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Reply to "Troubling sound at back/top of motor"

I pulled the drain plug from the oil pan and it is magnetic.  There was not any trace of metal shavings or metal debris.

I ran the motor and listened with the stethoscope near the valve covers and intake manifold.  The sound seemed to be coming from the valve train for cylinder #4.

Next I pulled the valve cover and inspected preload (pushed and twisted the rockers) and found that the lifter for the intake valve for cylinder #4 was mushy.  I have seen this problem before and in that episode two of the lifters had debris (oil filter element?) in the intake port that prevented the lifters from pumping up.  I ended up replacing the full set of roller lifters.  My next step is to pull in the intake and fix or replace the problematic lifter.

B8F8280E-89DC-4919-8D02-26CAC35DC044

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