Posted by d9gdon on January 13, 2013 at 10:11:39 from (76.1.99.192):
Mr. Lee said: (quoted from post at 21:20:54 06/29/11) Anybody got any ideas on a bent pushrod,scored and slightly bent inlet valve on a 3204 eng? The piston and connecting rod appear to have no play, the valves were WAY overdue on adjustment and have ALOT of clearence, Machine is a '89 Cat D4-C---RJ007544
I know this thread is old, but I ran across it while searching for the valve lash on a 3204 Cat that I'm working on now.
I just repaired a 3406 Cat engine that did this same thing. The end diagnosis was that the head had an old crack in it between the valves and it was determined that coolant would leak into the combustion chamber after a workday and after having sat for a couple of days, it rusted the valve stem causing it to hang up temporarily which let the push rod fall out of position on the stroke causing it to bend when the piston came up and knocked the valve back up. At least it usually doesn't bend the valve since it's positioned in the head vertically instead of angled like some engines.
Maybe this will help someone in the future.
This post was edited by d9gdon at 10:13:03 01/13/13.
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