FrankLT4CE

My water pump began leaking and I decided to also change the plug wires and Optispark while I had the water pump off. My question is: the forum Tech Tip on optispark repair states to use Premium Black Permatex RTV because it withstands the highest temperatures. The black RTV is used to seal the base to lower cap, and the lower cap to upper cap. I have searched 3 stores and have seen copper RTV, blue RTV, red RTV, and Black Silicon Adhesive Sealant all of which are made by Permatex. I can not find Black RTV made by Permatex. But it is interesting that the Black Sealant is the only one that is marketed as waterproof and insulates wires. Also in the photo on the package the Black Sealant comes in it shows a person applying the product holding the tube that says Black RTV to seal weather strip around a car door's interior. I am a little concerned that this may not be the right product since it is no longer marketed as RTV and because it is not marketed as being for high temperatures. Does anyone know more about this? Where do I buy the right thing to protect my $260 investment in a new optispark. Thanks in advance for all replies. FrankLT4CE

AquaMetallic94LT1

You can use any RTV sealant that can handle the temps. They are all designed to seal and are silicone so they can handle the the temps that the opti will see.

SPD DMN

I use the copper RTV on everything, including the exterior of the opti. It withstands the most heat, but also dries the slowest so you have to allow for adequate set time. I just caked it on the outside of the seals rather than dismantling the opti.

FrankLT4CE

Thanks. I took your advice and went with the copper RTV. Regards, FrankLT4CE