6 replies to this topic

[Pairaminis]

I'm trying to determine why I have leaks around the base of my thermostat housing in my newly rebuilt 998.  Can someone tell me if all the holes where the mounting studs screw into the head beneath the thermostat housing are plugged on the end?  Are any of them open to the water jacket beneath them?  Water is wicking up the threads on one of my stubs.

Jack

[Spider]

They are normally blind holes.

 

You'll find that the coolant is tracking across the gasket to the stud holes and coming up them that way. The gasket width right where the stud holes are is only thin and and it takes very little distortion in the cover to have them leak.

 

Maybe start by removing the cover and getting it flat by rubbing it across a sheet of 120 paper on a sheet of glass.

 

I've found RTV sealant on these better to use than most other types of sealants.

[RooBoonix]

I have also found the newer type of gasket sold my minispares, I believe it is grey on one side and red on the other, simply isn't very good. I had to goop mine up with RTV and I still got then leaking through the mounting bolts like you have.

 

I find the thicker "old/original" type much better.

 

Just my experience.

Cam.

[dyshipfakta]

What's the housing itself like? Any corrosion or pitting on the surface ditch it and get a new one.

[Pairaminis]

I forgot to mention I have a new housing.  Also, one of my stud holes is open to the water jacket below it.  Hopefully I can find a way to put something on the threads that will keep water from chasing them upward.  

 

Will sand the housing base a bit today as suggested and will get a better gasket.  The cork one I had is rubbish.

 

Thanks.

 

Jack

[RooBoonix]

Loctite do some good thread sealants. Or they also do "Lock n seal" products which are both a sealant and thread locker. Also, apply some form of anti sieze to the shank of the bolt/stud where the housing goes over/through it.. it'll help stop them corrode and make them easier to remove in the future.

[Pairaminis]

Thanks everyone.  I appreciate the feedback.

Jack