Thermostat rating.

for those with Series MM sidevalve cars produced between September 1948 and February 1953
Mick Lynch
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Thermostat rating.

Postby Mick Lynch » Tue Dec 07, 2021 8:55 pm

The thermostat that was removed was rated at 195°F (which is about 91°C for cash). Does this seem right? The engine is a North American spec USHM3 with an induction heater.

Do any official Nuffield publications have this info?

Thoughts.

JOWETTJAVELIN
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Re: Thermostat rating.

Postby JOWETTJAVELIN » Tue Dec 07, 2021 11:03 pm

It could be a 'winter' thermostat installed for the very cold winters.
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Mick Lynch
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Re: Thermostat rating.

Postby Mick Lynch » Thu Dec 09, 2021 11:15 am

‘Winter’ would make sense as the last time the car was verifiable on the road was December 1983.

What would ‘summer’ thermostat be? Summers here typ 22° to 28°

philthehill
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Re: Thermostat rating.

Postby philthehill » Thu Dec 09, 2021 1:44 pm

The thermostats in the links below will be suitable for your summers

https://www.ebay.co.uk/itm/383514730712 ... Sw08Feppz-
or
https://www.ebay.co.uk/itm/282650678677 ... 101224.m-1

I would suggest that the 82 degree thermostat is the most suitable.


JOWETTJAVELIN
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Re: Thermostat rating.

Postby JOWETTJAVELIN » Sat Dec 11, 2021 2:49 pm

For a side valve engine it should be a bellows stat, NOT a waxstat as linked.
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philthehill
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Re: Thermostat rating.

Postby philthehill » Sat Dec 11, 2021 3:17 pm

Both types of thermostat are suitable - so long as the thermostat fits the hole it does not have to be a bellows type.
The thermostat (either wax or bellows/alcohol) fitted to a 'A' Series engine requires a 54mm wide recessed seat.
Before the wax-stat the majority of thermostats were of the bellows type including those fitted to the early 'A' Series.
Here is a good article on thermostats:-
https://www.coolcatcorp.com/thermostats ... stats.html


Edward1949
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Re: Thermostat rating.

Postby Edward1949 » Mon Dec 13, 2021 3:30 pm

Never really understood why there are "winter" and "summer" thermostats. Even a typical winter 88C thermostat, is going to be wide open way before there's any danger of boiling over in a summer heatwave. I've always left the 88C in all year (and enjoy a hot heater).

Mick Lynch
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Re: Thermostat rating.

Postby Mick Lynch » Mon Dec 13, 2021 8:38 pm

Edward1949 wrote:
Mon Dec 13, 2021 3:30 pm
Never really understood why there are "winter" and "summer" thermostats.
Coldest ever at this house was Feb 2013 and -37 deg C at 5.30 am. This is just balmy December.
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