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Re: Longevity of the E34 (archive)

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Posted by Andre on April 14, 1999 at 08:16:25:

In Reply to: Re: Longevity of the E34 posted by Bruce on April 12, 1999 at 11:03:33:

You may not "need" to change the chain, since it rarely breaks and causes that terrible valve / piston kiss, but it DOES stretch and wear. How much depends on the engine, chain, cam, and maintenance, but I have seen cars with 100 - 125K miles have 7-8 degrees of camshaft retard from stretch and wear. That moves the torque curve even higher, hardly desirable in the M50. Changing it will restore the cam to original timing, resulting in better drivability. Note that racers run full double roller chains, and they change the chain & sprockets frequenetlly to avoid this.

Religious 3K oil / filter changes will greatly reduce the wear. The stretch is more a function of time at high RPM, so YMMV.

When I bought my 91 525, I replaced the chain and degreed it before & after replacement. There was 5 degrees difference, and a noticeable driving difference. Previous owner followed the oil change / service lights, and had documentation of same.

:

: I'm interested in knowing what engine you have that you "needed" to change your timing chain every 100k miles. Timing chains don't necessarily wear out every 100k miles. Timing belts, like those found on the 525i engines, need to be changed every 60K miles or so. Let us know. Thanks, Bruce




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