Thermostat & waterpump install

[ttman4]

Hello, last nite I pulled my thermostat on my '94 FTIDI & PO had installed it with tons of Red RTV, no gasket & some offbrand broken thermostat. What gasket sealer you usually use on new gasket as well as new waterpump gasket?
BTW I got new Motorcraft thermostat.

 

[hacked89]

Thermostat - no rtv
Water pump - aviation permatex

I’ve done 5 or 6 like this no issue no leaks.
I’m not inventing something new either, this is by the book.

 

[Nero]

Also be aware to use the correct bolts for the top two water pump. Putting longer ones in interferes with the gear for the injection pump and will take out the pump. Ask me how I know....

 

[bulletpruf]

Also be aware to use the correct bolts for the top two water pump. Putting longer ones in interferes with the gear for the injection pump and will take out the pump. Ask me how I know....

The middle two on the bottom can also interfere with IP gear...

 

[ttman4]

Thermostat - no rtv
Water pump - aviation permatex

I’ve done 5 or 6 like this no issue no leaks.
I’m not inventing something new either, this is by the book.

Ok thanks.
Thermostat gasket only? Or aviation permatex too?

 

[typ4]

Aviation will work on both of those gaskets, Its my personal preference on many.

 

[IDIBRONCO]

I use a very thin coating of RTV of both. Only because it makes later clean up easier. The gasket doesn't stick that way.
Ttman, before you install your new water pump, I recommend to lay a flat file across the mating surface of the water pump and gently run it across. I've had burrs on reman water pumps that would cause a leak and this removes any burrs that may be on there. It's also a good idea for new water pumps.

 

[hacked89]

Ok thanks.
Thermostat gasket only? Or aviation permatex too?

Thermostat I use gasket only but nothing wrong with aviation on both

 

[Rdnck84_03]

I usually use wheel bearing grease smeaared on both side of paper gaskets. Haven't ever had an issue with leaks and removal is usually easier.

James

 

[ttman4]

OK Thanks everyone for the replies. Tomorrow the day to do more of my fixings. This has turned into a nasty time consuming chore.
Loosen the turbo, replace valley pan grommet, valve cover gaskets, waterpump, thermostat, IP replacement, new injectors, ( @typ4 ), glowplug controller new placement, etc, etc, all on my '94 factory IDIT engine in my '90 CC Dually