help: positive crankcase pressure, oil problem
help: positive crankcase pressure, oil problem I have a 6.2 in an old car. I have a carburetor on it. Long story short the engine caught fire and i put it out with a hose, so some water got into the carburetor. i hadn't touched the car in over a year so i replaced the damaged wiring, cleaned the carburetor and changed the oil. When i went to start it it lugged pretty hard, like it was hydrolocked almost, but after a few revolutions it was turning over like normal. i fired it up and it seemed to run fine. the problem is oil squirts out of my front facing breather (passenger side) when i rev it hard. when i take off the plug i have on the driver's side valve cover, i feel it pushing air out. could my rings be bad from this?
I am thinking of doing a compression and leak down test now.
I am thinking of doing a compression and leak down test now.
Yeah.. sound like the ring have failed or stuck in the Ring grooves. You said you put the fire out with a hose/water.. maybe the water sat in the cylinder and rusted the ring or valves (seals/valve guides) some. It might get better once the engine gets a little time on it again. Try some Marvel Mystery Oil in the crank case.
How is the Oil pressure ?
Yeah, Do the compression and/or Leak down test.. Good luck.
BC
How is the Oil pressure ?
Yeah, Do the compression and/or Leak down test.. Good luck.
BC
You can try pulling the plugs, pump some marvel mystery oil into the cylinders then turn it over a few cranks. Probably should have been done before the restart but oh well.
Hopefully you replaced the oil and filter before the restart also.
I agree with bczee, but would add you might have damaged a head gasket. At either rate the tests should tell.
Hopefully you replaced the oil and filter before the restart also.
I agree with bczee, but would add you might have damaged a head gasket. At either rate the tests should tell.
Yes i changed the oil and filter. I am running MMO in it.
I finally got around to doing a compression test. The average of the seven "normal"cylinders is 211 psi. The "problem" cylinder is 178 psi. Roughly 84% of the average reading. The next lowest was 200 psi...
I used a bore scope and everything looks fine in that cylinder. No rust on the walls.
I flycut the pistons in this engine, so since all the cylinders are not cut exactly the same, the compression will all be a little different. I was just a little surprised the one cylinder was under 180 psi compared to the others.
Any thoughts feel free to comment
I finally got around to doing a compression test. The average of the seven "normal"cylinders is 211 psi. The "problem" cylinder is 178 psi. Roughly 84% of the average reading. The next lowest was 200 psi...
I used a bore scope and everything looks fine in that cylinder. No rust on the walls.
I flycut the pistons in this engine, so since all the cylinders are not cut exactly the same, the compression will all be a little different. I was just a little surprised the one cylinder was under 180 psi compared to the others.
Any thoughts feel free to comment
I have one and i just need to buy a new hose for the compressor.
The motor ran fine and ran mid 10s before it sat for 2 years. There were no errors in flycutting. It's just that it was done at home in a garage with a feeler gauge.
