Question about 2006 Harley Davidson FXDBI Street Bob
A knocking on the right side of the engine is usually caused by a bad tappet roller bearing. In the Evo engines, they seemed to go bad at about 25 to 30 thousand miles. I have seen them go bad in as little as 13K miles. Then, I've seen them running fine in an engine with 75K miles on it.
Now, tappet roller bearing noise is usually there throughout the entire RPM range and is not affected by the gear. The only way I know of checking it do exploratory surgery, take the cam cover off and pull the tappet blocks out to inspect the tappets. If you allow this to continue and it is a bad roller, it will ruin the camshaft lobe that it's riding on. I've seen them no do any damage to the cam if caught early.
Posted on May 30, 2010
Testimonial: "Thanks that was a pretty detaialed diagnoses. After further investagation it actually sounds more like a ticking sound "
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Posted on Jan 02, 2017
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