Thermostat drip - Team Camaro Tech
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post #1 of 16 (permalink) Old Jun 28th, 18, 02:48 PM Thread Starter
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Thermostat drip

I have been working on cars for many years. That said I can not get my thermostat to stop dripping. I have removed it three times, and replaced the Felpro gasket three times. I did use a little smear of black RTV. Been doing the same practice for years with no come backs. All was cleaned and surface was smooth and flat.

I bought a Mr. Gasket reusable water outlet gasket #738G. I can't believe I paid $10.00 for it, but I'm going to try it. I'm also replacing my original water neck with a Dorman #902-2014.

I just want it to work, and don't plan to pull it off and on. I have a factory heat shield under my carb, so that makes this job a real pain. Anyone used this gasket?
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1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018
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post #2 of 16 (permalink) Old Jun 28th, 18, 03:17 PM
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Yes and they work great !!! At least for me !😬
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post #3 of 16 (permalink) Old Jun 28th, 18, 04:25 PM Thread Starter
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Thanks, that is what I wanted to hear.

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post #4 of 16 (permalink) Old Jun 28th, 18, 05:14 PM
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Re: Thermostat drip

Check your bolt lengths, I had one bolt that was about 1/16Ē too long and would bottom out.

Thanks,

Jeff


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post #5 of 16 (permalink) Old Jun 28th, 18, 06:31 PM Thread Starter
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I tried the length. I ran it down without a washer first. Maybe the 1969 housing has a hairline crack. Dont know about that, but I do know I will be trashing it just in case.

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post #6 of 16 (permalink) Old Jun 29th, 18, 02:10 AM
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Re: Thermostat drip

The thermostat housing warps if over torqued. Lay a straight edge across the bottom from hole to hole to check it. I have used a wide file and then sand paper on a piece of glass to straighten the gasket surface on a housing I wanted to save due to numbers. Start with rough sand paper 80 or 100 grit and work down to 320 or 400 grit. Takes a while, but it will cure your leak. I can't remember exactly the grits I used.
I do the same thing on Holley base plates to save a carb.
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post #7 of 16 (permalink) Old Jun 29th, 18, 04:14 AM
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Re: Thermostat drip

As Ron suggest, not only the housing, but also the manifold.
Yes, gasket is expensive, but works.
Yes, the process of the housing warping is called 'creep'.
Being torqued over time, read pressure from fastening, the housing bends.

Store windows are very well known for this.
Over time, the glass will 150% thicker at the bottom than the top, in twenty years.
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post #8 of 16 (permalink) Old Jun 29th, 18, 04:56 AM
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Re: Thermostat drip

Quote:
Originally Posted by Everett#2390 View Post
As Ron suggest, not only the housing, but also the manifold.
Yes, gasket is expensive, but works.
Yes, the process of the housing warping is called 'creep'.
Being torqued over time, read pressure from fastening, the housing bends.

Store windows are very well known for this.
Over time, the glass will 150% thicker at the bottom than the top, in twenty years.
never heard that about glass
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post #9 of 16 (permalink) Old Jun 29th, 18, 05:00 AM
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Re: Thermostat drip

I had to replace the water neck this year because it leaked from the top not from the gasket or bolt area . Never have seen this before , fairly new ,not cracked very strange
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post #10 of 16 (permalink) Old Jun 29th, 18, 08:33 AM
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Re: Thermostat drip

Some file work on the manifold seating area or the housing may do the trick. When you file cover the are with machinist dye or black magic marker. file across the surface at an angle, one hand on each end of the file flat strokes, one file stroke right to left
and next left to right. when the dye is finally gone you should have a flat surface.

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post #11 of 16 (permalink) Old Jun 29th, 18, 08:50 AM
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Re: Thermostat drip

I had great success with the Fel-pro molded rubber gasket that is similar to the Mr. gasket unit.

Rob

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post #12 of 16 (permalink) Old Jun 30th, 18, 03:37 PM Thread Starter
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That gasket and or waterneck one or the other fixed my problem. No more dribble. 👍

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post #13 of 16 (permalink) Old Jun 30th, 18, 03:56 PM
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Re: Thermostat drip

Quote:
Originally Posted by flat tire View Post
never heard that about glass
Everett is correct. Glass is a amorphous solid. Look at a historic home with original glass. Youíll see what Everett is talking about.

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post #14 of 16 (permalink) Old Jun 30th, 18, 05:37 PM Thread Starter
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I heard many years ago that glass was in a constant state if movement. Totally forgot about that.

X-77 keith
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018
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post #15 of 16 (permalink) Old Jul 1st, 18, 06:37 PM
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Re: Thermostat drip

I file the cover flat and use the permatex for thermostats, it is silver and blends right in on alluminum intakes. I use no gasket and a light coat on each side, just barely snug the bolts by hand, enough to see the first sign of compressing the permatex, wait 60 minutes and snug down with the wrench, the sealer is what seals, not the torque of the bolt, I have never had one leak using this method

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