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Author Topic:   Thermostat housing/gasket keeps leaking slightly
rockafellz
Gearhead

Posts: 1291
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 01-29-2003 12:20 PM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
Hey Guys,

As some of you know i've had the new motor in since the end of summer 2002 and it's been great. Just very little minor issues like fuel pressure gauge, etc.etc.

I've got an Edelbrock Torker II intake and i'm using a Ford OE thermostat housing (cast iron, I believe) and using Fel-Pro thermostat housing gasket.

After running the car for a while and letting it cool over night, I always notice a very small puddle right underneath the gasket section of the housing. I feel the housing with my fingers and i'm certain the leak is coming from there. Again, it doesn't leak when it's warming up or being run, only when I lift the hood up the next day.

Alex made a good point in the "cast iron vs. aluminum" post about aluminum and cast iron not being good for the street. Would this little cast iron thermostat housing apply the same way? Cause i've changed the Fel-pro gaskets twice now and it's stumbled me until I read Alex's post. I just want to confirm before I spend $30 on a aluminum housing.

Thanks in advance.

Erik

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1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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capri man
Gearhead

Posts: 3385
From: doerun, ga.
Registered: Nov 2000

posted 01-29-2003 12:23 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
did you use any sealer on it? also make sure that it isnt the little bypass hose. they will fool you sometimes.

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mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141

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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 01-29-2003 12:25 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Erik make sure the hoses aren't cracked and are thight.
The little return hose my be leaking.
Do you use any sealer on the gasket too.I always use alittle sealer on both sides of the gasket.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 01-29-2003 12:27 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Mike I didn't even see your post there,hey we think alike.I'm not sure if thats good or bad.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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rockafellz
Gearhead

Posts: 1291
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 01-29-2003 12:42 PM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by capri man:
did you use any sealer on it? also make sure that it isnt the little bypass hose. they will fool you sometimes.


I'm sorry, I forgot to add that I used Hi-Temp sealer the orange kind. The brand start with a T or P. I want to say Tempex or Playtex or something. I used it on both sides of the gasket. Nice even coating.

Both the hoses are new and nice and tight.

Thanks in advance.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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capri man
Gearhead

Posts: 3385
From: doerun, ga.
Registered: Nov 2000

posted 01-29-2003 01:14 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
its down right scary SCOOP!!!

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mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141

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Hans olsson
Gearhead

Posts: 293
From: Sweden
Registered: Apr 2000

posted 01-29-2003 02:00 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
Did you check for a warped sealing surface on the thermostat housing?

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  • 71 Mach1 351c
  • E/SA 11.89-110 mph
  • F/SA 11.76-111 mph

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 01-29-2003 03:01 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
That's always been a common problem on Windsors with aluminum intakes.
You just have to use a liberal amount of silicone with the gasket, snug it down well, and let it dry over night before adding any coolant.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
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The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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