Author Topic: pcv valve (Read 4931 times)

shopro88 · « **on:** January 17, 2009, 10:19:32 am »

Hi, I have a 91 jetta ecodiesel. few weeks ago I noticed I was leaking some oil. I took it to the shop and my mechanic said the head gasket was leaking, so I told him to go ahead and replace it. got the car back and it still is leaking a good bit of oil, even worst then before. my dad said that it could be the pcv valve isn't working correctly and is allowing pressure to build in the block. is it possible for seals to leak from pressure in the block, caused by the pcv valve?

dillenger1 · « **Reply #1 on:** January 17, 2009, 02:53:02 pm »

definetly!ty blowing out your crank breather/oil stop screen on the valve cover.

Smokey Eddy · « **Reply #2 on:** January 17, 2009, 04:46:33 pm »

With Dilly on this one.

wash it out with solvent perhaps?
ps. its that meshy thing in the valve cover that dilly mentioned.

if you're very mechanically savvy changing the piston rings would also help. But since you got a mechanic to change your HG/look for oil leaks im thinking that may possibly be a big job for you. (tools wise)

Rabbit TD · « **Reply #3 on:** January 17, 2009, 08:51:59 pm »

Quote from: "Smokey Eddy"

With Dilly on this one.

wash it out with solvent perhaps?
ps. its that meshy thing in the valve cover that dilly mentioned.

if you're very mechanically savvy changing the piston rings would also help. But since you got a mechanic to change your HG/look for oil leaks im thinking that may possibly be a big job for you. (tools wise)

Do the 1.9's even have a pcv valve or is it just vented, I've never worked on anything other than the 1.5's and 6's.

burn_your_money · « **Reply #4 on:** January 18, 2009, 07:19:24 am »

1.9 IDIs have the PCV valve, not sure about TDIs.

The shop might have messed up putting the valve cover on, or it may be warped. Take it off and check it with a straight edge and also inspect the gasket. I'd recommend upgrading to the ruber valve cover gasket.

Have you been able to see where it is leaking from?

Rabbit TD · « **Reply #5 on:** January 18, 2009, 07:38:09 am »

Quote from: "burn_your_money"

1.9 IDIs have the PCV valve, not sure about TDIs.

The shop might have messed up putting the valve cover on, or it may be warped. Take it off and check it with a straight edge and also inspect the gasket. I'd recommend upgrading to the ruber valve cover gasket.

Have you been able to see where it is leaking from?

Is there a rubber valve cover gasket for the 1.6 and where do you get them :?:

cyrus #1 · « **Reply #6 on:** January 18, 2009, 09:23:17 am »

Quote from: "Rabbit TD"

Is there a rubber valve cover gasket for the 1.6 and where do you get them :?:

Myke W on the forum has them. As does German auto parts, etc. I've used it without problem on all of my cars. You have to replace the studs as well but the gasket itself is one piece so it's fairly foolproof.

burn_your_money · « **Reply #7 on:** January 18, 2009, 10:05:35 am »

Giles can also get them, although I don't think we can get the stock studs anymore. We can definitely get suitable replacements.
It's the valve cover gasket and studs for a mk3 ABA motor. The G60 engine also used the rubber gasket.

shopro88 · « **Reply #8 on:** January 18, 2009, 05:30:09 pm »

its now in the shop to get the front main seal, not a big job plus hes goin to do it for free. I cleaned the pcv when I first got the car and was going threw it, and the pcv was checked out again by my mechanic. the car only has 140,000 miles on it, ya think it would need rings? no blue smoke and very little oil consumption.

Smokey Eddy · « **Reply #9 on:** January 18, 2009, 06:14:53 pm »

Quote from: "Rabbit TD"

Quote from: "burn_your_money"
1.9 IDIs have the PCV valve, not sure about TDIs.

The shop might have messed up putting the valve cover on, or it may be warped. Take it off and check it with a straight edge and also inspect the gasket. I'd recommend upgrading to the ruber valve cover gasket.

Have you been able to see where it is leaking from?

Is there a rubber valve cover gasket for the 1.6 and where do you get them :?:

I have one i don't need anymore. It's in perfect shape. Pm me.
I also have bolts that fit the holes and thread pitch. ground to the right lengths for the holes. they are a lot nicer than using studs fumbling with the little nuts and all that rubbish (i find anyways). I'd send them to you with the gasket if you want mine. It's used obviously but it still is in perfect working order. Never leaked.

Smokey Eddy · « **Reply #10 on:** January 18, 2009, 06:23:38 pm »

Quote from: "shopro88"

its now in the shop to get the front main seal, not a big job plus hes goin to do it for free. I cleaned the pcv when I first got the car and was going threw it, and the pcv was checked out again by my mechanic. the car only has 140,000 miles on it, ya think it would need rings? no blue smoke and very little oil consumption.

Rings are always a bit of a gamble unless the oil consump is through the roof. The oil can either get past the valve stem seals or the rings. usually its valve stem seals. Bad rings would give poor compression but you'd need a comp tester. Unless it burns really white even when warm.... white burning when warm is incomplete diesel burn.

Rabbit TD · « **Reply #11 on:** January 19, 2009, 08:06:24 pm »

Quote from: "Smokey Eddy"

Quote from: "shopro88"
its now in the shop to get the front main seal, not a big job plus hes goin to do it for free. I cleaned the pcv when I first got the car and was going threw it, and the pcv was checked out again by my mechanic. the car only has 140,000 miles on it, ya think it would need rings? no blue smoke and very little oil consumption.

Rings are always a bit of a gamble unless the oil consump is through the roof. The oil can either get past the valve stem seals or the rings. usually its valve stem seals. Bad rings would give poor compression but you'd need a comp tester. Unless it burns really white even when warm.... white burning when warm is incomplete diesel burn.

My 1.6 N/A burns oil mainly when idling for a while like a long stop light or something like that, you can tell by the smell it's oil, 15/40 Shell and leaves a good bit of blue smoke when you start off even easy after idling at the light. The motor was rebored .020 and the head rebuilt at the same time supposedly with new seals about 30,000 ago. The motor runs and starts exellent and gets 50-52 mpg at around 65 mph and had 425 on all cyls when I put it together. Do you think this is going through the valve guides? It doesn't even smoke blue when I take off hard, just black and again this little motor couldn't run any better, if it is the valve guide seals are there some better than others. Companies have changeds so much over the years and I don't know what's good and what's junk anymore on a lot of stuff. I have a hard time believing it's the rings on this motor the way it runs and starts.

cyrus #1 · « **Reply #12 on:** January 19, 2009, 09:13:49 pm »

Sounds like valve stem seals. They were gone on my gasser and I was using like 4-5 liters between oil changes. Replace the valve stem seals and that went down to about .5 liters. It's possible the valve seals were damaged during installation. They should last longer than 30,000. :?