| Found engine knock [message #250125] |
Mon, 19 May 2014 15:02  |
Francois
Messages: 161
Registered: October 2012
Location: Southern California
Karma:
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The other day my perfect running 66,000 mi. 403 MH started running really badly with backfires and a loud knock.
Noticing that the knock seemed to be not in sync with the crankshaft but less regular, I started by taking off the valve covers. On the right side, there it was, about a half inch of space between a rocker arm and a pushrod. The rocker arm was tight, and the valve spring was intact and all the way up. So I started the process of removing the carb and the intake manifold.
I am, of course, hoping that it is a blown lifter. I figure, if it is, I'll replace them all and rebuild the carb while it's out. I am pretty sure I will have the answer by next weekend.
Does anyone have any comments on what I should look for? I would appreciate it.
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