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Dr. Hamman
Dr. Hamman, Technician
Category: Classic Car
Satisfied Customers: 2436
Experience:  I have 30 years experience repairing, restoring, and customizing cars, and pickup trucks.
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I have a 1991 740 non turbo 2.3 with valve train knocking

Customer Question

hello, I have a 1991 740 non turbo 2.3 with valve train knocking noise,checked cam and valve clearance, replaced cam and lifter shells, adjusted clearences to proper specs. still have similar noises! can you help?
Submitted: 9 months ago.
Category: Classic Car
Expert:  Joseph Book replied 9 months ago.

Good Morning,

For me to understand what is going on I have a few questions to help me assist you.

Is this a recent issue with the engine or a continual problem?

Was the cam and lifters replaced due to this noise?

The noise does it change tone, or speed with the engine speed?

Does it make the noise all the time or just when hot, cold, or under a load?

Customer: replied 9 months ago.
this is a noise that has gotten worse over time, noisiest when cold , top end for sure, cam, lifters.adjustment washers, all replaced ,clearences correct,seems to diminish at 2400rpms.
Expert:  Joseph Book replied 9 months ago.

Some times blown exhaust gaskets manifold gaskets can mimic lifter noise. Have you checked to the gaskets to see if there are signs of an exhaust leak?