Ace AC thermostat

[pjbowman]

My Ace seems to actually be running too cool, so I'm guessing I need to replace the thermostat - either there is none in the housing, or it's stuck open. What cars used the equivalent thermostat and gasket? TR2 looks similar from the parts diagram, anyone know for sure?

[Klassik Metall]

The original bellows type thermostat fitted to the AC engine is pretty large both in height and diameter when compared to a modern unit. What you could do is have a look at your local parts  supplier for a modern unit with a suitable temperature range and then fit this unit in the original housing using a brass or aluminium spacer ring. This ring locates in the recess in the original housing and is simple to make if you have access to a lathe. The gasket can be easily cut out from thick Klingersil type gasket paper.
   
   Regards Luke.

[pjbowman]

Luke (or anyone) - do you have a picture of an original thermostat? And maybe measurements?

[Klassik Metall]

Yes,I've got an old thermostat somewhere & will post photos and measurements later today.

[Klassik Metall]

The thermostat measures 2  5/16" diameter is 3 3/8" tall and the lip where it sits in the housing recess is 5/32" thick.
   
   The original Smiths part No. is 30063/18 and the opening temperature is marked as 78 c 172f.
   
   

[1744]

Thames Ditton advised me March /97 "Should thermostat need to be replaced, fit aluminium washer to indentation in housing top face and size accordingly for a Ford bellows type replacement."
   
   This advice is basically what Luke advised except for the additional info re the Ford replacement.
   
   The markings on my original thermostat were "Smiths 3065/8 78C 172F."
   
   Jonathan

[pjbowman]

Thanks gents! I'll probably wait for winter weather before I pull the housing off to see what (if anything) is in there. Good to have this info.