Question about 2004 Harley Davidson FXDWG - FXDWGI Dyna Wide Glide
Hi, My first guess would be that you lost the roller bearing on the end of a tappet. I've heard those things knock so loudly that it sounded like something on top of the piston. These rollers are a weak spot in the Harley engine design in my opinion. I've seen them go bad in as little as 13,000 miles. But, I've also seen original tappets running in an engine with 75,000 miles on it. Usually, if they are going to give trouble, it occurs at about 25-30 thousand miles. They are especially prone to failure if an aftermarket high performance camshaft has been installed in the engine.
The problem is that the damage is not limited to just the tappet. It always destroys the camshaft. The lobe that the roller runs on is always scarred up badly. I've seen it cause a valve to get bent as well. If this is the problem, count on pulling the rocker boxes, the tappet blocks, and the gear case cover (nosecone), and possibly the heads.
Posted on Oct 05, 2010
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Posted on Jan 02, 2017
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