Rock the crankshaft back and forth to see if you can hear or feel the clunk. Try it with the crankshaft rotated to several different positions. If you can hear or feel it you may have to drop the pan to see if you can locate the problem.
One possibility is a spun rod bearing. If one of the bearing shells spins so that it is on top of the other one the engine can be quiet when they are on the bottom of the rod cap but will cause the piston to hit the head if they are on the top of the rod.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
... [Read Article]
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