advice on changing vale stem seals
- Thread starter int77345
- Start date
Winchested
Active member
Yep. A leak down test on that cyl would pin point where the oil is likely coming from.
FDChappie
Well-known member
Yes that's best, but not critical.
int77345
Active member
as for the leak down, when i replaced the valve seals on that cylinder i had compressed air on that cylinder to hold up the valves. no air got past the valves, because none came out the intake or the exhaust, and nothing got in to the radiator, no bubbles, i had the heater hoses off, noting came out of them, however air did get in to the crank case, could hear it and it would cycle the compressor on
jeff campbell
Active member
It's getting past rings then !
Robert Kenney
Super Moderator
What is the condition of your PCV system? Try disconnecting the PCV valve from the vacuum and plug . Start and retest.
Intake manifold gasket leak?
Intake manifold gasket leak?
Robert Kenney
Super Moderator
Rings always pass some air while pressurizing the cylinder.
Robert Kenney
Super Moderator
Poor mans compression test.
Disconnect the coil wire from the cap and ground the end to the block or other engine metal.
Crank the engine. The sound should be consistent pitch if all cylinders are even. If you hear a consistent rhythmic up speed as you crank the engine, you have one or more low cylinders. If it is smooth and consistent as each cylinder comes up on compression they are OK.
Disconnect the coil wire from the cap and ground the end to the block or other engine metal.
Crank the engine. The sound should be consistent pitch if all cylinders are even. If you hear a consistent rhythmic up speed as you crank the engine, you have one or more low cylinders. If it is smooth and consistent as each cylinder comes up on compression they are OK.