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Thermostats
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Rootes75



Joined: 30 Apr 2013
Posts: 2744
Location: The Somerset Levels

PostPosted: Tue Feb 26, 2019 2:22 pm    Post subject: Thermostats Reply with quote

After taking my Commer lorry out for a run up of the engine she boiled up. I want to replace the thermostat but this far I am having trouble.
The Commer 5/7 ton Parts list give the thermostat as 'BGA.5551', I have phoned around my usual helpful contacts and they haven't heard of the number!?!

Does anyone on the forum know of someone to recommend for help finding one?
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1937 Ford 7w
1937 Hillman 80
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1947 Hillman Minx
1955 Hillman Minx Mk8
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MVPeters



Joined: 28 Aug 2008
Posts: 666
Location: Northern MA, USA

PostPosted: Tue Feb 26, 2019 3:14 pm    Post subject: Reply with quote

I think that's what I'd call a 'universal' 'stat. It should be readily available in 175 185 or 195 degree versions.
Does it look like this? https://www.amazon.co.uk/BGA-CT5551-Thermostat/dp/B00AN5WUH8
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Rootes75



Joined: 30 Apr 2013
Posts: 2744
Location: The Somerset Levels

PostPosted: Tue Feb 26, 2019 3:39 pm    Post subject: Reply with quote

No it doesn't look like that, look at he picture below its item 197.


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1937 Hillman 80
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1947 Hillman Minx
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MVPeters



Joined: 28 Aug 2008
Posts: 666
Location: Northern MA, USA

PostPosted: Tue Feb 26, 2019 4:17 pm    Post subject: Reply with quote

Oh!

That's the bellows style - boat engines often used them.
I suspect the later wax-stat style will fit.

(W-S-M at Easter, do you think?)
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roverdriver



Joined: 18 Oct 2008
Posts: 1146
Location: 100 miles from Melbourne, Victoria, Australia

PostPosted: Wed Feb 27, 2019 7:15 am    Post subject: Reply with quote

I agree that a standard bellows one will probably fit, however a word of caution- while the older units could fail, they would fail 'open' but I do believe that some modern ones can fail 'closed' and that could be disastrous to ones engine.
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lowdrag



Joined: 10 Apr 2009
Posts: 1250
Location: Le Mans

PostPosted: Wed Feb 27, 2019 7:22 am    Post subject: Reply with quote

That sir, is very true. I had a stock of old bellows stats but stupidly let friends have some over the years and am now down to my last spare which I am guarding preciously. It was all very well stuffing cardboard in front of the radiator to keep the water warm, but if the new ones fail then you're in trouble.
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Rootes75



Joined: 30 Apr 2013
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Location: The Somerset Levels

PostPosted: Wed Feb 27, 2019 10:40 am    Post subject: Reply with quote

Do I take it that like normal thermostats it cannot be repaired but has to be replaced?
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badhuis



Joined: 20 Aug 2008
Posts: 1095
Location: Netherlands

PostPosted: Thu Feb 28, 2019 1:26 pm    Post subject: Reply with quote

Would be pretty difficult to repair. The bellows type is still available new - but at a cost. I bought one for my TR4 two years ago because at that engine, the bellows type opens up (or closes down) a water port which would not happen with a normal type of thermostat.
I would try a normal thermostat first to see what happens.
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Rootes75



Joined: 30 Apr 2013
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Location: The Somerset Levels

PostPosted: Fri Mar 01, 2019 11:56 am    Post subject: Reply with quote

Will a normal AC type thermostat do the same job?

With the bellows type as long as the outer diameter where it seats is the same could I just get any replacement bellows type, I have seen a few on ebay?
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1937 Ford 7w
1937 Hillman 80
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1947 Hillman Minx
1955 Hillman Minx Mk8
1950 Commer R541
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MVPeters



Joined: 28 Aug 2008
Posts: 666
Location: Northern MA, USA

PostPosted: Fri Mar 01, 2019 12:12 pm    Post subject: Reply with quote

Yes, I believe so.

I imagine the Commer does not have a pressurized system.
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Rootes75



Joined: 30 Apr 2013
Posts: 2744
Location: The Somerset Levels

PostPosted: Sun Mar 03, 2019 4:28 pm    Post subject: Reply with quote

After a fight got the thermostat housing off, its very awkward. The thermostat is well seized so obviosly needs replacing.
The problem though is the retaining ring, item 199 in the diagram, is a push fit and hold the thermostat in position. It is rusted solid and seized in place. Plenty of ease it oil applied and will try some heat on it next weekend.
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1937 Hillman 80
1946 ERF C.I.5
1947 Hillman Minx
1955 Hillman Minx Mk8
1950 Commer R541
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