Advertisement
(b) Remove the water pump by carefully sliding it off the pump shaft.
(c) Remove the pump cover (A) and joint (B) and remove the impeller (C).
(d) Inspect the water sealing washer (D), water thrower (E). seal in the
pump body (F) and the impeller for damage, and replace if necessary.
(e) It is not necessary to remove the cam plate from the inside of the pump
body.
28. To replace water pump (Fig. 5)
(a) Replace the water pump adaptor (G) and shim (H). if removed.
Replace the water sealing washer and water thrower, leaving a gap
between them
(b) Carefully slide the water pump body onto the shaft with the cam plate
screw uppermost and tighten up. Ensure that the water thrower is just
clear of the pump body.
(c) Ensure that the pump shaft does not touch the pump cover when the
water pump is replaced. If it does, extra shims must be added between
the adaptor plate and the pump body
(d) Replace the impeller on the shaft and refit joint and cover plate. The
joint must be positioned so that the camplate is covered.
(e) Replace the inlet and outlet pipes.
29. Decarbonising
A carbon deposit forms on piston and cylinder head and the presence of
an excessive carbon deposit is usually indicated by a dirty exhaust and a
falling off of power.
Decarbonising necessitates the removal of the cylinder head. followed
by the removal of all carbon and the grinding in of the valves These
operations are described in subsequent paragraphs.
Sets of joints are obtainable from Petters Ltd or their agents.
30. To remove cylinder head
(a) Drain the cylinder and cylinder head
(b) Remove the cooling water inlet and outlet pipes.
Fig. 5
25
Advertisement
