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Just purchased a N33 1978, Ford 2712E Gustavson marinised, and found this thread very helpful despite being so old. Thank you to all contributors.
Hence, just in case someone will be searching the forum for thermostat issues, I would like to share my recent experience. The Ford maintenance manual specifies 82C for standard type thermostat (not high flow). A 74C could be used if motoring in waters warmer than UK waters (ASAP Supplies suggestion).
In the attached photos:
– Header tank
– Header tank removed and thermostat visible to centre left (rust covered circle)
– Thermostat removed and cleaned.
– Ford maintenance manual notes on thermostat.
On testing in a pan full of water, the thermostat started opening at around 80C, and fully open at 97C, just before boiling point. Spot on with Ford manual, apart from some measurement errors from my meat thermometer!