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#1
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Leaking thermostat housing
I have been fighting a coolant leak at the thermostat housing for a few years. I discovered a couple years back that the housing was not flat. I attempted to flatten it on a bench belt sander and it held for a short time. I then purchased a new housing and again it held for almost a year but failed again a week ago.
What is the best wat to seal the housing to the manifold? gasket? no gasket using gasket maker? gasket with gasket sealer?
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1969 Firebird 350 convertible, t-5, Carousel Red 2008 Solstice GXP 5speed manual, Sly 2008 Grand Prix, Ink Slate, Winter daily driver 2009 G8, Switchblade Silver, summer daily driver |
#2
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I like the blue gaskets with the sealer on.
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#3
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Mostly the whole key is to fight the tendency to want to tighten the piss out of the two bolts if it’s not a cast iron housing, which most are not.
At one point in time the company Everco use to offer for all America made cars the choice of a replacement cast iron or Aluminum T-stat housing, i do not know if they still do. The Aluminum ones just don’t have enough flange thickness to not warp over time and in terms of this issue the thicker the gasket is , the more and the sooner it will warp, and this is compounded if the gasket is of the type that shrinks with age! If both gasket surfaces are in great shape then a thin gasket with a swipe of sealer is best!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 05-30-2021 at 02:34 PM. |
#4
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I have used the blue paper gasket with the permatex aviation gasket sealer with good success.
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-Jason 1969 Pontiac Firebird |
#5
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This is the best gasket I can find nowadays. Most are slotted universal types. This works well and is a quality gasket as you'd expect from Fel Pro. I coat the crossover and the water neck with aviation permatex. Never had one leak with this method. FWIW
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'65 Tempest 467 3650# 11.30@120.31 |
#6
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This;
https://www.permatex.com/products/ga...-no-2-sealant/ with the blue gasket. #3, as mentioned above, my 2`nd choice. |
#7
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My aftermarket aluminum intake with new aluminum water neck seeped. The factory style bolts (one is a nutted stud to hold the alternator bracket) were bottoming out right at the point you pulled them snug so there wasn't enough clamping pressure. I installed 2 full- thread studs and nuts. No more leak.
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Triple Black 1971 GTO |
#8
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Quote:
"Correct" fastener. Same deal with the Valve Cover Bolt Fasteners that some say leak water. Permatex on those too. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#9
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I use the chrome water neck with the rubber o ring. Zero issues. Also important to ensure intake thermostat housing area is flat and not full of rust pits.
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