Posted by Steve@Advance on September 02, 2022 at 21:05:44 from (99.190.215.237):
In Reply to: Farmall c knocking? posted by Zsprankle on September 02, 2022 at 18:26:35:
Sounds like it has plenty of oil pressure. Very normal to have low pressure at idle. If there is any needle movement at all at idle it will last a long time.
Something you can do, with it at idle, warmed up and knocking, pull one plug wire at a time, listen for a change. If the knock stops, chances are it's a loose piston or wrist pin. If it becomes a double wrap, suspect a rod bearing (but I doubt that since it still had oil pressure). Piston/wrist pin noise can go for years without causing problems.
If there is no change, it could be valve train noise (the valves should be readjusted anyway when they have been apart). It could also be a loose front pulley or a chipped tooth on the cam/crank gear. Also try a start up with the fan belt removed.
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