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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> Changed thermostat & gasket, now leaks
Post Info TOPIC: Changed thermostat & gasket, now leaks
Leo2+2


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Changed thermostat & gasket, now leaks
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I just changed the thermostat & gasket on my 67 Parisienne and it leaks from the thermostat housing when engine runs. I just tightened it to what I think is the safest I should.

 

Any opinions for solutions? 



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan
beaucarlo


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i'm thinking the housing is warped....looks like you have to remove it and place it in a vice and draw-file it until its flat again

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bob lewis
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Brian


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I would take the housing and sand it on a flat surface to see if it is warped.
If not take a file (sometimg straight) and wrap sand paper around and sand intake to see if it is warped.

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Surrey, BC
4SPEED427


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Who's gasket did you use on the housing?

It all has to be real nice and clean. Also, was the housing pitted in the gasket area?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
oshawacliff


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check the clamp on the housing. use a double gasket as a test. check for deteriation of the metal housing.

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Cliff

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65Camino


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I always sand mine on a belt sander before using it.

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73SC


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Iron intake 25 to 30 ft-lbs.

Aluminum intake 15 ft-lbs. 

There's always silicon vs. gasket.



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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
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JC2+2


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I had that issue as well. I draw filed the housing and it would seal great cold but warp and leak warned up. Then rechecked it and seamed straight but cold again. Tried using silicone but the warp broke the silicone seal. I finally bought a new cast iron one and period correct. I think Dorman makes it. It was cheap. Under $20.

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'68 Parisienne 2+2 Convertible Matador Red (Resale Red but not for sale).
Mike Ward MB


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That blue or red gasket compound fixed me up. I had a leak at my housing soon after the engine ran a little on the warm side. New gasket wouldnt do it. Cleaned it up, applied a bead of the gasket compound, no more leak!



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Leo2+2


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The gasket is new, I bought it at an auto parts store which I use whenever I don't want Canadian Tire parts.

 

The housing is not pitted not warped however I didn't sand anything. I will try that on the weekend with more time and report back.

 

thanks.



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan
davepl


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I doubt its the issue, but one thing people forget is that RTV has a shelf life. The V, for vulanizing, goes away with time and the stuff doesn't cure or set properly anymore. I was just taking apart an old Lincoln that was probably rebuilt 5+ years ago and some of the RTV was still sticky, clearly too old.


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Prefectca


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Also make sure that the recess that the thermostat sits in is really clean. If not the thermostat will not let the housing seat properly on the intake manifold.

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Leo2+2


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All done, like a charm now.

I took it all apart, cleaned and sanded on the manifold and hose side, cleaned it all again, used some blue gasket compound and put it back together. I borrowed a torque wrench from a friend and followed the shoppers manual instructions to tighten to 28 lbs and no more leaks. Drove the car this afternoon before the rains came, heating inside is perfect too.



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan
73SC


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A torque wrench is one of the "must have tool". I know they can be pricey but you can't go wrong when you follow the factory specs on anything from wheel nuts to thermostat housings. A neighbour has one of the new snap on digital tools, I think he paid $700 or so but boy was a nice wrench



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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
68 Grande


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$700, Yikes! I bought a 3/8 torque wrench from Princess Auto for $20. I have a better quality 1/2 inch drive from Cdn Tire that was on sale for about $70. They seem to do the job. Yes, tools can be expensive for the "quality" ones but having the proper torque is a must.

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Leo2+2


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I understand the importance of the right tool but $700.00 on a torque wrench is too much for me. We can really go overboard ... then would have to explain stuff to the wife :(

 



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"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

'67 Parisienne 2+2 - red

'01 Montana            - red

'06 Buick Allure

'12    Japanese minivan
long stroke


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65Camino wrote:

I always sand mine on a belt sander before using it.

 Excellent idea.



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65wagon


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went away from lotions and potions, im now running a silicon gasket in ali frame I think mr gasket makes it, I have used sheet silicon before to seal bad leakers.



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67Poncho


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I use a sanding block with 80-100 grit and clean..  This is the only gasket I use. a little thicker with a bead of sealant already applied..

D27058B3-A786-4513-A1BF-F3DB4199C146.jpeg

6758D5A9-E496-4538-8F77-9FAF9C6AF840.jpeg

 

 

 



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Vincent Jr.
73SC


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67Poncho wrote:

I use a sanding block with 80-100 grit and clean..  This is the only gasket I use. a little thicker with a bead of sealant already applied..

D27058B3-A786-4513-A1BF-F3DB4199C146.jpeg

6758D5A9-E496-4538-8F77-9FAF9C6AF840.jpeg

 

 

 

 That is a nice looking product and true to GM mass production it will work with small and big blocks. I'm taking note of that PN. Thanks 67 Poncho



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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
65Camino


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long stroke wrote:
65Camino wrote:

I always sand mine on a belt sander before using it.

 Excellent idea.

 Thanks !!



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