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Upper Thermostat Housing.


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#1 Indy Orange

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Posted 29 March 2021 - 11:34 AM

Hi all, is there any way this can be repaired and used? resleaved ?

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#2 76lxhatch

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Posted 29 March 2021 - 01:20 PM

I'd cut it down a bit and bore the inner a touch for a more even surface, then make a new sleeve on the lathe that presses inside and has a step to match the outside. The inner diameter would end up slightly smaller but that won't make much difference and you may need a little epoxy to ensure its leak-free if the pitting is really bad. Would be hard to tell the difference especially once you put a hose on it.



#3 Indy Orange

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Posted 29 March 2021 - 03:09 PM

Were they originally cast iron?

Edited by Indy Orange, 29 March 2021 - 03:10 PM.


#4 claysummers

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Posted 29 March 2021 - 03:37 PM

Always been pot metal. EH were different in that the neck points up to suit the old style radiator. HD or HR on basically same radiator through to HZ 6 cylinder I reckon. They are a consumable item.

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#5 Indy Orange

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Posted 29 March 2021 - 04:06 PM

Seem to have a lot of aluminium in them.

#6 Indy Orange

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Posted 29 March 2021 - 04:27 PM

Maybe act as an anode as well.

#7 73SUNBURSTEXYOUWON

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Posted 29 March 2021 - 07:17 PM

Always been pot metal. EH were different in that the neck points up to suit the old style radiator. HD or HR on basically same radiator through to HZ 6 cylinder I reckon. They are a consumable item.
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It would be nice though if a Holden Branded Part housing could be saved by a stainless steel sleeve.

In Brisbane try BHSS Capalaba, one can only ask. Understandably though, will the parent metal hold up to the task?

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#8 claysummers

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Posted 29 March 2021 - 08:24 PM

Thanks for the photo Jaso.

Guy I know built a crucible in his shed and managed to cast some alloy propulsion blades for one of those scuba things you hold with the headlight and get pulled along. He used old hard drives as the source metal. If you started reproducing the thermo housings I wonder if the copyright lawyers would come after you.

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#9 claysummers

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Posted 29 March 2021 - 08:27 PM

Would have to sleeve with metal of similar expansion coeficient or it would fail when engine gets hot.

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#10 73SUNBURSTEXYOUWON

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Posted 29 March 2021 - 09:11 PM

https://www.ebay.com...L-/183825249360

#11 Indy Orange

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Posted 29 March 2021 - 09:12 PM

Thanks guys ! May be more trouble than it's worth trying to salvage it .

#12 73SUNBURSTEXYOUWON

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Posted 29 March 2021 - 09:16 PM

Wall art.

#13 76lxhatch

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Posted 30 March 2021 - 04:34 AM

Depends whether you have some material and machinery on hand or not. If it were me I'd use some free machining aluminium rather than stainless.



#14 S pack

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Posted 30 March 2021 - 06:26 AM

https://www.ebay.com...L-/183825249360


Junk.



#15 73SUNBURSTEXYOUWON

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Posted 30 March 2021 - 12:16 PM

Junk.


Haha, it looked better than what the OP had...
Hang em all on the wall. :)

#16 ljv8

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Posted 30 March 2021 - 12:20 PM

That ebay link shows similar items other people brought, and shows the Rare Spares repro thermo housings.  A good original one that isn't corroded is always preferred but noticed in the parts list and comments it has an o-ring rather than a gasket.  Interesting incorporating a design change, funny thing is the Rare Spares site makes no mention of an o-ring.  I don't think Holden did a design change to the late blue 6's with an o-ring, but I could be wrong.  This ebay seller it says sold 61 of them, so would have to assume they seal okay. 

 

Might be a good alternative if you can't fix yours or find a good original one, that doesn't cost a gazillion dollars.

 

https://www.ebay.com...675.c101224.m-1

 

 

https://www.rarespar...202-lc-lh-6-cyl

 

 

 



#17 claysummers

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Posted 30 March 2021 - 02:03 PM

No, O ring was after market only. Not hard to get the upper housing that looks right, apart from the cast script. Maybe a skilled tig welder could build up an original one.


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#18 yel327

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Posted 30 March 2021 - 04:30 PM

Just make a mould off an original one for the text, and add it to a blank one using bog or putty or whatever works. I’ve seen people put red 138’s into old Holdens using a 186 or 202 block with the 186/202/3.3 ground off and 138 added using bog letters out of a mould.

#19 claysummers

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Posted 30 March 2021 - 07:48 PM

Dodgy pricks. They would need to fiddle the engine numbers as well.

Surely wouldn't last?

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#20 yel327

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Posted 30 March 2021 - 07:57 PM

Yes, one I saw years ago used a late blue or black block with unmachined engine pad, just machined it and I think got allocated a Police number. If you use the bog with fibreglass in it, it will stick forever. Try getting it off anything once it’s set!

#21 claysummers

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Posted 30 March 2021 - 08:06 PM

Yes, on the thermo housing I meant.


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#22 Indy Orange

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Posted 30 March 2021 - 08:16 PM

Unfortunately a lot of the original Holden cast ones available on eBay are rooted,and often don't show pics of the inner hose attachment.

#23 73SUNBURSTEXYOUWON

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Posted 07 May 2022 - 12:25 PM

The thermostat top cover i have, i picked up to give it a cleanup and noticed the inlet opening larger than the internal opening.
I was thinking maybe, this may restrict coolant flow a little, as the internal opening had a lip buildup of casting metal, so i gave it a slight port job :).

Even to feel along the inside of inlet tube, it has a slight tapered feel to it. Not that its a big deal, just merely an observation, i thought worth sharing.


Admittedly this is not a branded/part numbered top cover.(cheap chinese junk)

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#24 Bruiser

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Posted 07 May 2022 - 05:26 PM

You'll get a few more years out of that one.
Did you get flow bench results?

#25 73SUNBURSTEXYOUWON

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Posted 07 May 2022 - 09:42 PM

Hahahaha,flow = +0.1 lpm @ full thermostat lift. :)




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