Crankcase pressure

[Spanky_DSM]

i just did a boost leak test and had crankcase pressure. I had already done so and suspected the pcv valve. A pal on tuners gave me a bypass valve to put between the pcv and intake hose so air would only flow into the intake manifold.

Doing another boostleak test after the install i still had crankcase pressure which i suspect is loosing all my boost thru a stock cam gear and also flowing out thru the breather tube.

he had mentioned valve stem seals? is a DIY? any other possibilities?

and around how much does the job cost? heres a quick vid and thanks for any replies and input!


Crankcase pressure leak - YouTube

 

[TSITurbo95]

Yes valve stem seals. It "can" be a DIY, depends on your knowledge.

 

[Spanky_DSM]

Yes valve stem seals. It "can" be a DIY, depends on your knowledge.

Well i just went thru acouple of threads and it seems like i need some sort of special too which seems quite pricey.

anyone got an estimate how much a shop would charge?

 

[04bls84]

Its not very hard to do. You will just need to pay attention to a manual or tech article but is a pain in the a$$. Especially if you do them while the heads on the block inside the engine bay. Of it's off it's a lot easier to work worn and takes less time except you have to tear the head off and put it on when your done.

 

[Spanky_DSM]

could it be a cam gear seal?

Mitsubishi Eclipse Cam Seals DSM Talon 4g63 Evolution on eBay!

or there should be no pressure at all underneath the valve cover?

 

[Spanky_DSM]

anyone know how much the bill would be at a shop and how an estimate on the hours of labor for the job on the 2g?

 

[Spanky_DSM]

so no price estimate not including the valve stem seals?

 

[noV8undrDIShood]

My buddy paid about 65 bucks to have his head hot tanked and new valve stem seals put it. But that price included the head to be disassembled and reassembled. Price also does not include the valve stem seals..

Every shop is going to be differenton rates, your just going to have to give a local shop a call that you trust and get a qoute from them. Thats the best advice I can give you if you cannot do it yourself.

 

[Calan]

A pal on tuners gave me a bypass valve to put between the pcv and intake hose so air would only flow into the intake manifold.

Huh?

could it be a cam gear seal?

The cam end seal wouldn't have anything to do with crankcase pressure, but are you leaking oil behind the cam gear?

or there should be no pressure at all underneath the valve cover?

Yes, the interior of the VC will see the crankcase pressure. (That's where you pour the oil that goes into the crankcase...right? )

*********

It's normal for some boost to leak into the crankcase past the rings, depending on valve overlap, condition of the rings, engine tolerances, etc. Just be sure that any crankcase pressure that is being generated while the engine is running is being properly relieved and not allowed to build up.

Are you burning any oil, particularly when you first start the engine after sitting a while? If not, it's probably not worth the time and money to tear the head apart for new valve stem seals unless it really needs them.

It also wouldn't hurt to do a compression and leak-down test just to get a better idea of your engine's health.

 

[Spanky_DSM]

Huh?



The cam end seal wouldn't have anything to do with crankcase pressure, but are you leaking oil behind the cam gear?



Yes, the interior of the VC will see the crankcase pressure. (That's where you pour the oil that goes into the crankcase...right? )

*********

It's normal for some boost to leak into the crankcase past the rings, depending on valve overlap, condition of the rings, engine tolerances, etc. Just be sure that any crankcase pressure that is being generated while the engine is running is being properly relieved and not allowed to build up.

Are you burning any oil, particularly when you first start the engine after sitting a while? If not, it's probably not worth the time and money to tear the head apart for new valve stem seals unless it really needs them.

It also wouldn't hurt to do a compression and leak-down test just to get a better idea of your engine's health.

well the reason i really want to replace the valve stem seals is because its a boost leak source isnt it?? Car pulls but jst not as great as when i first got it.

and i did start to see light smoke during idle after driving around for a bit.

 

[92AWDHX40]

Valve stem seals, a boost leak source never heard of that, i could be wrong though. Light smoke, could be valve stem seals, rings, a bad turbo, or a hg. Do a leak down test, compression test

 

[Spanky_DSM]

Valve stem seals, a boost leak source never heard of that, i could be wrong though. Light smoke, could be valve stem seals, rings, a bad turbo, or a hg. Do a leak down test, compression test

ill go ahead n try to do the leak down test. anyone else know if bad valve seals could be a boost leak source?

 

[92AWDHX40]

I never heard of stem seals and boost leaks, only the intercooler and vacuum hoses and sng much nothing inside the head.

 

[Calan]

ill go ahead n try to do the leak down test. anyone else know if bad valve seals could be a boost leak source?

If they are really shot, then it's possible I guess. But I think it would be more likely that your compressed air would blow the valves open slightly with old stock valve springs during the test, or air is just leaking past the valves due to overlap.

If the only boost leak you have is internal to the head and everything checks out good with a leak-down test (and the car isn't smoking a lot), I wouldn't worry about it.

 

[Spanky_DSM]

If they are really shot, then it's possible I guess. But I think it would be more likely that your compressed air would blow the valves open slightly with old stock valve springs during the test, or air is just leaking past the valves due to overlap.

If the only boost leak you have is internal to the head and everything checks out good with a leak-down test (and the car isn't smoking a lot), I wouldn't worry about it.

alright thanks for the post and all advise given!

now im actually starting to think i could have bad compression.
it smokes lightly on idle. white smoke.

hopefully jst turbo seals and nothing internal!

this car is my daily so ive got to keep my fingers crossed.