THERE’S COOL AND THERE’S COOL...
QMy BMC 1.5 runs at around 60-70C, but a pal who also had a BMC told me 82C was the normal operating temperature. Might the thermostat be stuck open? I also intend to change the oil filter: can you recommend a supplier of parts? JN, via email
ATONY REPLIES: Is this a Calcutt Boats BMC? They have fitted lower temperature thermostats to boats with calorifiers to stop customers scalding themselves badly. Direct-cooled boats also use lower temperature thermostats.
You could change it as long as it is not direct-cooled. But be aware that someone may have tried to cover up an undersized skin tank problem or the like by fitting a cooler thermostat.
If the temperature rises to 60C over about ten minutes, then the thermostat is probably okay, but a lower temperature one. If it take ages to rise, then it is probably stuck open.
If the oil filter is a ‘spin on’ or bowl type, ASAP supplies, Calcutt Boats or your local motor factors will be able to help.