Curil T for Cylinder foot gasket mandatory

[HKZ Bob]

Dear rebuilders,

I would like to know if a little layer of Curil T is mandatory for the area of the cylinder foot and spigots.


I would like to know if there is experience in leaking in this area?

Regards Bob

[1982911SCTarga]

I've read and heard mixed opinions on the benefits, but in my mind there's really no downside to doing so. In my case I used hylomar on the cylinder base gaskets.

Brian

[coxy]

Doesnt Wayne mention Locktite 574?

[cgarr]

I used nothing, no problems.

[WERK I]

The base gaskets come pre-treated with a somewhat tacky feel to them. If you decide to add a film of sealer to both sides of the gasket, I would use a soft gasket sealer on the base gaskets such as Curil-T, Hylomar or equivalent.

[lucittm]

Curil T is a Non-Hardening, Temperature Resistant Sealing Compound and forms an excellent seal where abnormally high internal pressures exist even at extreme temperatures. It is particularly suitable for sealing against mineral oils, synthetic oils, greases, diesel and motor fuels, alcoholic solvents, gases, air, water and seawater. For applications, Curil T has a synthetic base which is ideally suited for sealing combustion engines, turbo blower exhausts, turbines, generators, gearboxes, pumps and other power units as well as threaded connections of all kinds. This is especially appropriate for sealing the Cylinder Head Seal to the Crankcase. Temperature Range of Curil T is approximately -40c to approximately +250c.

[cnavarro]

We recommend Curil T for all cylinder bases, even without shims.

[Roslin]

I used Curil-T on both sides, and have absolute no leaks !

[jpnovak]

I used it on my cylinder bases with no base gaskets/shims. No leaks.

[Roslin]

I used the Curil T on both sides of the copper seal. Absolutely no leaks after 4 years!

Roslin

[KTL]

Originally Posted by coxy

Doesnt Wayne mention Locktite 574?

I believe he does. I would disagree with that choice though. My recent engine rebuild has 574 at the cylinder spigots and it's a mess and it hardens. I would choose Curil T over the 574 since the Curil doesn't harden.

That said, i'd go without. Did a top end on my '87 3.2 and removing the heads of course relieved the squeeze on the cylinders and base gaskets. I was worried about the spigots leaking after reassembly because I didn't remove the cylinders and install new base gaskets. In fact, some of the cylinders moved off the case and I had to re-seat the base gaskets. 10K miles later still no leaks. Maybe I got lucky.

[Henry Schmidt]

Oil leaks are a roll of the dice when rebuilding a 911 engine.
Back in the early 90s a friend was working at the factory and reported to me that Porsche was experiencing a 4% failure rate due to oil leaks on new engines while running in the dyno. These engines were built by factory trained mechanics using new parts.
That number seems hideous. If they have that kind of failure rate what chance do we have?
Any extra sealant that can be applied with reasonable restraint is good insurance. IMHO

[Ken911]

I used curil t the first time and hylomar the second neither one has leaked and mine is a turbo motor.

[JohnJL]

The only motor I built that leaked from the cylinder bases was one I used 574. On all before and all since I've used curial and had no leaks. I am not a pro engine builder and i'm not claiming my results to be conclusive, just my limited experience.

Pulling that motor out and rebuilding it for those leaks was something I don't want to do again.

[Henry Schmidt]

Originally Posted by JohnJL

The only motor I built that leaked from the cylinder bases was one I used 574. On all before and all since I've used curial and had no leaks. I am not a pro engine builder and i'm not claiming my results to be conclusive, just my limited experience.

Pulling that motor out and rebuilding it for those leaks was something I don't want to do again.

The problem with using 574 on a base gasket is that it hardens and with the constant movement of the cylinders due to thermal expansion, the 574 cracks. The reason for using Curil T is that it is a non-hardening, high temperature sealant that forms a flexible joint.

I read somewhere that Curil T is certified for use in nuclear reactors.
Throw a set of thermal reactors on a 2.7 and that's just what you have

[haasad]

I can support the comment regarding the use of Curil T on nuclear reactors from practical experience, we also used 574 .

andy