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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 07-15-2006, 08:57 PM   #1
manydubs
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Timing chain replacement interval???

I come from the 4 cylinder VW family and have serviced my cars' timing belts at regular intervals. However I now have a BMW 323i and was asked by a potential buyer about the timing chain.

My Q is: Is there a point or mileage where the timing chain needs replacement?

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Joe
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Old 07-15-2006, 09:13 PM   #2
TravsM3
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I thought since it's a chain it doesn't really need to be changed vs. a belt.
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Old 07-15-2006, 09:40 PM   #3
paraklas
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Timing chain is supposed to be there for the entire service life of the engine
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Old 07-18-2006, 09:10 AM   #4
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A long serving BMW tech guy told me once that he had never seen or heard of a case where a timing chain had failed - ever !

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Old 07-18-2006, 10:46 AM   #5
Mikola200
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as E46's generation gets older we might see a few failures. I believe it is supposed to be checked and tightened once in a blue moon, smth like 150k miles or so.
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Old 07-18-2006, 12:46 PM   #6
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BMW timing chains can fail but at what most people would consider extreme mileage (250k to 400k miles). I broke one in an old track car at 249k miles.
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Old 07-18-2006, 12:47 PM   #7
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Quote:
Originally Posted by Mikola200
as E46's generation gets older we might see a few failures. I believe it is supposed to be checked and tightened once in a blue moon, smth like 150k miles or so.

BMW uses spring loaded and/or hydraulic tensioners in just about everything with a timing chain. There is no adjustment possible.
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Old 07-19-2006, 01:40 PM   #8
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The issue with chains is they can stretch over time and affect cam timing.

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Old 07-19-2006, 03:49 PM   #9
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sometimes the tensioner can fail, it's a good idea to check for play around the 100k mark just to be safe. At around 100k miles, the valve cover gasket on most of our engines are weeping a little oil, so it's a good time to bring it into a shop and see how it all looks while the valve cover is off.
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