North American Turbocoupe Organization



Compression checks out fine, now what???
Kev Offline
Posting Freak
#1
Hey guys, a few days ago, I posted about my valve cover blowing out. I had the guys at the shop run a compression check and it looks fine. He said he got 150 across the board. There is no kind of smoke out the tail pipes, and since the compression is good, then I'm looking at something else besides rings, right? Before I blew the last valve cover gasket, I bought a new pcv valve and put it in. I also cleaned out the breather and the tube that goes back to the turbo. I didn't, however, clean out the tube that attaches to the bottom of the pcv valve. Where does that hose go? What I need to know from you guys is what every part of the pcv system is so I can check it out. I'll go ahead and get another pcv valve when I get the new valve cover gasket. But I only want to take this thing apart once, so I need to know all I can so that I will be ready. Thanks

Kev
Kev
1988 TC 5spd
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Pete D Offline
Administrator
#2
The bottom hose of the PCV goes to the oil seperator. It's a sheetmetal part press fit into the block near the oil filter. It is suppose to keep oil spray from going up the PCV hoses to the intake. I have heard they can clog up but never seen it first hand.If you can blow through the big hose that the valve fits into, it's probably OK.
Test the valve you have before buying another new one. Hold it so that it's basically up and down then try to blow through the small end. The passage of any air means the valve is bad or it's the wrong valve. If you have to buy a new valve, test it at the parts counter.

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NATO Member. it's not a vice, it's an obsession
Good judgement comes from bad experience, and a lot of that comes from bad judgment.
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm
Pete Dunham


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Jeff K Offline
Administrator
#3
The oil seperator on the block just has a series of plates in it that makes the air travel a zig zag path on its way ot the PCV hose. I suppose they can get clogged, but not real likely. try jamming a foot or 2 long hose in the PCV hose to the seperator, and see if you can blow thru the seperator (and into the crankcase). If you can blow with little to no resistance, it isnt plugged.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 02 Taurus Vulcan(wifes car)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Kev Offline
Posting Freak
#4
I tested the one that I put in there first. I couldn't blow air through it at all. The old one I took out was very difficult to blow air through. (see..red face and fat cheeks), but I could barely blow air throught that one. Jeff said something about the valve not sealing, just once by chance, and that could have blown out the valve cover gasket. Is that an often or normal occourance? I drove the hell out of the car for 2 weeks, then the day I was nice to it was when it blew out. Could boosting the turbo make the pcv system work better, and laying off the turbo make the system pressurize some how? It seems very strange for this to have happened in a 20 minute drive without using boost when the day before I drove around for at least a half hour beating on the car like it was stolen. I'm lost.

If the bottom hose is plugged, could that cause the VC gasket to blow out?

[This message has been edited by Kev (edited 03-28-2003).]
Kev
1988 TC 5spd
Reply

Kev Offline
Posting Freak
#5
No more ideas on this guys? I'm stumped this time. I'm ready to just vent the valve cover some how since I can't think of anything else to check. Is there a replacement part for the breather element? Maybe the mesh in mine compacts and won't let the pressure out? I just don't know.

[This message has been edited by Kev (edited 03-30-2003).]
Kev
1988 TC 5spd
Reply

Pete D Offline
Administrator
#6
I think it was coincedence that the gasket let go after the abuse and during the day you were nice to it. The damage was there and it just needed one more thermal cycle for the gasket to pop. The old valve was letting boost in and that built up the pressure behind the gasket.

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NATO Member. it's not a vice, it's an obsession
Good judgement comes from bad experience, and a lot of that comes from bad judgment.
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm
Pete Dunham


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Kev Offline
Posting Freak
#7
Thanks for the reply Pete, but the last time the valve cover gasket blew was after I put the new pcv valve in. That's why it's not so cut and dry for me.
Kev
1988 TC 5spd
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