PCV Leak

[bigballsbilly]

I'm at my witt's end with this thing. Took intake and heads off, when putting back together used a Kirban PCV and Grommet. Leaks like a bitch where the PCV comes through the grommet hole. Again I stress that I used Kirban's! After taking the PCV back out and then reinstalling it using RTV ... it still leaked. So I ordered another set from Kirban. Still leaks. Now what? I can't believe I'm the only person to run into this. I did a search on PCV and didn't find this particular problem though.

I'm about to figure out a way to seal the intake hole without taking it off the car and just doing away with the freaking thing,

Any advice?

 

[Lil Truck]

Is it leaking around the gromet and intake or the PCV and gromet ? Leaking oil?

I purchased a replacement NOS gromet from one of the vendors, it was very hard to get in with the intake off, had to put it in hot water to make it easier to install. Later when the motor was finished and installed I put the new PCV in and it just fit loose.

I added a an O ring to the PCV to make it fit tight.

 

[bigballsbilly]

It is a vacuum leak not oil. I believe it is leaking where the pcv goes through the grommet. Yes I soaked the grommet in hot water to make it more pliabe before putting it in yhe intake. The pcv is difficult to get it into the grommet but it still leaks around it. Argh!

Where exactly do you put this o ring? Do you have pictures?

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[Lil Truck]

I dont have a photo at the moment, I just found an O ring in my kit that fit tight around the PCV and that took up the extra clearance. 1/2in dia x 1/8 or so.

 

[bigballsbilly]

Took up the clearance between the grommet and the "ridge" towards the top of the pcv? I have about a half inch between the grommet and that ridge. Should the pcv be pushed all the way down as far as it will go?

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[Lil Truck]

Yes, I pushed the PCV all the way in, the bottom lip holds tight against the grommet. sounds like you have more clearance than 1/8th inch?

 

[Lil Truck]

You can stack the O rings to take up more clearance.

 

[bigballsbilly]

OK great, I hope that's my problem. I'll try it tomorrow.

Thanks for the help!

 

[Raeban]

Not sure if this helps but here is a picture of mine when I had the intake off. Motormite 42056 grommet with ACDelco PCV and no way I could push that PCV valve in any further.

 

[TRICKSIXPA]

So question what did you do that made you believe you have a vacuum leak by the PCV?? The best grommets are from NOS4GN they fit great and did not need to soften them up to install.


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[bigballsbilly]

Sprayed the pcv with gum cutter with the engine idling rough and it smoothed out the idle.

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[bigballsbilly]

Has anyone eliminated the PCV valve by blocking off the hole in the intake and capping the vacuum line out of the vacuum block? I'm thinking about getting a rubber stopper to plug the hole in the intake.

 

[we4Mateo]

Has anyone eliminated the PCV valve by blocking off the hole in the intake and capping the vacuum line out of the vacuum block? I'm thinking about getting a rubber stopper to plug the hole in the intake.

You can do that if you have adequate breathers on each valve cover. You'll need to change the oil a little more often which isn't a big deal if you don't drive the car much.

 

[GNRick]

You can do that if you have adequate breathers on each valve cover. You'll need to change the oil a little more often which isn't a big deal if you don't drive the car much.

I don't think I would eliminate the PCV. My PCV got clogged with oil (or failed first then got clogged with oil) and oil shout out of the d/s breather. Also my gas mileage dropped.

 

[TurboBuRick]

The benefits of a pcv outway the alternative. Crankcase emissions is nasty stuff. It can enter the cabin and gas you out. The moisture and emissions inside the motor will no longer be vacuumed out. They roll around inside ultimately contaminating the oil. I can go on and on with benefits.

More reason to keep, the pcv is completely out of play when in boost. It does not affect performance in any way.

Keep it.

Rick

 

[we4Mateo]

The benefits of a pcv outway the alternative. Crankcase emissions is nasty stuff. It can enter the cabin and gas you out. The moisture and emissions inside the motor will no longer be vacuumed out. They roll around inside ultimately contaminating the oil. I can go on and on with benefits.

More reason to keep, the pcv is completely out of play when in boost. It does not affect performance in any way.

Keep it.

Rick

Probably doesn't matter if you drive less than 1,000 miles per year or just race the car. I think the above really only applies to somewhat well used TR's actually being used on the roads to some extent. If I drove 1,000 miles or less, I'd just change the oil once every year and eliminate the PCV. I drive too much to change my oil 10x per year.

 

[GNRick]

The benefits of a pcv outway the alternative. Crankcase emissions is nasty stuff. It can enter the cabin and gas you out. The moisture and emissions inside the motor will no longer be vacuumed out. They roll around inside ultimately contaminating the oil. I can go on and on with benefits.

More reason to keep, the pcv is completely out of play when in boost. It does not affect performance in any way.

Keep it.

Rick

Hey Rick...so would a bad pcv allow pressure to pass through it in boost and force oil out of the breather? When I tried pulling on the hose to remove the pcv, the pcv broke in two and was filled with oil. It was the plastic one from AZ that Eric recommends. I replaced it with a metal GM one. I've driven the car about 30 miles since and haven't seen any oil coming out of the d/s breather.

 

[TurboBuRick]

You think? A car that gets driven less has more moisture to get rid off than a car that gets driven more.

Rick

 

[TurboBuRick]

The pcv is a check valve as well. It keeps boost out of the crank case which would push oil out the breathers under boost.

So yes, a bad pcv could push oil out valve cover breathers.

Rick

 

[we4Mateo]

You think? A car that gets driven less has more moisture to get rid off than a car that gets driven more.

Rick

That's climate and storage dependant. If it sits in a climate controlled environment and isn't driven, there shouldn't be any moisture in the oil. Starting them and shutting them off without getting oil to temp is the fastest way to add moisture to oil next to burning E85. If you don't drive much, and get it hot when you do with good breathers, I still doubt you need a PCV. The only way to really know is to try it and sample/test the oil.