Topic: 3.slow valve? found exaust is tight still looking for help?

[lucky7]

Just put a motor in my 4runner and the # 1 cylinder only has 50lbs of compresion.Wondering if the valves could tighten up enough to create this?Any help would be great

[2manytoys]

Yes the valves could be too tight allowing loss of compression. So could bad rings, or a blown head gasket. If a valve was too tight for too long it could be burnt.

 Check your valve lash and adjust if needed. If still low, squirt a little oil in the spark plug hole and check compression again. If it goes up, it could be your rings. The oil helps them seal a little better temporarily for the test.

Crank it over with the spark plug out and see if any water blows out to check the head gasket. Is the oil milky? Any white exhaust smoke? Condensation on fill cap?

Not sure what else you checked. Just throwing ideas out there. Good luck, hope it's just a tight valve.

[lucky7 [OP]]

Gonna pressurize cylinder tommorow did the oil rings are fine no water in the oil or white smoke but started out of the blue

[lucky7 [OP]]

Talked to a couple of people who have broke valve springs hoping thats it.

[lucky7 [OP]]

#1 exhaust valve is so tight its open still wondering why?

[superyota]

by any chance was the timing belt just replaced?  i got a motor for my 90 runner a while back from a guy that said he had put a new belt on it.  ended up running like crap.  after checking it all out, found that the driver bank cam was off by 5 teeth and passenger off by 2.  thats the only other thing i can think of if its not valve adjustment or valve spring.  unless its a burned up valve.

[lucky7 [OP]]

pulling cam tommorow think a spring keeper broke pushing the lifter up