Thermostat gasket - Mustang Evolution

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Old 05-06-2014, 08:55 AM   #1
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Thermostat gasket

Hey dudes,
I keep on having a problem making a good seal,
Ive tried with RTV on its own.
Ive tried with an oem gasket on its own.
Ive tried with oem gasket and a bit of RTV.

Can someone give me their thermostat gasket 101, thanks

I hate coolant everywhere!
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Old 05-06-2014, 02:22 PM   #2
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Did u check to make sure it is not warped, or cracked? Rub it on a block with sandpaper and look for high spots.
Make sure mating surfaces are absolutely clean, 100%. Use rubbing alcohol or equivalent to clean.
Just use the gasket after that. Should be home free.
Troy
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Old 05-06-2014, 05:06 PM   #3
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Thanks for your input man
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Old 05-07-2014, 12:18 AM   #4
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If you have a wire wheel you can also use that. I have problems with it sometimes also. I just clean it up nice, put the rtv as evenly as possible on the lower plenum then put the thermostat in the waterneck and then the gasket over the thermostat. For 1 it helps it hold it on the waterneck and for 2 the indent on the waterneck is made for the gasket to go over it.

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Old 05-07-2014, 07:48 AM   #5
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The tstat itself has a problem staying put in place on the 5.0s since they are sitting at 90 degrees. Every single one I've done likes to fall down a little when you are putting the coolant neck on and wedge itself between the neck and the intake on the bottom creating a gap. Your best bet is to LIGHTLY coat a few spots on the tstat with RTV after you make sure the intake side is completely clean/dry and stick it on there so it stays. Then install your gasket and neck.
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Old 05-07-2014, 08:14 AM   #6
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Got it done
Used the housing of my old engine,
The one I was trying to use had seen its day.. Wasnt square.

I cleaned everything up sexy,
Ended up using oem gasket and some gasket sealer.

The lip on my 95 thermostat housing where the stat actually sits was a bit deeper than my 93 housing.

Thanks dudes.
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Old 05-07-2014, 09:14 PM   #7
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You can just run with no tstat 😜
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Old 05-08-2014, 07:26 PM   #8
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That's what I'm doing, stays at a good 160-170. 180 max if I'm sitting at a stop for a long time. I'm just doing this to clean out the system, used vinegar in it for a couple days

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Old 05-09-2014, 10:33 AM   #9
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You don't want any lower than 180. Won't let the engine get up to proper operating temperature.
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Old 05-09-2014, 12:44 PM   #10
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+1
Thought that was the case.
Thanks

Now im trying to figure out a high idling issue,
Was set and timed and was idling around 900

Now it would drop off from 1100 which is too high

Gonna disconnect battery for an hour, then reconnect and see if it makes a change,
Otherwise im gonna check the iac, tps, maf
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Old 05-09-2014, 12:58 PM   #11
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Quote:
Originally Posted by scottydsntknow View Post
You don't want any lower than 180. Won't let the engine get up to proper operating temperature.
+1 on what Scotty said.

Also try this for the idle problem.....

http://sbftech.com/index.php/topic,1031

Also check for vacuum leaks as that will have you chasing your tail as to why you idle fluctuates.
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