RDG603A20 - Issue 10
Page 44 of 100
6. Twin Thermostats
– Shire 45 and 50
WARNING:
SCALD HAZARD!
NEVER REMOVE THE TWIN THERMOSTAT CAP IF THE ENGINE
IS HOT. STEAM AND HOT WATER MAY SPURT OUT AND SERIOUSLY BURN YOU.
TIGHTEN THE TWIN THERMOSTAT CAP SECURELY AFTER BEING REMOVED.
STEAM CAN SPURT OUT DURING ENGINE OPERATION IF THE CAP IS LOOSE.
WARNING:
BURN HAZARD!
THE TWIN THERMOSTAT HOUSING IS HOT AND MAY BURN YOU.
The twin thermostat design is a feature unique to some of the Shire canal boat engine range.
It ensures that the engine warms up very quickly due to the first thermostat being closed so
that cooling water is routed through the specially designed cast iron exhaust manifold (Shire
50 only). The waste heat from the exhaust is recycled to bring the engine up to operating
temperature even quicker than normal. This ensures efficient engine operation with reduced
fuel consumption and even cleaner exhaust emissions. It also helps in keeping engine wear
to a minimum.
Figure 22
shows the operation of the cooling system. Note: Shire 38 and 40 have a single
thermostat only.
