RDG603A20 - Issue 10 Page 44 of 1006. Twin Thermostats – Shire 45 and 50WARNING:SCALD HAZARD! NEVER REMOVE THE TWIN THERMOSTAT CAP IF THE ENGINEIS 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 sothat cooling water is routed through the specially designed cast iron exhaust manifold (Shire50 only). The waste heat from the exhaust is recycled to bring the engine up to operatingtemperature even quicker than normal. This ensures efficient engine operation with reducedfuel consumption and even cleaner exhaust emissions. It also helps in keeping engine wearto a minimum.Figure 22 shows the operation of the cooling system. Note: Shire 38 and 40 have a singlethermostat only.
