techmitch
Well-Known Member
- May 1, 2008
- 8,396
- Boat Info
- 1999 270 DA
- Engines
- Twin 4.3s W/Alpa I Gen II's
The correct use of a good leak down tester will tell you where the leak/loss of compression is going.I was getting zero pressure in the #7 cylinder when I was testing all the cylinders. It had 150 according to my notes before the rebuild. I know the cylinder walls and the piston looked free of damage when it was apart so its not likely the piston or rings that failed. I loosened the rocker arms to make sure both valves were still closed and the cylinder still would hold zero pressure. Unless the piston failed after assembly which I would expect more noise and symptoms if it had. The only thing I can think of is I somehow screwed up the head gasket and the pressure is leaking out the gasket. Either way I'll only know for sure once I tear the whole thing down again. Also either way this boat is becoming exhausting both physically and financially with just trying to get it to run. I really don't want to be doing this myself but I still can't find a single mechanic willing to work on it for me. All the ones I trust here either are too busy or now say they refuse to work on gasoline engines and will only work on diesel.