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pitted thermostat housing seat


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chas
User

Dec 8, 2016, 9:44 PM

Post #1 of 20 (724 views)
  post locked   pitted thermostat housing seat  

94 toyota 22re pitted aluminum thermostat housing cup seat where the thermostat sits in the cup with a rubber gasket around the thermostat.
I looked around at the auto parts stores. I need to use something that is gasoline, oil, antifreeze resistant and take the heat with a 180 thermostat.
I would like to repair the seat cup proper without using goop, silicon or anything sloppy. Goop or silicon wont work for this.
I was thinkin about using JB weld with several applications over a few days and let it set for 24hrs.
It's maybe the only thing i could come up with that might work for this application.
what do you guys recommend to build up the aluminum thermostat housing seat that has been lost to pitting and time?
These pics are close enough to give you an idea how the thermostat is designed. The thermostat sits in the cup with the rubber gasket around the lip of the thermostat. The top housing is flat compressing the rubber gasket in the seat with (2) 12-14mm bolts. The cup seat has been worn down from pitting and time.

Link deleted ............... not allowed


(This post was edited by Hammer Time on Dec 9, 2016, 6:19 AM)


Tom Greenleaf
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Dec 9, 2016, 1:29 AM

Post #2 of 20 (709 views)
  post locked   Re: pitted thermostat housing seat  

Your picture - may not show directly>
>
You can get a replacement for the top part/side part of them (ask for "housing") or if clean and dry and pits not out of control the Permatex brand gasket sealer and maker product will tolerate all the normal temps that would be there.


I'm not going to look it up but why 180F thermostat? Almost everything really wants and needs over 190F (195F most common) for engine to run properly,


T



(This post was edited by Tom Greenleaf on Dec 9, 2016, 1:35 AM)


Hammer Time
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Dec 9, 2016, 6:20 AM

Post #3 of 20 (692 views)
  post locked   Re: pitted thermostat housing seat  

Things like that are not repaired. The component is replaced.

I'm sure a machine shop may be able to fix it correctly but it would be cheaper to replace it.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



kev2
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Dec 9, 2016, 7:16 AM

Post #4 of 20 (682 views)
  post locked   Re: pitted thermostat housing seat  

DORMAN replace housings, cost less than time spent here debating it...


http://www.dormanproducts.com/...&SEName=902-5000


Hammer Time
Ultimate Carjunky / Moderator
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Dec 9, 2016, 7:24 AM

Post #5 of 20 (677 views)
  post locked   Re: pitted thermostat housing seat  

I suspect his issue is with the intake manifold side of things.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Dec 9, 2016, 7:37 AM

Post #6 of 20 (670 views)
  post locked   Re: pitted thermostat housing seat  







Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Dec 9, 2016, 7:38 AM)


kev2
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Dec 9, 2016, 10:20 AM

Post #7 of 20 (648 views)
  post locked   Re: pitted thermostat housing seat  

OOPs


I will read and improve comprehension
I will read and improve comprehension
I will read and improve comprehension
I will read and improve comprehension


chas
User

Dec 12, 2016, 4:59 PM

Post #8 of 20 (621 views)
  post locked   Re: pitted thermostat housing seat  

 

In Reply To

that looks like a powder coating on the intake manifold and thermostat outlet. can i get that in small spray can? I would like to prep the area then spray in the seat and around the thermostat to protect it from more corrosion.
btw, i cant find a way in the editor to increase the type size. where is it?



(This post was edited by chas on Dec 12, 2016, 4:59 PM)


Hammer Time
Ultimate Carjunky / Moderator
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Dec 12, 2016, 5:27 PM

Post #9 of 20 (611 views)
  post locked   Re: pitted thermostat housing seat  

Powder coating is not a spray product. Automotive parts are not powder coated.

That manifold looks like just stripped clean aluminum.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Dec 12, 2016, 5:48 PM

Post #10 of 20 (601 views)
  post locked   Re: pitted thermostat housing seat  

Looks like the picture was taken off the server it was linked to. That manifold may have been bead blasted.


As HT stated a machinist might be able to repair it by welding and machining a new surface. You also might get lucky and find a good used one.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Tom Greenleaf
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Dec 13, 2016, 12:30 AM

Post #11 of 20 (589 views)
  post locked   Re: pitted thermostat housing seat  

Chas - How bad is the pitting? Saw the pic in a the link before removed didn't help as it wasn't yours. Post one of yours. Many are dirty - some pits -and so what you just clean that off, grease with water proof grease and go or the sealer I mentioned.


Short of a crack I can't believe this is that much trouble,


Tom



chas
User

Dec 13, 2016, 7:52 AM

Post #12 of 20 (577 views)
  post locked   Re: pitted thermostat housing seat  


In Reply To
Chas - How bad is the pitting? Saw the pic in a the link before removed didn't help as it wasn't yours. Post one of yours. Many are dirty - some pits -and so what you just clean that off, grease with water proof grease and go or the sealer I mentioned.


Short of a crack I can't believe this is that much trouble,


Tom>>>>>>>>>>>>>>>>>>

chas>>>>>cant post any pics. Dont have a digital camera. I did clean it out. That was the first thing i did to get an idea how bad it is. The previous owner used some kind of greasy goop. Cleaned out the junk, scrapped off the rot and sanded a little to get it smooth. The pitting and wear is bad enough creating a problem to get a seal when the top housing with the (2) bolts that compress down on the o-ring in the seat. It was leaking a little. Been using teflon tape wrapped around the o-ring about 10x to build it up enough to get a seal. Teflon tape works but i would like to get a better fix on it. The cup seat is worn down from the pitting and corrosion. I dont think it will that much of a problem either. Just asking for suggestions before i make a decision. Be nice if others in here chimed in with some ideas.



(This post was edited by chas on Dec 13, 2016, 7:57 AM)


Tom Greenleaf
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Dec 13, 2016, 8:17 AM

Post #13 of 20 (567 views)
  post locked   Re: pitted thermostat housing seat  

Even with an excellent picture it would be difficult to be sure but this isn't usually (my own experience for ages) usually a real trouble spot. Something is all wrong like the part and the gasket isn't right in this case the rubber might not be good. Teflon tape is the wrong thing to use BTW for this.


If this is just pits and you can just scrape it clean, dry it with even a cloth soaked in like carb cleaner not to get that into coolant it would take the gasket maker I already spoke of.


Let that stuff dry a day if needed. If in a cold area working it will fail.


Idea for carrying on: Clean the surface with a small gasket scraper aptly named to do just that. You can make a decent one out of a junk screwdriver and a grinding wheel or buy one. Then you can see what you are really up against. Easy on alloys and aluminum as scrapers will gouge those metals and make a problem you didn't have.


Is the cover warped? Check with a straight edge. Understand you probably don't have tools up the butt so use a known straight edge of something and look. I mean the housing now that you can get a new one of. If that got overtightened, bent or something the fight with pits isn't it.


Just a warning with the gasket maker product(s) you may find I chose a name brand and would seek that. Use just enough no more if at all. Let it dry totally such that it isn't wet as once you put things together it isn't going to dry more.


Check that something - part or gasket you are using is correct. This is just seeming like too much trouble for you and my guess is there's a problem more than what you see,


T



chas
User

Dec 13, 2016, 9:23 AM

Post #14 of 20 (561 views)
  post locked   Re: pitted thermostat housing seat  

tom, you are going too far. The upper housing is good and the rubber o-ring is good. The problem is the cup seat. Its worn down from pitting and some corrosion. your suggestion of a home made gasket material from the parts store might work. Do you think the gasket material will take the constant submersion in anitfreeze and 180 plus temp?


(This post was edited by chas on Dec 13, 2016, 9:28 AM)


Hammer Time
Ultimate Carjunky / Moderator
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Dec 13, 2016, 10:37 AM

Post #15 of 20 (553 views)
  post locked   Re: pitted thermostat housing seat  

This really shouldn't be a big deal to seal. The factory designed this to seal using the O-ring around the stat only but you still have a flat surface outside of the O-ring. Why can't you just make a gasket for that surface to use in addition the to O-ring? You can use a thin coat of silicone on the gasket to seal any pitting in that area.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



chas
User

Dec 13, 2016, 10:53 AM

Post #16 of 20 (547 views)
  post locked   Re: pitted thermostat housing seat  


In Reply To
This really shouldn't be a big deal to seal. The factory designed this to seal using the O-ring around the stat only but you still have a flat surface outside of the O-ring. Why can't you just make a gasket for that surface to use in addition the to O-ring? You can use a thin coat of silicone on the gasket to seal any pitting in that area.>>>>>>Yeah, i dont think is a big problem. Im closing in on a decision. You gave some ideas and i have some ideas that should work for the long term fix. Thanks.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Dec 13, 2016, 11:52 AM

Post #17 of 20 (537 views)
  post locked   Re: pitted thermostat housing seat  

Chas - like we are on to this shouldn't be a hassle. The "toothpaste" tube of gasket maker you just use the least to fix tiny flaws. It can be removed if you don't like it and will tolerate all but exhaust temperature and there's a product for that too.


Refresh on the probably just two bolts or nuts to hold the cover down: If those ever were or you did way overtighten them you wrecked it! That's why I want you to check that it's not bent. If alloy and is on this it wouldn't bend back.


Take ruler, a metal one or put it on known glass, counter top - whatever it takes to know it doesn't have bent ears if you will on it. If you can slide paper or worse a credit card under it it's messed up.


On your side - this shouldn't be hard at all IMO but as always not there looking myself,


T



chas
User

Dec 13, 2016, 5:02 PM

Post #18 of 20 (525 views)
  post locked   Re: pitted thermostat housing seat  


In Reply To
Chas - like we are on to this shouldn't be a hassle. The "toothpaste" tube of gasket maker you just use the least to fix tiny flaws. It can be removed if you don't like it and will tolerate all but exhaust temperature and there's a product for that too.


Refresh on the probably just two bolts or nuts to hold the cover down: If those ever were or you did way overtighten them you wrecked it! That's why I want you to check that it's not bent. If alloy and is on this it wouldn't bend back.


Take ruler, a metal one or put it on known glass, counter top - whatever it takes to know it doesn't have bent ears if you will on it. If you can slide paper or worse a credit card under it it's messed up.

chas>>>>>ill probably get on it soon. Ill let you know what i did and if it worked. it'll be ok. thanks Tom, DS and HT for the suggestions.



VON
User

Sep 29, 2017, 12:58 PM

Post #19 of 20 (78 views)
  post locked   Re: pitted thermostat housing seat  

Chas, I've done this on Chevy trucks and it worked good w/ no problems for 15+ years. Buy a tube of Yamabond from a Yamaha motorcycle shop or online and follow the directions on the tube. On one badly pitted thermostat housing I put the Yamabond on thicker and let it set up until hard (3-5 days) and lightly resurfaced the housing on a piece of glass with 220 sandpaper until flat, but not sanding all the way through the Yamabond. Start with the housing surfaced as flat as you can before putting on the YB.


Hammer Time
Ultimate Carjunky / Moderator
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Sep 29, 2017, 1:16 PM

Post #20 of 20 (76 views)
  post locked   Re: pitted thermostat housing seat  

This thread is nearly a year old. Please do not reply to old threads.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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