Yamaha MM700A Manual page 176

This chapter covers service procedures for the water
pump, connecting hoses and heat exchangers.
Cooling system flushing procedures are in Chapter
Three.
The cooling system is a closed, liquid cooling system.
During operation, the coolant heats up and expands, thus
pressurizing the system. Coolant in the system transfers
heat from the engine to the heat exchangers. Coolant in
the engine also passes through the carburetor heater sys-
tem.
The liquid cooling system (Figure 1) consists of a pres-
sure cap, water pump, coolant reservoir, heat exchangers
and cylinder head.
Do not remove the pressure cap (Figure 2)
when the engine is hot. The coolant is very
hot and under pressure. Severe scalding
could result i f the coolant comes in contact
skin.
with
Chapter Eight
Cooling System
component of the system.
Coolant Pump
shaft that drives the oil injection pump. The impeller is lo-
cated under the cover (Figure 3) on the front of the crank-
case. The O-ring seal (Figure 4) located on the cover can
be replaced without disassembling the crankcase. Ifneed-
ing to replace the internal seals, refer to Chapter Four for
service procedures.
Removal
cedure. Note the location of any hose straps in order to re-
install them in their original positions.
2. Refer to Chapter Three and drain the coolant.
3. Detach the coolant hoses from the water pump.
The cooling system must cool before removing any
The coolant pump impeller is mounted on the same
Refer to Figure 5 when performing the following pro-