There is a bellows on the bottom of the thermostat that expands and
cotracts to open the thermostat.
David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767
www.britishcarspecialists.com
On Oct 19, 2005, at 5:46 AM, tom felts wrote:
> OK---stupid question-------howdo you know if yours is a "bellows" type?
>
>
>
>
>> [Original Message]
>> From: David Nock <healeydoc@sbcglobal.net>
>> To: Bob Spidell <bspidell@comcast.net>; Healey List List
> <healeys@autox.team.net>; Dave & M <rusd@velocitus.net>; Blue
> OneHundred
> <healey.nut@gmail.com>
>> Date: 10/18/05 2:08:07 PM
>> Subject: Re: Thermostat Question
>>
>> The sleeved thermostats that we were supplying were not available for
>> a
>> while. We now have them in stock again.
>>
>> There is a big problem that we have found with the bellows style
>> thermostat. If you have upgraded the cooling system and are using a
>> higher pressure radiator cap than original. The problem is that the
>> higher pressure will cause the thermostat to close. Then the engine
>> temperature goes up and you have a overheating problem. So be careful
>> it you are using a bellows type thermostat with a radiator cap that
>> has
>> more than 7 lbs pressure you will have a overheating problem. The
>> other
>> problem with the bellows style thermostat is that when it fails and
>> all
>> thermostats will eventually, the bellows style will fail CLOSED. The
>> wax capsul style thermostats are designed to fail in the open
>> position.
>>
>> They both will do the same job when installed, they will close off the
>> bypass allowing all the coolant to flow thru the radiator. The bypass
>> is the to allow the coolant to flow around the block when the
>> thermostat is closed. All engines have one somewhere. The 4 cylinder
>> Healey motors the bypass is built into the block thru the water pump.
>>
>>
>> David Nock
>> British Car Specialists
>> Stockton Ca 95205
>> 209-948-8767
>>
>> www.britishcarspecialists.com
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