We remove the coolant pump housing when repairing the engine (see Disassembling and assembling the engine)
Usually, as a result of operation before engine overhaul, a malfunction of the coolant pump may result from wear of the bearing and oil seal.
Therefore, only the pump cover can be replaced.
Drain the coolant (see Replacing the coolant).
It is more difficult to dismantle the pump on a carburetor engine, so all operations are shown on it.
Remove the fan casing (see Removing the fan casing of a carburetor engine).
Remove the coolant pump drive belt (see Adjusting the tension and replacing the coolant pump drive belt).
Using a 13mm socket, unscrew the three bolts securing the impeller and coolant pump pulley.
Remove the washer
Remove the fan impeller
Remove the pulley.
Disconnect the generator mount to the tension bar.
Using a 17mm socket, unscrew the nut securing the tension bar to the coolant pump cover.
Remove the tension bar.
Using a 13mm socket, unscrew the four nuts securing the bracket and coolant pump cover
Remove the bracket and coolant pump cover.
The joint between the cover and the coolant pump housing is sealed with a gasket.
We install the coolant pump cover in the reverse order.
To facilitate installation of the pulley, impeller and washer, we screw an M8 pin about 40 mm long into the pulley hub.
We put all the parts on the stud and the protrusion of the pulley hub, attach two bolts and replace the stud with a bolt