Bukh DV36/48 Workshop Manual - page 120
009W2329-R01
O4
Johnson cooling water pump type F5B9
The cooling water pump is used for direct s eawater cooling with a cam height 0f 2.0 mm and
for freshwater cooling with heat exchanger to the seawater side with a cam height of 3.1 mm
(see technical data page A5).
Removal of the pump
1. Loosen the three screws in the flange marked A.
2. Remove the cooling water pipes going to and from the pump.
3. Lift the pump free in one piece from its attachment in the engine block.
Dismantling of the pump
1. Loosen the three screws marked B in the front cover of the pump and remove the
front cover.
2. Withdraw the neoprene impeller which is fitted on a multiple spline shaft.
3. The cam determining the characteristic of the pump can be exchanged now by
loosening the screw marked C.
4. Take out the washer and locking ring behind the impeller. Then loosen the bolt D in
the mounting flange.
5. Press the pump free of the cast intermediate housing (610G0250) with two
screwdrivers in the gap E. Take out the carbon ring stuffing box in the pump.
Dismantling of the intermediate housing
1. Proceed as when dismantling the pump.
2. Pull out the gear-wheel F with a special tool. The gear-wheel is shrinked onto the shaft
and secured by a drilled-in tube pin. When fitting a new gear-wheel the diference of
temperature should be in accordance with the drawing overleaf. Bore in thethe tube
pin after fitting of the gear-wheel.
3. Remove the locking ring marked G.
4. Knock out the shaft with ball bearings facing the gear-wheel side with a punch or a
wooden block as intermediate piece. Now the ball bearings and the seal ring in the
bottom of the intermediate housing can be exchanged.