Going in for the big surgery tomorrow.. rod bearings replacement - BMW M5 Forum and M6 Forums

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Old 23rd January 2013, 03:26   #1
CarbonHan
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Going in for the big surgery tomorrow.. rod bearings replacement

This is it. My beast has accumulated 128k miles recently and on a cold start i'm hearing what sounds like rod knock. ONLY on a cold start though. I've heard it before many many times but every time i would pop the hood to listen it sounded like it was my vanos. I cold started my car while it was parked next to a wall when i was leaving work and i heard the noise again but this time it sounded like the sound was coming from underneath my car. After a little bit the sound disappeared. When i got home i pulled into my garage and revved slowly but i couldn't hear any knocking.

Is it possible to have intermittent rod knock????? I always thought that once rod knock was present, it was always there.


Anyways, I'm scheduled to take the beast in tomorrow after work to get the rod bearings replaced. Qais over at South Bay Autohaus is the specialist i'm entrusting with the work. South Bay Autohaus - Hawthorne, CA
I was going to spend the money i've been saving on a super charger but i figure that a super charger kit is pretty useless without the car. I'll keep you guys posted.
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Old 23rd January 2013, 03:39   #2
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Quote:
Originally Posted by CarbonHan View Post
I was going to spend the money i've been saving on a super charger but i figure that a super charger kit is pretty useless without the car. I'll keep you guys posted.
Yupppppp. Dont ya hate when that happens
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Old 23rd January 2013, 04:00   #3
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Never heard a rod knock go away when warm, I have heard piston slap on cold start go away when warm and noise from a collapsed lifter when cold go away when warm.
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Old 23rd January 2013, 07:01   #4
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Probably good preventative maintenance anyway, consider changing the rod bolts for ARP fasteners if you like as well.
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Old 23rd January 2013, 07:04   #5
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There's nothing wrong with throwing parts, PMs at a car you wish to maintain, but have you gotten any second opinion on the diagnosis? Do you have a sound clip??
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Old 23rd January 2013, 07:28   #6
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Best of luck and please post pics of the bearings to see how much wear they have @ 128 K

Last edited by bmwMcrzy; 23rd January 2013 at 07:32. Reason: typo
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Old 23rd January 2013, 07:29   #7
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This is getting out of hand with scare of rod bearing failure.People hear a slight knock and panic,it must be the vanos making that sound.I would not crack that motor up unless your for sure it's rod bearing failure!!
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Old 23rd January 2013, 07:44   #8
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Quote:
Originally Posted by bimmerule View Post
There's nothing wrong with throwing parts, PMs at a car you wish to maintain, but have you gotten any second opinion on the diagnosis? Do you have a sound clip??
no sound clip but i'll definitely get one tmrw when i leave work.

The plan is to drop off my car tomorrow night at the shop and have Qais check for rod knock thursday morning along with everything else i want him to. Even if he finds that my rod bearings are fine im going to have him change them anyways.


EDIT: I took a sound clip after work today. Sorry for the bad quality.

Last edited by CarbonHan; 24th January 2013 at 05:32.
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Old 23rd January 2013, 07:52   #9
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Quote:
Originally Posted by lugnuts View Post
Never heard a rod knock go away when warm, I have heard piston slap on cold start go away when warm and noise from a collapsed lifter when cold go away when warm.

i didn't know what piston slap was until you mentioned it. I saw a couple of videos on youtube featuring 'piston slaps' in GM cars and the noise i hear from my car on a cold start doesn't sound like that. I guess i'll find out once and for all tomorrow where all my engine noise is coming from.
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Old 23rd January 2013, 08:00   #10
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Quote:
Originally Posted by Themightyzeus View Post
This is getting out of hand with scare of rod bearing failure.People hear a slight knock and panic,it must be the vanos making that sound.I would not crack that motor up unless your for sure it's rod bearing failure!!

at 128k miles and a super charger in the near future i'm glad to have found a specialist i can trust to change out my rod bearings. When people super charge their beast they usually spend a significant amount of money on 2 additional items:

1) BBK
2) Clutch/FW


Im just adding a third:

3) Rod Bearings.

And i've been on this board since 08. If YOU think you've read too many rod knock threads imagine what i've been going through the past 4 and a half years

Last edited by CarbonHan; 23rd January 2013 at 08:03.
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