FMS Thermostat housing

[cobra_2_76]

Any one installed Ford Motorsports 90 degree thermostat housing with the sensor housing screw on the top?

Just installed mine and just by filling it it leaks around the screw. I used teflon tape so I assume something else is not quite right. Did these have gaskets for the screw?

Dave

 

[HISSIN50]

Dave, you are far from the first to experience this. THe solution for many is to sand the chrome off around the hoses (that seems to be a source of leakage), but it doesnt sound like that is your issue.

Did you use a gasket? Some gasket maker might be in order. I would use a flat-edge (machinist's edge) to make sure both surfaces are plumb too.

Good luck.

 

[NRM90GT]

removing the screw and putting rtv sealant on the threads will fix the leak. it will probably continue to leak from everywhere else though. i painted my stock housing aluminum and put it back on after getting so frustrated with the FMS part.

 

[rowdie- stang]

Had the same problem....Just use the RTV silicone on the threads

 

[PRO50SC]

Had the same problem....Just use the RTV silicone on the threads

Same here

 

[cobra_2_76]

Before reading this I was thinking about sanding and polishing my stock piece....sounds better all the time.

Ironically it leaks and I haven't even started the engine, so if the chrome promotes leakage, I shudder to think of what may happen when theirs pressure.

One previous comment mentions a gasket....on the screw. It seemed logical to have one there, but I wasn't sure. Is that what the reference was to?

I only use Felpro gaskets since I have had the best luck with them. I always let the gasket tack set up and work slowly to avoid those irritating leaks at the manifold.