Question about 1995 Buick Riviera
Noise is at idle goes away at about 1200 rpm. Replaced lower tensioner, idler pulley and both serp. belts. Noise does not seem to affect performance at all (good mpg, acceleration, etc.) but is very annoying (like a deisel motor). How much rotational play should there be on the crank pulley? What could this noise be?
Remove the supercharger belt... check for play in the supercharger pulley... there is a plastic coupler that connects drive from the supercharger cone to the main body of the supercharger... these wear out ... it is a problem on both the series 1 (1995) and series 2 (96-99) supercharged 3800 engines
Posted on Jun 27, 2010
It is most likely the harmonic balancer car is well known for this problem
Posted on Oct 24, 2011
Could be the oil pump it’s located behind the harmonic balancer on the 3.8 and when its out of tolerance it make a rattling noise. The 3.8 Buick harmonic balancer requires a special puller. But, if you purchase three 4" long, 6mm diameter, 0.1 thread bolts and three heavy duty washers you can use a standard 3 hole puller to remove the balancer. The threaded holes for the 6mm bolts are about 2" inside the access openings that are located on the face of the balancer. You will need to place the heavy duty washers on the 6mm bolts before they are used with the puller. The hex heads on the bolts are to small for the standard type puller and the washers will support the torque required to remove the balancer. The puller must be the type that allows an extension rod to be added to the center bolt of the puller. This extension is needed because the center bolt of the puller is to large in diameter and it is not long enough to reach the back of the through hole on the crank shaft. (it is drilled very deep). Cost about $2.50, This beats paying over $150.00 for the suggested factory puller.
Posted on Mar 12, 2010
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Posted on Jan 02, 2017
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