jag530isport

BMW E39 M5 Rod Bearing & Chain Guides

8 posts in this topic

Hi guys

 

I'm thinking about getting my Rod Bearings, Chain Guides done on my m5. The car itself has done 86k and I have no issues whatsoever just looking at getting them done more for preventative measure.

 

I spoke to Phil at CPC and he was saying that the cost of the work is roughly just over £3k and we will also look over the vanos while he was there even though I have no vanos issues.

 

Is there anything else I should be getting done while this work is being carried out and for the people that have had this work done did you have any issues afterwards?

 

Thanks

Jag

 

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Edited by jag530isport

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Good call

Did mine last summer (not at cpc) and included to your list.  Chains (main, timing and oil), Guides (all inc oil and timing), Tensioners (vanos and main chain)

I'd get vanos rebuilt with actuator seals and the vanos diaphragm springs taken care of too, whilst you're in there.

 

Hakon

Edited by Hakon

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Bear in mind that it is only a tiny percentage of cars that have had big end failures. £3k is a lot to spend 'just in case'. If you have bits of chain tensioner in your sump or the slightest knock then I'd go ahead but a relatively low mileage car with no issues? I'm not sure I'd be going down that route. Have you addressed all the other E39 problem areas? Suspension bushes/springs/dampers, rust etc? £3k goes a fair way towards sorting out those problems. 

Jameswsb and Carl-e34 like this

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5 minutes ago, kobayashi said:

Bear in mind that it is only a tiny percentage of cars that have had big end failures. £3k is a lot to spend 'just in case'. If you have bits of chain tensioner in your sump or the slightest knock then I'd go ahead but a relatively low mileage car with no issues? I'm not sure I'd be going down that route. Have you addressed all the other E39 problem areas? Suspension bushes/springs/dampers, rust etc? £3k goes a fair way towards sorting out those problems. 

Absolutely spot on. There is a lot of scaremongering on this subject. That's not to say that guides don't break up and rod bearings wont fail eventually but at that mileage I'm not sure I would be lobbing £3k at something which is unlikely be worn unless you have some evidence to the contrary. Just for a bit of context, earlier in the year I had my car in at Darren Wood who ran a vanos test which it failed on bank one and I was advised to rebuild the vanos at £1700. I did some research and replaced the CPS's which sorted the issues for a faction of the cost. The car has since produced some very strong numbers of the dyno and runs like a dream.  Jamie Peers thread on here is worth a read, he did his bearings/guides etc at around 140k miles and they were spot on.

 

Worth sending a sample of the oil for analysis if you are concerned and go from there before pulling the motor and spending a fortune.

Carl-e34 likes this

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Haha, that was assuming all suspension parts had already having been taken care of.

 

Borescope through the oil filler cap can take a look at some of the main guide but I'd certainly get a new main tensioner in, as they slacken and it takes less than 20 minutes.

My guides were replaced at 68k as they were found to have broken tabs  and although not unduly worn, the missing tabs is a potential problem especially with a slack chain.

I had big end bearings actually fail at 32K, thankfully with minimal damage to the crank. Had they not, I'd have probably had them done with the guides at 68k

 

 

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If no knocks or 'funny-noises-not-quite-like-a-knock' then an engine oil analysis (£30) with every oil change will be as good a diagnostic for rod bearing issues as anything. I wouldn't be spending big money on what may well be a sound bottom end.

 

Borescope inspection of the chain guides from down the oil filler: sounds like a good plan! Agree that the main chain tensioner is a cheap and quick DIY that's definitely worth doing

 

How noisy are your VANOS units? If quiet - and not already done - then just replace the 'O' rings on the solenoids, clean up and check for dry solder joints. (If your solenoid 'O' rings are on the way out you'll notice oil weeps/leaks from the front covers.)

 

You could be unlucky and have multiple problems with rod bearing/chain guides/VANOS at low mileage but remember most won't have these issues. There's several E39 M5s running around in the US with 250k+ miles which have experienced none of the above issues and the cars have had nothing but regular though careful servicing.

 

Everyone has their own theory about why the S62 engine can experience these problems. My two cents is that some cars during their lives will have been mercilessly ragged when cold, or thrashed to the red line with every gear change when hot, or not been serviced correctly. The nightmare scenario is a toxic combination of all of these. The car is then passed on to a careful owner who picks up the tab for all the early abuse. Tell me I'm wrong!

(I have to say that rod bearing knock at 32k miles is really unlucky though!)

Rosie likes this

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Considering the timing chain guides and rod bearing are the only real documented killers of an S62, I'd change them out proactively IF the car is a keeper.

 

If its not a keeper then forget it, but make sure neither fail within your tenure, at which point the £3K will start looking like a very low insurance premium that you didn't pay.

 

If you buy a used replacement S62 in the event your original one failed, then you'd be doing the rod bearings and timing chain guides on the replacement engine in any event anyway, I'd assume.

Hakon likes this

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Thanks guys I've been thinking about this for a while to be honest. The car is a keeper I won't be getting rid of it so I'm thinking that it's probably easier to spend the £3k now and at least I'll have the piece of mind that it's done.

 

 

 

 

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