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im here guru of all things mechanical (archive)

[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]

Posted by Angus on June 08, 2000 at 00:54:55:

In Reply to: RE:Noise at start up posted by Big J on June 07, 2000 at 08:15:02:

: 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)

to start with jefrem's posts is very good advice as any backwards movement of the engine will aggravate this problem as is just having the nose of the car uphill when parked will cause this to happen, has to do with the oil draining out of the #1 main journal on the crankshaft and as this is where the oil pressure feed is for the tensioner the tensoiner will bleed down too,made worse of course by any pressure exerted on the tensioner rail by the timing chain be it due to the car rolling backwards in gear or the motor turning backwards due to residual compression or cam location when engine stops(yes the motor will turn slowly backward if the cam stops on the backside of a lobe as these motors have high lift cams).
as far as your problem BigJ i dont think the timing chain should be a problem with so few miles on the engine(see note at bottom)(but thats all subjective to maintenance and use,run at redline all the time , radical cams and the chain will wear faster)you probably just got a bad tensioner .they are an extremly precision fit and are only sold as a matched set (piston and housing)and parts should not be mixed between tensioner assemblies.have the dealer replace the tensioner assembly and look at chain(possibly check condition of upper guide rail and adjust).also have them check the warm oil pressure to make sure there isnt a bearing problem causing low oil pressure.
are you sure there is only 55k on motor do chassis and engine #'s match,amazing thing's happen in the world of used cars

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