Valve cover gaskets and RTV

Tiny
DUSABRIVE
  • MEMBER
  • 1993 HONDA CIVIC
  • 1.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
I'm about to change the valve cover gasket. The Haynes manual says to use RTV with the rubber gasket but when I called up Permatex their technical support person says to use nothing but the rubber gasket and no RTV. Who do I listen to?
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Tuesday, June 11th, 2019 AT 4:09 PM

2 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

On rubber gaskets, you never use RTV. It will cause the gasket to move and you will have a leak.

Install it dry.

Roy
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Tuesday, June 11th, 2019 AT 4:50 PM
Tiny
STEVE W.
  • EXPERT
With a rubber gasket you don't want to add RTV as it will act like a lubricant and cause the gasket to squeeze out of place, On the molded ones that go into a groove in the cover you don't use it because it will cause the gasket to torque unevenly and leak.
The only time you might use RTV with a rubber gasket would be if there is a seam under the gasket and the manufacturer calls for a small amount.
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Tuesday, June 11th, 2019 AT 4:51 PM

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