Need fast answer: Gasket sealer on thermostat gasket, yes or no? - Honda-Tech


Need fast answer: Gasket sealer on thermostat gasket, yes or no?

Reply
 
 
 
Thread Tools Search this Thread
Old 07-04-2008, 10:35 AM   #1
Honda-Tech Member
Thread Starter
 
Ohmster's Avatar
 
Join Date: May 2007
Location: Pompano Beach, FL, USA
Posts: 137
Default Need fast answer: Gasket sealer on thermostat gasket, yes or no?

It is July 4th and the car is under the carport cooling off. I want to replace the thermostat and thermostat gasket today and don't know whether or not to put blue silicone gasket sealer on the O-ring type thermostat gasket or not. The car is a 1995 Honda Civic EX. The gasket really looks like a rubber O-ring with a small rubber flange on the inside of it with small rubber pegs to line it up properly. I have a green stain running down the back of the engine and need to add water to the cooling system every two or three days or the engine will overheat. The stain begins under the thermostat housing, car has 142K miles, and to the best of my knowledge, never has a wrench been put to the thermostat housing bolts. Time to change the gasket I guess and might as well throw in a new thermostat while I am at it.

So, do I need to put blue silicone gasket sealer on this gasket or since it is a neoprene rubber O-ring, just clean area and skip the gasket compound? I want to do this in the next few hours, a quick answer and I would be much obliged. Thank you.
Ohmster is offline   Reply With Quote
Old 07-04-2008, 12:28 PM   #2
Junior Member
 
93egred's Avatar
 
Join Date: May 2008
Location: California, Maryland, U.S.A
Posts: 28
Default Re: Need fast answer: Gasket sealer on thermostat gasket, yes or no? (Ohmster)

DO NOT PUT ANYTHING EXCEPT THE GASKET ITSELF IN.....NO GASKET MAKER NOTHING.....just clean both the surfaces off the gasket will be touching very well
93egred is offline   Reply With Quote
Old 07-04-2008, 02:39 PM   #3
Honda-Tech Member
Thread Starter
 
Ohmster's Avatar
 
Join Date: May 2007
Location: Pompano Beach, FL, USA
Posts: 137
Default Re: Need fast answer: Gasket sealer on thermostat gasket, yes or no? (93egred)

Ooops! Wish I had seen this earlier. Well, I think we found the leak, at wast!

Had water disappearing from the cooling system and car would overheat every 2-3 days with low water. Saw a green stain originating under thermostat housing and ran down back of engine. Bought new gasket and thermostat. Took off old one today and guess what? No gasket and no thermostat! Just a bead of black silicone all the way 'round the housing and that was leaking. You could see the stain of hard water scale on the back side of this "make your own gasket".

I brushed off the scale with a steel brush and cleaned it up good with acetone and then put in a new thermostat and gasket. Took a while to figure out how the gasket and thermostat go in since there was no old one to study when I took it apart. Seems that the thermostat slides into a groove in the O-ring gasket and that entire assembly slides right into place in the engine block. Since I did not get my answer in time, I put a thin bead of blue silicone on the gasket, installed it, then another thin bead on the housing and installed that. Bolted it on tight, put everything back, and filled with coolant. The old housing was not too corroded or anything and I got most all of the scale off so I probably could have skipped the silicone. Since I did not know I figured that it cannot hurt and that blue stuff is really good stuff so put it on, won't hurt anything.

We will see now if it leaks anymore or not. Here are some pictures to show you what some knucklehead installed instead of a gasket. Look how the water ran right under this "gasket" and out the engine.



Ohmster is offline   Reply With Quote
Old 07-04-2008, 06:53 PM   #4
Honda-Tech Member
 
CivicSpoon's Avatar
 
Join Date: Jul 2004
Location: Central, NY, USA
Posts: 1,346
Default

I'm pretty sure I put some silicone sealant stuff on mine when I replaced it (Mitsubishi Silicone to be exact, their version of Hondabond). It's been on there for a year or 2, and I've never had a problem with it.
CivicSpoon is offline   Reply With Quote
Old 07-04-2008, 10:43 PM   #5
Honda-Tech Member
Thread Starter
 
Ohmster's Avatar
 
Join Date: May 2007
Location: Pompano Beach, FL, USA
Posts: 137
Default Re: (CivicSpoon)

Yeah, that's what I want to hear, thanks dude. Didja see the pictures? No doubt the water was coming out, right there on the back of the pure silicone make believe gasket. Thanks for the input!
Ohmster is offline   Reply With Quote
Old 07-04-2008, 10:52 PM   #6
Honda-Tech Member
 
ef_88_hatch's Avatar
 
Join Date: Jul 2006
Location: OR, USA
Posts: 96
Default Re: (Ohmster)

all you need to do is clean the housing and the head really good put a very small amount fo sealer on the housing just to hold the rubber seal in place and be sure not to over tighten or it will leak.
ef_88_hatch is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Gaskets, Seals, & O-Ring's Oh my! B20VSi2000 All Motor / Naturally Aspirated 1 05-16-2016 05:38 AM
Having issues 02 Honda Accord 2.3l leaking water around tube on thermostat oN_Delay Honda Accord (1990 - 2002) 10 01-04-2016 09:32 AM
'95 Civic - small coolant leak, can I safely use a stopleak product, what kind? Ohmster Honda Civic / Del Sol (1992 - 2000) 0 08-08-2008 01:16 PM
Clacking noise after messing w/ oil pump rush2112 Tech / Misc 4 01-17-2008 04:55 PM
installing headers -- should I use gasket sealer? e_r_i_c_ Honda Accord (1990 - 2002) 9 03-23-2006 08:04 PM


Tags
civic, clean, del, gasket, honda, housing, put, replacement, replacing, sealant, sealer, show, sol, tech, thermostat

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 10:36 AM.