justin_o_guy2
Serious Thumper
Offline
What happened?
Posts: 55279
East Texas, 1/2 dallas/la.
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As for the oil, you are already on that, a few quick changes & get the crappy stuff flushed out. That parts easy. About that knock. I dont see how this would help find it, but I would do it just for giggles. I would hook up an inductive trigger timing light & see at what part of the cycle does the knock happen. If its not at the same time as the light flashes, then the piston isnt at compression or exhaust. So, If you knew that, what would you knw? Hekk, I dunno..
The test you did, pushing down on the piston after it started back down. That might work out, IF the slack in the bearings was so loose that the friction of the rings would pull it up, but if the bearing is just "Less than healthy", thers no guarantee that the slack in it would be revealed by the friction of the rings in the cylinder.( IMO, I may be off by miles here)
If you pull the timing cover & just crank it over with a wrench or ratchet, whatever, can you feel the knock? If you pull the plug & hit the starter, can you hear it? What about pulling the plugwire & pulling the decomp cable to engage the decomp & hit the starter with the plug in?
I've heard of guys dropping rice down the intake of a car that they thought might be carboned up. Sure would be a lousy deal to get more in than it could swallow & wind up having to pilaff the head to get the glue out.
If you think ther might be a busted ring in the mix, maybe a borescope to see the cylinder walls is in order? I think they are expensive, maybe its possible to rent one. I have a magnetic oil drain plug, but havent done the whole Old Feller magnetic treatment to the oil pathway. I do run a pretty stout magnet thru the oil I drain out. If you think there is metal floating around, maybe pulling the clutch cover again & cleaning & checking with a magnet would be an idea? Would a compression check do you any good at all? Unless its low, I dont see how it would do you much good. It could be fine & you still have a busted ring, right?
Good luck, I wish I could have been more help
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