Looks like I will be pulling the head on my '93 80 in October or November to replace the valve guide seals. Burning about a quart every 500 miles. Oil leaks are minimal. Spark plugs only have a few thousand miles but wet oil on them. I also did a leak down test (first I've done). The results seem reasonable, though a few cylinders leaked out the intake.
Any recommendations for a good machine shop near Knoxville to do the head work?
Leak down test results:
Cyl. Psi in. Psi cyl
1. 80. 70
2. 80. 70
3. 80. 72
4. 80. 65
5. 80. 69
6. 80. 69
I read 20% leak is considered normal. 25% excessive. Leaks were out crank case (seemed normal, all seemed the same, and some also leaked out intake (so leaking intake valves I assume). No bubbles in coolant and none seemed to leak out exhaust.
Any recommendations for a good machine shop near Knoxville to do the head work?
Leak down test results:
Cyl. Psi in. Psi cyl
1. 80. 70
2. 80. 70
3. 80. 72
4. 80. 65
5. 80. 69
6. 80. 69
I read 20% leak is considered normal. 25% excessive. Leaks were out crank case (seemed normal, all seemed the same, and some also leaked out intake (so leaking intake valves I assume). No bubbles in coolant and none seemed to leak out exhaust.