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chrs1961815 · 08-04-2021, 02:55 PM

If what you discovered is not the knock, then I would say it is time to pull the engine and disassemble it to find out what is going on. Sounds like it is in need of a rebuild at least partially.

If the cylinders and crank aren't scored up and can be lightly polished to a good finish, you are lucky and it will cost far less! As for your valves, the tight clearances usually don't cause a very loud knock. I haven't seen it. Those are all over the place though so you do want to adjust them and get them all to what they should be. The original style valves have to be pulled out and the end has to be ground for clearance. So you have to do it very carefully and probably have to take them in and out.

08-04-2021, 02:55 PM	#30
chrs1961815 Senior Member Join Date: Jul 2018 Location: Spring Grove, Illinois Posts: 1,371	Re: Help diagnosing engine knock If what you discovered is not the knock, then I would say it is time to pull the engine and disassemble it to find out what is going on. Sounds like it is in need of a rebuild at least partially. If the cylinders and crank aren't scored up and can be lightly polished to a good finish, you are lucky and it will cost far less! As for your valves, the tight clearances usually don't cause a very loud knock. I haven't seen it. Those are all over the place though so you do want to adjust them and get them all to what they should be. The original style valves have to be pulled out and the end has to be ground for clearance. So you have to do it very carefully and probably have to take them in and out. __________________ "The more things change, the more they stay the same." Last edited by chrs1961815; 08-04-2021 at 03:01 PM.