Luke

I just did a compression test on my motor ( warm )

5 or 6 cranks each. first crank would get up to around 60-90 psi

145, 148, 144, 143.

90k miles on the car.

i ordered the cylinder head gasket set and a timing belt from vertex. Should I replace my head studs?

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Luke

can anybody suggest a cam shaft?

Dave951M

Entirely possible no smoke in the tailpipe. Keep driving and that will change. Generally smokes when oil or coolant or both enter the combustion chamber. If the leak doesn't enter it, very little of the white smoke. You will probably see a drop in oil pressure and the temps go into the red.

As for the head studs, I would replace them (while you're in there...). If there is a shop that carries ARP fasteners near you, go get the full ARP catalog and there is a wealth of info on fasterners in it. While you're changing the studs, also change the nuts and washers too. Thoroughly clean out the motor to get the milkshake out.

TonyG

It's probably not your headgasket.

It's probably the oil cooler seal.

Especially if the motor runs fine, and there's no smoke out the exhaust.

Drain the oil and remove the oil filter.

Then pressurize up the cooling system with a pressure tester.

Then have a look at where the oil cooler threads into.

Luke

i was under the impression that wasn't a deal w/ the turbo cars?

fast951

Luke,

Find a race shop in your area that can test your coolant to determine if your headgasket is blown. They check for some kind of chemicals in the coolant... It may not be your headgasket!

shaheed

you can pick up the block test kit that john mentioned at NAPA...

Dave951M

agreed, there is a possiblity of the cooler seal

Luke

I thought the cooler seal wasn't an issue for turbo cars?

I'll be compression testing tomorrow, what sort of #'s should I expect to see?

TonyG

The issue of the oil cooler seal is no less an issue on turbo cars.

These seals have a bad rap. It's gone out on a brand new 944 turbo engine (within the first 2 minutes of operation causing all the oil and coolant to mix!). It's also had to be replaced on my 968 at 90k miles.

Yes it's an issue.

Also, it's much more likely to be the cause of oil/coolant mixing than a head gasket.

Head gaskets typically, when blown, cause excessive pressure to build in the cooling system, which in turn, causes coolant to be pushed out (usually either out of the radiator tank over flow, or causes a blown coolant hose).

I'd bet my money on the oil cooler gasket.

jdog

Luke,
I manage a Napa store.
The part number on the combustion leak test kit is 700-1006. They aren't expensive and can save you money by narrowing down your problem.
Thanks!! <img border="0" title="" alt="[Wink]" src="wink.gif" /> <img border="0" alt="[cherrsagai]" title="" src="graemlins/drink.gif" />

User 41221

The oil cooler seals can and DO fail on 951's, and I have experienced it first hand. Of course, when I finished repairing mine, 1500 miles later the headgasket blew... lol

Regards,

dmoffitt

wow luke, sorry to hear of your issues... i think you WANT it to be the head so you can get a new cam, huh?

j/k - but best of luck diagnosing, keep us posted!

silicondigital

The tubo still has a little "area" where the oil cooler lines go that might still be just a seal away from the coolant, where the oil cooler is on the N/As.

Luke

wow, thanks for all the responses , thanks guys.

"wow luke, sorry to hear of your issues... i think you WANT it to be the head so you can get a new cam, huh"

damn straight, actually I found a great place to do a nice 5 angle.