[Healeys] Bellows Thermostats

Alan Seigrist healey.nut at gmail.com
Mon Sep 4 00:19:32 MDT 2017

Hey Harold -

With the bellows type thermostat, your car will definitely heat up faster
and run cooler, but the bellows type isn't ideal because when it fails, it
fails in the closed position.

Here's a good article explaining which type you want.  Moss 434-155 is a
better unit, but only available in 160 deg (I think).  For six cylinder
cars 160 deg thermostat is good enough for most climates south of the mason
dixon line.




On Mon, Sep 4, 2017 at 12:16 AM, Harold Manifold <manifold at telus.net> wrote:

> Hello,
> I am in the process of putting my AH 3000 engine back together and went
> looking for a recommendation for the engine thermostat. I was expecting to
> find a recommendation for the opening temperature but instead found
> information that recommends a bellows type thermostat should be used and
> the bellows is important or some of the coolant can bypass the radiator
> when the thermostat opens. If a bellows type thermostat is recommended is
> the correct type either the Smiths 85025 series or the AC Delco TF series?
> Is there a modern replacement bellows type thermostat that fails in the
> open position?
> Your comments and insight is welcomed.
> Harold
> 1960 BT7
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