After I pulled out the tensioner when my engine was torn down for a bottom end rebuild I examined it closely. It was a Rolon piston/shoe that I’d installed 23k miles ago. It actually survived pretty well. Minimal wear, no separation. However I looked for the oiling port though the shoe and couldn’t find it.
It was present on the casting, present inside the piston, but missing from the rubber face. After some scrubbing and cleaning and poking I finally found that it had become gummed up. Either from oil sludge or sloughed off rubber. The conical filter was in place and had no debris. Is this common?
I have a new Renold part to install in it’s place when the block comes back. It has the same sized oil port. I was considering over boring that hole in just the rubber slightly in hopes it would be less likely to clog again. Does this seem reasonable/sensible? I can’t see that altering oil pressure at all.