Gold Lifetime Member
Join Date: Oct 1999
Location: Alamogordo, NM, USA
I know this is probably next to impossible to diagnose here, but what the hell...
During the cold months, after several seconds of running after start up, my 83 L69 knocks. Sounds deep within, like maybe a rod knock. It goes away after less than a minute of run time. I never hear it again till maybe the next morning. It doesn't always do it. I can envision it being oil related. If the oil is cold, it takes a while to get to the bearings, etc...
But get this, a couple of years ago, I disassembled the engine strictly for a gasket change-out, (big time leaks). I was having the knocking problem then too. I didn't find one thing wrong with the engine. Bearings were in good shape, normal wear on the cam, and I could still see remnants of the cylinder wall cross hatch pattern. Not bad for a 130,000 mile engine. Not wanting to break the ring seal, I left the pistons installed, and decided to change the main and
rod bearings, timing chain and sprockets, and gaskets. The noise is still there.
Maybe it's not engine related?
I never have a bit of trouble with the engine otherwise.
Go figure!! Who wants to take a shot?