avainio

I want to do this only once. Clark from Clark's Garage uses a thin layer of grease on both sides of the gasket, a trick he got from an old Porsche mechanic. Jay Cohen (toolmaster) uses Hylomar (sticky blue stuff, I've never seen it), says he's never had a problem. I've always used a thin layer of RTV on both sides of the gasket on my musclecars with no problems, but my 951 is definitely not the same. What has everyone else used? I searched the old threads and didn't find anything definitive. Thanks in advance.

Arne.

MichelleJD

Yeah. Me too. I hope to have mine in before too long and would like to know what to use.

Tabor

I used a bead of red RVT sealer. It has worked fine so far.

Riff

Used the same stuff as the Toolmaster, the Hylomar has worked great so far.

Bri Bro

I normally use grease, but some gaskets are so thin and large you need RTV to hold them in place.

I would be a little careful of using Red RTV (high Temp) on aluminum. It is acidic and will eat into the Aluminum. See note below:

Not for use in delicate electrical and electronic applications in which corrosion of copper, brass, or other sensitive metals is undesirable.

This RTV will work.

Permatex® Water Pump and Thermostat RTV Silicone Gasket
A noncorrosive, sensor-safe RTV silicone gasket material formulated specifically for water pumps and thermostat housings. Highest water-glycol resistance available in an RTV silicone.

Perry 951

The book calls for a light coat of Moly Grease. I have installed them dry on my car and they were tight as a drum.

951sickness

I'll have to agree with Perry....use nothing. I have changed the water pump four times (don't ask) and each time I installed it dry. Not one time was there even the hint of moisture.

Danno

Since this is a water gasket, you can use any of the silicones just fine. Don't use silicone on gaskets that face oil or gasoline...

avainio

Thanks! Knowing what doesn't leak is helpful, especially with torque values of 6 foot pounds (which seems barely more than finger tight).

Arne.