely...
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Old Tue, Jun-20-2017, 02:20:35 AM   #469
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Default Re: Rod Bearings

Big thumbs-up again to SYT_Shadow and bimmerfan08 for publishing their rod bearing DIYs. I completed the rod bearing portion of the job tonight.



2003 M3, 103k miles. I've put on about 1000 of those miles myself, and I'm the 4th owner. Bearings look decent with some wear on the upper bearings of cyls 2 and 6. You can see copper on #2, and some kind of change in the surface on #6. Now, on to all of the other stuff I can reach down there.
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Old Tue, Jun-20-2017, 02:35:17 AM   #470
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Default Re: Rod Bearings

So while I was doing this job, I noticed the the old bearings were stamped with the numbers "037/038." The new ones were marked "039/040." Any idea what the significance is? I know that the new bearings have part numbers that end in 39 and 40. Was there a supercession of bearings at some point, even after the recall period?
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Discussing Rod Bearings in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)