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#570722 - June 25th 2012 1:13 pm Leaky Thermostat Housing
strangeblue Offline
newbie

Registered: April 01st 2012 8:07 pm
Posts: 37
Loc: Chattanooga, tn
I changed out my water pump this weekend...

almost did my timing chain... but chickened out. (afraid I might screw something up.)

But anyways. I bought a new thermostat and rubber seal.

but everytime I start the car. It Leaks...
In between the seal and out of the screws...

I have tightened the screws as good as I can.

Do I need to use some liquid seal of some sort?

What to do??

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#571107 - June 26th 2012 9:59 pm Re: Leaky Thermostat Housing [Re: strangeblue]
Uncle_Fester Offline
Festerus Vannimus

Registered: May 26th 2007 10:41 pm
Posts: 8820
Loc: On Route 66 in Bethany Oklahom...
First off, good job so far! I would clean that black stuff off the mating surface with a wire toothbrush, then a THIN coat of blue RTV around the mating surface of the T-Stat housing ( the dome part you took off), put it all together and DO NOT OVER TIGHTEN! I install mine with a 1/4 drive ratchet so as not to over tighten. Give it about ten min or so to "set up" before you start the motor.

This is how I do my t-stat swaps twice a year. I run a 160* in the summer, and a 195* in the winter. SEAMS to keep it cooler in the summer and better heat in the winter. . .
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#571152 - June 27th 2012 7:26 am Re: Leaky Thermostat Housing [Re: strangeblue]
Bullet Offline
old hand

Registered: September 10th 2009 9:14 pm
Posts: 1016
Loc: Bristol, TN
Is it just seeping a tiny bit or is it more than that? Clean the recess in the intake, get a good piece of 220 grit wet/dry sandpaper and place it on a flat surface, attach it some way, 2" tape all the way around, then put your thermostat housing on it and work it in a figure 8. Do this about 20 times and check the bottom, if it's warped you will notice some areas not touched by the sanding. Keep doing this until its nice and flat, you may have to use a couple pieces of sandpaper. If it's warped bad, you may be time and money ahead to replace it. It should seal with the rubber O-ring without using any RTV, but a thin, thin coat of sealer wont hurt anything. Don't over torque the bolts as this can cause problems too.
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#571196 - June 27th 2012 12:17 pm Re: Leaky Thermostat Housing [Re: strangeblue]
NateNCBV Offline

Administrator

Registered: August 23rd 2005 12:00 pm
Posts: 20415
Loc: Brooklyn Park, Maryland, USA
If the bolts thread into a water jacket, you will need some thread sealer on them.
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#571215 - June 27th 2012 1:35 pm Re: Leaky Thermostat Housing [Re: strangeblue]
vanatic05 Offline

Vanaholic


Registered: June 02nd 2005 12:00 pm
Posts: 5144
Loc: Auburn IL
Also it looks like you have another gasket in the block still remove the old gasket...
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#571306 - June 27th 2012 9:31 pm Re: Leaky Thermostat Housing [Re: strangeblue]
Phoenix Offline
pooh-bah

Registered: September 13th 2008 4:42 pm
Posts: 3337
Loc: Evansville, Indiana
If you have a chrome housing they all leak until you take them to a belt sander and make them flat on the bottom... Just a thought , it is what I had to do.
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