Harley Cam Seal

Q: OK, got a question.. Have a 96 evo.. Has 42 thou on it.. Runs perfect, But.. It blows the Harley cam seal one after another in less than 100 miles. No damage to cam, no leaks otherwise. ??? Been to 5 H-D dealers.. they have no idea.. Got any ideas?? Started blowing cam seals at 35 thou miles.. went for a few thou miles after first fix down to every 100 miles now.

A: We recommend unloading your top end and doing a thorough inspection inside your cam compartment. There are a few things that can cause the problem you are experiencing.

Cam Bearing: inspect your cam bearing. If the bearing is bad. The cam will not be supported correctly. The cam will slightly tip causing the cam seal to fail. If the bearing looks/feels good; replace it anyway. You are all the way there, and a new bearing is cheap. If any needle bearings are missing from the bearing cage, you have another, more serious, problem.

Cam Cover Bushing: Inspect your cam cover bushing. This supports the outside end of the cam. If the bushing is out of spec, this will also allow the cam shaft to tip, or dip. If the bushing is out of spec, replace your cam cover. We recommend HD only for this replacement part.

Pinion Shaft: Use a dial indicator to measure the run out of your pinion shaft. If the run out measurement is out of spec, it may indicate that the pinion gear is causing excessive movement as it runs against the cam gear. Again, causing the cam to tip, and the seal to leak.

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