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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 Sat, Sep-15-2018, 09:18:51 PM   #1
apeters912
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Default Help, Mid Rod-Bearing DIY, How much play is too much play?

Hello All,

I am currently in the middle of a rod bearing DIY on a 2003 e46 m3 (160k miles). I have been following the links below for reference.

http://www.m3forum.net/m3forum/showthread.php?t=455681
http://www.m3forum.net/m3forum/showthread.php?t=558412

Upon going through the second set of torque-ing on cylinder one, I noticed the new bearing also feels loose, though better than before the bearing was replaced. I imagine this is a sign of engine wear. How much play is too much play? Should I continue with the install? What would you guys recommend? While it isn't ideal is this within tolerance?

https://www.summitracing.com/parts/k...77xp/overview/

See video below:


Perhaps the last round of torque will help.
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Old Sat, Sep-15-2018, 09:53:17 PM   #2
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Default Re: Help, Mid Rod-Bearing DIY, How much play is too much play?

Plasticuage and visual inspect when you remove the cap to plastiguage measurements -0.00031, +0.00031


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Old Sun, Sep-16-2018, 08:36:37 AM   #3
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Default Re: Help, Mid Rod-Bearing DIY, How much play is too much play?

Is that the new bearing clearance hitting the crank or is that a loose endcap on the rod? Last round of torque could help if you have not gone through the final angle torque step, since the bolts yield and elongate.

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Old Mon, Sep-17-2018, 12:40:30 AM   #4
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Default Re: Help, Mid Rod-Bearing DIY, How much play is too much play?

Once the cap is on whether you put 5 or 50ftlb you won't feel a difference. I suspect you might be detecting the axial play but the video is hard to tell. You need to plastigage to tell you what's going on
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Old Mon, Sep-17-2018, 03:01:17 PM   #5
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Default Re: Help, Mid Rod-Bearing DIY, How much play is too much play?

Measure the crank and get the right bearings for your measurement. BMW sells 3 different ones. Yellow, green and red
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Old Mon, Sep-17-2018, 04:54:36 PM   #6
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Default Re: Help, Mid Rod-Bearing DIY, How much play is too much play?

Quote:
Originally Posted by apeters912 View Post
$150 for rod bearings? What's the catch?
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Old Mon, Sep-17-2018, 05:01:45 PM   #7
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Default Re: Help, Mid Rod-Bearing DIY, How much play is too much play?

Plastiguage is cheap and will tell you exactly what your clearance is. The instructions on how to use it are on the package it comes in a lot of different sizes. So get the size thatís going to fit what your specified clearance is. If itís too tight you may have wrong bearings also if itís loose they are either too big or the crank is worn and needs re grinding.


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Old Wed, Sep-19-2018, 11:11:13 AM   #8
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Default Re: Help, Mid Rod-Bearing DIY, How much play is too much play?

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Originally Posted by fastmonbbs View Post
Measure the crank and get the right bearings for your measurement. BMW sells 3 different ones. Yellow, green and red
According to realoem its blue and red for upper and lower
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Discussing Help, Mid Rod-Bearing DIY, How much play is too much play? 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)