Question about 2003 Harley Davidson FXSTD Softail Deuce

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Have a knocking that is happening in the rear cylinder...was wondering what would cause that... and also how much it would roughly cost to fix the problem.

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Depends on what the problem is as to how much it will cost to fix it.
There are any number of things that could cause this problem. Since I'm not there to hear the noise, I'll just tell you what they are.

You could have a bad roller on a tappet. These seem to be a weak point on Harley Big Twins. However, the Twin Cam engine was designed to help minimize this problem by partially correcting the problem with poor valve train geometry that the Big Twins always suffered from. Look at the pushrod tubes on an Evo engine and Sportster engine. The Sportster has perfect valve train geometry where the Evo is all messed up. But, still the roller tappets on even the Twin Cams give problems. When this happens, they get an excessive amount of valve lash and the result is a very loud tapping in the head of the effected cylinder. Usually this takes out the cam/cams as well.

You could have lost a piston pin. This is highly unusual since Harley went to the standard piston pin locks instead of the spiral lock of years ago. Still it could have happened.

There are also a few other things that could have happened. A valve spring could have broken, or a valve keeper may have jumped out. It's difficult to tell without actually going into the engine.

Whatever it is, I hope it's not too bad.

Good luck
Steve

Posted on Jul 11, 2010

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