DOMINIC
Active Member
FIXED FIXED FIXED AND FIXED! I am sorry but it took me so long to get back on this engine. Due to the midwest freeze, my shop has been very busy. This is where I left off. I said I would perform a compression and leak down test as well as valve lash. Valves were perfect and leakdown was perfect at 2/4%. Cranking compression test,,not so good. It dropped to 130/135psi. I asked myself why was my compression evenly dropping across the board? Mechanical timing. I removed the timing cover and there was the timing chain,just dangl'n there. More than 12degrees in all. I called Lamaar W. to ask him why this chain would have stretched so quickly. He told me to remove the chain and inspect the block behind the cam gear for any signs of wear. I did. The cam gear was rubbing on the block. He said he use to sell this chain years ago but they were such a piece of crap, that he never sold them again. He sent me a chain set that he sells that works well with his stock cam grinds. The crank gear has 7 positions. I ended up installing the crank at 4 degrees adv. which gave me a cranking compression of 185 psi. I took your advise out there and cleaned out the block at the waterpump passages and put it all back together with the original pump. Started it up,set base timing at 18 degrees and whoola,,,,,it ran at 175 degrees for about 30 minutes.
Conclusion, when I disassembled the original rebuilt engine, the timing chain was falling off. When I Re-rebuilt the engine,, I ended up receiving and installing the same identical new timng chain set. What caused both chains to stretch was most likely poor quality metals and a cam gear that was not manufactured properly. The cam gear was rubbing against the block causing excessive heat, which in-turn caused the chain to stretch. This my friends was indeed where the problem first began! As my opening message states,,"It's never just one problem" Please feel free to ask away with any questions. I tried really hard to keep this post short. And P.S.,,,Ronnie Russell,,you were right! sincerely,,Dominic
Conclusion, when I disassembled the original rebuilt engine, the timing chain was falling off. When I Re-rebuilt the engine,, I ended up receiving and installing the same identical new timng chain set. What caused both chains to stretch was most likely poor quality metals and a cam gear that was not manufactured properly. The cam gear was rubbing against the block causing excessive heat, which in-turn caused the chain to stretch. This my friends was indeed where the problem first began! As my opening message states,,"It's never just one problem" Please feel free to ask away with any questions. I tried really hard to keep this post short. And P.S.,,,Ronnie Russell,,you were right! sincerely,,Dominic
good for you and a great bunch of detectives we have here as well.
Ray,a grouch???????NO ,it's just a lack of enthusium due to this terrible winter we've been going through.
I also have respect for what Lamar has done,and as has been said,when he speaks,I listen,but the most important difference is that Lamar is also trying to SELL someone something,whereas the people here are trying to HELP someone else.Just the way I see it.
Leo