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E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}


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Old Sat, Apr-21-2018, 04:19:28 PM   #1
Al Soobie Guy
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Default 120k Get ready for a timing chain.

Thought i'd share something i recently encountered, second s65 actually.

120k, unabused original rod bearings still half way decent and good oil change history.


I guess a friendly warning to start saving for a job roughly 2k in parts with rod bearings and another ~25 hours in labor



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Old Sat, Apr-21-2018, 09:03:10 PM   #2
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Default Re: 120k Get ready for a timing chain.

That does not look like fun. I may do main bearings as preventative maintenance in a few years, when I will have about 120k. Drop the motor. I’ll repkace the chain and guides and look at the vanos. Did the rod bearings at 60k.
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Old Wed, Jun-13-2018, 08:42:51 AM   #3
marlenjsharpton
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Default Re: 120k Get ready for a timing chain.

A lot of people get confused about the difference between a timing chain and a timing belt.
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Old Mon, Jun-18-2018, 04:16:58 PM   #4
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Default Re: 120k Get ready for a timing chain.

Can you explain more about what happened? What were the symptoms etc?
Otherwise pretty useless warning imo.
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Old Fri, Jun-22-2018, 06:57:34 PM   #5
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Default Re: 120k Get ready for a timing chain.

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Originally Posted by tdott View Post
Can you explain more about what happened? What were the symptoms etc?
Otherwise pretty useless warning imo.
The timing chain guide failed.
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Old Sat, Jun-23-2018, 02:58:58 AM   #6
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Default Re: 120k Get ready for a timing chain.

It’s a big job for preventative maintenance and timing chains on BMW motors are generally very durable. On M3post, the most active E9xM3 forum, timing chain failures are extremely rare. Main bearing failures are more common but still rare. Rod bearing failures are the most common major failure and the only major failure for which preventative maintenance is arguably worthwhile. Other things can go wrong like throttle actuators but they are easily replaced upon failure and cause no engine damage.

I am considering a preventative maintenance main bearing change. I’ll pull the engine and would do the guides and chains as part of the job — it’s major work so you might as well do as much as possible. I did the rod bearings four years ago, but obviously would do them again while in there. Timing the cams would also be a challenge. Never done an S65x
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Old Mon, Jun-25-2018, 05:28:54 PM   #7
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Default Re: 120k Get ready for a timing chain.

My friends timing chain snapped on his 2011 X5d recently. No warnings whatsoever.
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Old Mon, Jun-25-2018, 09:16:07 PM   #8
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Default Re: 120k Get ready for a timing chain.

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Originally Posted by M3_Pilot View Post
My friends timing chain snapped on his 2011 X5d recently. No warnings whatsoever.
I would call that coincidence relative to the S65. Each engine family is different and has its set of issues. I don’t know the diesels at all.
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Old Sun, Jul-08-2018, 04:40:30 AM   #9
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Default Re: 120k Get ready for a timing chain.

That sucks...probably not a very fun job unless you remove the front end clip. I wouldn't consider that a common issue that needs to be preventively addressed.

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Originally Posted by pbonsalb View Post
That does not look like fun. I may do main bearings as preventative maintenance in a few years, when I will have about 120k. Drop the motor. I’ll repkace the chain and guides and look at the vanos. Did the rod bearings at 60k.
Wonder how painful the main bearings are going to be. I believe you have to inject something into the bedplate.
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Old Mon, Aug-13-2018, 09:32:01 PM   #10
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Default Re: 120k Get ready for a timing chain.

Quote:
Originally Posted by bigjae1976 View Post
That sucks...probably not a very fun job unless you remove the front end clip. I wouldn't consider that a common issue that needs to be preventively addressed.



Wonder how painful the main bearings are going to be. I believe you have to inject something into the bedplate.
Remove crank (which requires pulling the VANOS units and breaking timing to get the chain loose), and the injected seal.

If you are breaking timing with a chain job, that's DEFINITELY a time to think hard about doing the mains.
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Discussing 120k Get ready for a timing chain. in the E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) Forum - {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm} at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)