Bad oil leak under intake manifold

[lostforawhile]

K. So just did a compression check. 180, 150, 150.... 30. Seems like I have a bigger issue.

that doesn't mean you have bad rings, you need to do a wet compression check, that means put a teaspoon of oil in the bad cylinder, and do the test again, if it doesn't change,the issue is in the head, you could have a burned valve or a crack in the head etc, the two middle ones both being low also could indicate this, possibly a crack between cylinders in the head.

[Lead Foot]

That's more where I was leaning. I would think all the rings would be bad. The other cylinders have good compression. Hole in the piston? Maybe the idiot before me dropped a bolt in the cylinder? But I would think it would smoke more just cruising around, not only when climbing hills... What about an extremely bad valve guide or seal? I honestly didn't examin the valves when we changed the gasket. maybe a broken valve spring and a dropped valve?...

[Lead Foot]

Well a dropped valve would explain compression but not the oil huh? Also using a Gauge with the rubber cone and not a thread in. So middle two could just not have sealed all the way on the gauge. Chances on only 1 valve being burnt? I thought they all would burn, just like rings?

[Lead Foot]

Btw. The dead cylinder is closest to the passenger side. Spark plug was deep brown but not wet. Others were quite lighter.

[lostforawhile]

Well a dropped valve would explain compression but not the oil huh? Also using a Gauge with the rubber cone and not a thread in. So middle two could just not have sealed all the way on the gauge. Chances on only 1 valve being burnt? I thought they all would burn, just like rings?

sure one valve could be cracked, or burned, if you had something like a cracked valve guide, or a crack in the head that also would explain the oil, don't condemn the rest of the engine until you know for sure