Sealing Firewall

[kerry]

I had to install a new tach cable and I need to reseal the hole it travels through the firewall.  I was thinking of using 100% silicone.  Before going with the silicone I was wondering what others have used.

[ArtVandelay]

I would think whatever you use should be fire resistant, hence the name., if using silicone get the fire resistant kind.

[N201MKTurbo]

It originally used MIL-P8116B zinc chromate putty. You can still find it if you look hard enough.

[KSMooniac]

I got some true firewall sealant from a vendor in Wichita, but can't remember their name.

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[Piloto]

I have used marine grade silicon with good results. Make sure the cable is clamped to the engine mount to minimize movement through the firewall hole.

 

José

[HRM]

I had to install a new tach cable and I need to reseal the hole it travels through the firewall.  I was thinking of using 100% silicone.  Before going with the silicone I was wondering what others have used.

 

The orange, high-temp stuff. I think you can get it at Autozone, O'Reilly's, etc. as it is used in car engines as well.