I wrote a couple of weeks ago that I was looking at an engine swap because I thought I might have dropped a lock washer into the air intake on my LJ78. When I put it back together and started it, after about 60 seconds it started a loud knock. I am just guessing about the washer. My mechanic has been looking at it and here is what he has found so far. He doesn't know the engine so I'm looking for advice.
1. He ran a scope down the intake but there was so much carbon he couldn't see anything. Good news he didn't see anything obviously wrong.
2. Removed the valve covers and inspected and found no problem there. He couldn't get his scope inside the head because of the ports.
3. Dropped the oil pan to look for metal in the oil. Found zero chunks or shavings. He did find pieces of hard carbon.
4. Next I'm asking him to pull the head and inspect it and the springs.
So I'm eager for advice. I'm encouraged that there are no fragments of metal in the oil. It ran for a good five minutes after starting to knock sonic pretty sure there would be metal in the oil if it ate a washer. He is convinced that the sound is coming from the upper end. It's a definite knock, not just a tapping. It's an ugly noise.
What should I have him look for? Where is the best source for a new head of I need one, or just the head bolts, gasket, etc. If I dont need a new head? What else should be done while he has it apart? What's with all of that carbon?
Thanks for any help guys. I'm in southeast Florida and there doesn't seem to be a lot of Toyota Diesel knowledge residing in these parts!
1. He ran a scope down the intake but there was so much carbon he couldn't see anything. Good news he didn't see anything obviously wrong.
2. Removed the valve covers and inspected and found no problem there. He couldn't get his scope inside the head because of the ports.
3. Dropped the oil pan to look for metal in the oil. Found zero chunks or shavings. He did find pieces of hard carbon.
4. Next I'm asking him to pull the head and inspect it and the springs.
So I'm eager for advice. I'm encouraged that there are no fragments of metal in the oil. It ran for a good five minutes after starting to knock sonic pretty sure there would be metal in the oil if it ate a washer. He is convinced that the sound is coming from the upper end. It's a definite knock, not just a tapping. It's an ugly noise.
What should I have him look for? Where is the best source for a new head of I need one, or just the head bolts, gasket, etc. If I dont need a new head? What else should be done while he has it apart? What's with all of that carbon?
Thanks for any help guys. I'm in southeast Florida and there doesn't seem to be a lot of Toyota Diesel knowledge residing in these parts!