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Re: RE:Noise at start up (archive)

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Posted by CFL on June 07, 2000 at 09:17:00:

In Reply to: Re: RE:Noise at start up posted by jefrem on June 07, 2000 at 08:52:04:

: : I own a beautiful '91 red M3 convertible. I've only had it a few days and it is making a 'diesel' noise on start up. It only has 55k miles on it. Is this not a little early in the engines life to be showing signs of wear?? Could the timing chain be worn that much already? There is no noise from the chain after this initial rattle. Could it possibly be anything else?
: : I'm going to get the dealer I bought the car from to change the tensioner anyway but if it could be anything else I can get them to look at that as well.
: : Cheers...... (Angus I'm hoping to hear from you)

: Try this:

: When shutting-off the engine, do so with the clutch disengaged (i.e. the pedal pressed-in), and the tranny in neutral. Secure the car with the parking brake, then let-out the clutch. If you're on a downhill slope (the nose lower than the rear of the car), you can engage 1st gear for extra security -- if uphill, you can engage reverse.

: There seems to be a particular sensitivity of the hydraulic tensioner to even a tiny bit of reverse rotation of the driveshaft, such as can occur when shutting off the motor on even the slightest incline. When I follow the above procedure, I never get the "diesel" noise -- try it yourself, and let us know.

: BTW, I did not invent this -- credit should go to Dr. Elihu Savad (sp?) for noticing that the above procedure seems to eliminate the problem.

: Cheers,
: -jefrem

Mine does the 'diesel' thing when I swap tires. Apparently jacking up the car is enough to cause that chain noise on mine. Pain in the butt.

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