Yanmar 4LHA-HTP Operation Manual page 523

Chapter 6 Cooling Water System
2. See Water Pump
(3) Inspect the mechanical seal and replace if the spring is
damaged, or the seal is corroded. Also replace the
mechanical seal if there is considerable water leakage
during operation.
Cooling water leakage
Parts No.of
mechanical seal
2-5 Sea water pump reassembly
(1) When replacing the mechanical seal, coat the No.l 101
oil seal and pressure fit. Coat the sliding surface with a
good quality silicon oil, taking sufficient care not to
cause any scratches.
(2) When replacing the oil seal, coat with grease and in-
sert.
(3) Mount the pump shaft, ball bearing and gear assembly
to the pump unit and fit the bearing stop ring. Be sure
not to forget the water O-ring when doing this.
NOTE: Coat the shaft with grease.
(4) After inserting the mechanical seal stop ring, mount
the wear plate and impeller.
NOTE: 1. When inserting the impeller in the pump, make
sure that the impeller lies in the proper direction.
2. Coat the inside of pump body impeller housing
with grease.
(5) Mount the O-ring between the pump body and side cover.
NOTE: Replace the O-ring.
O-ring P/No. : 24321-000700
(For 4LHA-HTE/HTZ E/HTP/HTZP)
P/No.: 119175-42570
For 4LHA-DTE/DTZE/DTP/DTZP
-STE/STZE/STP/STZP ,
Impeller P/No.: 123325-42020
(For 4LHA-HTE/HTZE/HTP/HTZP)
P/No. : 127610-42200
For 4LHA-DTE/DTZE/DTP/DTZP
-STE/STZE/STP/STZP
less than3cc/h(0.18in. /h)
3
123472-42060 for
4LHA-HTE/HTZE/HTP/HTZP
129670-42560 for
4LHA-DTE/DTZE/DTP/DTZP
-STE/STZE-STP/STZP
Rotational direction
of rubber impeller
6-6
t4LHA Series