Re: Cam Plate

Posted by Tim Cole On 2015/4/26 6:33:12

There is a bulletin citing lifter noise between 40-45 mph. The revised plate reduced flow to the timing chain. However, I don't think they understood what was going on because this is symptomatic of a cavitation problem. The vacuum pump in the pan may have been causing the problem or air may been being sucked through at the rear main, relief valve, or any of the other places they tried to put band aids on the motor.

Were I in their shoes I would have first tried duplicating the symptom in the lab and start with lighter oils and run some bypass taps to examine the flow with the motor running. If the oil was full of bubbles then work backwards to find the source.