Hitting on all eight cylinders
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Last Active: 4 Years Ago
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OK, I lost oil pressure to the right head valve adjusters after a complete rebuild and about 500 miles of run in. Resulting in a complete teardown to find the issue. The recommendations are that the cam bearing was too soft due to the manufactures recent material changes resulting on the bearing closing (mushrooming) in on the small slot in the bearing that allowed the oil to flow. The exerts recommend that I use the cam bearings from SCHUMANNS SALES AND SERVICE with an external groove around the exterior of the cam bearing. This will eliminate the need for the oil to penetrate the small slot in the bearing travel around the smaller slot in the cam and exit to the again small slot in the cam earing to either the right or left head passages which allow the oil to lubricate the valve adjuster assemblies. Solving my issue.
My first question is what will happen if I simply replace the existing cam bearings with cam bearings from Schumann's sales and service and their external groove around the exterior of the cam bearing, or run a drill down the 1/4 " hole in the block to the cam bearings and opening up that small slot in the cam bearings? Or take the cam groove on the existing cam journal and open it up with (forgive me) a chain saw file to 0.60 deep? Yes it fits. Or what if I do all three. purchase the SCHMANNS Sales and Service cam bearings with the external groove, drill the 1/4 " opening in the cam bearings existing small slot and file the existing small groove on the current cams? Am I playing with fire? I simply don't want to rip the engine out after another 500 miles and rebuild it for the 3rd time????????
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