Hissing when cylinders pressurized? Bad?

[SuperSix]

I'm putting new valvesprings in my 86 TR, and when I put in the air holds @ ~100PSI, I can hear/feel a good amount of pressure leaking past the exhaust valve. Is this normal?

Time for a valve job?

 

[Tow Man]

Are you sure the air is leaking at the valve??

The leak you hear is probably air escaping through the ring gaps into the crankcase. This is normal!

 

[timothydog]

I'm in the middle of doing my valvesprings too.
I noticed the same thing. Good to hear it is common.
Boy that passenger side is bitch. Especially the back couple of springs. Hopefully the driver side will be easier.

 

[MyWE4]

Well , if there all hissing about the same , I would say it is ok....
but if one cyl. is doing it more than the others,you may want to look into it deeper........


Chris

 

[SuperSix]

It's definately coming through the exhaust valve, It's cylinder #1, and I can feel the air coming out of the up-pipe, as I have the turbo off too...

Screw it, I should just pull the heads and get 'em done anyway...

 

[timothydog]

right....
how much extra work could pulling the heads be? hehe

 

[SuperSix]

Originally posted by timothydog
right....
how much extra work could pulling the heads be? hehe

THe car has 150+ k on the engine, was rebuilt before I got it, a port match and 3 angle couldn't hurt..