Places to use Curil T
 

I read a post the other day where Henry was talking about the warrantee on his engines and the use of Curil T on cylinder base gaskets to prevent leaks. Aside from the few places where Wayne recommends its us in his book, are there any other 'key' places where Curil may be used effectively?

It is my experience that Curil T is only appropriate for sealing cylinders and gaskets that are expected to be replaced often.
We also use Curil T to seal transmission gasket on race boxes that we rebuild regularly.
Come to think of it we often use it on sump plate gaskets.

I use Hylomar on through-bolt o-rings, cylinder base gaskets, and oil return tubes. It never hardens, and lubes the o-rings during heat expansion. It also is self-healing. I use 935 rocker shaft seals on every motor, and and have never had a leak yet. (Except some seepage on mag case engines. Hey, I'm not God.) :)

I can't tell you how many times people blame oil return tubes and cam cver gasket leaks for what are actuallt rocker shaft leaks.

Once they are torqued for the first time at the factory, the rocker shafts indent the cam tower, and getting them to reseal perfectly after that is nearly impossible, especially using the factory torque spec. That's why I think the 935 rocker shaft seals are essential.

But back to the subject, I prefer Hylomar to Curil-T, but they are probably the same thing.

In hindsight I would use it to impregnate all my paper gaskets before assembly on a rebuild.

I also use it in place of teflon goop as a thread sealer.

Hylomar/Curl-T works wonders on warped sump plates that would otherwise leak with dry gaskets. They only need to be overtighened once to warp them. Now, I know the correct thing to do is to buy a new sump plate, or to have the old one machined flat, but sometimes you just need to get the car back together.

JP

I foget which Curil it is, but its tan in color, reminds me of Now and Laters candy when you smell it. Not that has any benefit to this thread whatsoever, but anyhow.

The Curil I've been using is green (Curil T) and does have a strong almost sweet smell to it.

Would any of you ever consider using this on the compression fittings for the external thermostat? Not in the threads but a thin layer on the mating surfaces? I've heard these can be a bear to keep leak free without massive torque on the fitting.

Wouldn't hurt. Wayne recommends teflon tape, I strongly disagree. I would suggest a teflon paste instead.