Yanmar 4LHA-HTP Operation Manual page 522

Chapter 6 Cooling Water System
2. See Water Pump
8 9 10 1 11 5 6
Above drawings show P/No.119171-42500
1. Sea water pump body
2. Side cover
3. Impeller (C-type)
4. Wear plate
5. Pump shaft
2-2 Specifications of sea water pump (4LHA-HTE/HTZE/HTP/HTZP)
Gear ratio (crank gear/pump gear)
Pump speed
Suction head
Total head
Delivery capacity
2-3 Sea water pump disassembly
(1) Remove the rubber hose from the sea water pump
outlet and then the sea water pump assembly from the
gear case.
(2) Remove the sea water pump cover and take out the
O-ring, impeller and wear plate.
(3) Remove the mechanical seal side stop ring.
(4) Insert pliers from the drive gear long hole and remove
the stop ring that holds the bearings.
(5) Lightly tap the pump shaft from the impeller side and
Impeller width
Wear plate thickness
Housing width
Side plate thickness
6. Mechanical seal
7. Circlip
8. Bearing
9. Bearing
10. Oil seal
24/27
3000 rpm
0Jm(1^66ft)
9.5m (31.16ft)
6000l/h(198315in. /h)
3
Standard
31.6 ~ 31.8 (1.2440 ~ 1.2519)
2 (0.0787)
33.8 ~ 33.9 (1.3307 ~ 1.3346)
2 (0.0787)
12 2 13
11. Water seal ring
12. O-ring
13. Hexagonal bolt
remove the pump shaft, bearings, and drive gear as a
set.
(6) Remove the oil seal and mechanical seal if necessary.
2-4 Sea water pump inspection
(1) Inspect the rubber impeller, checking for splitting
around the outside, damage or cracks, and replace if
necessary.
Clearance at assembly
0 ~ 0.3 (0 ~ 0.0118) 0 ~ 0.3 (0 ~ 0.0118) 0 ~ 0.3 (0 ~ 0.0118) 0 ~ 0.3 (0 ~ 0.0118)
6-5
Direction of rotation V
For 4 LHA-HTE/HTZE/HTP/HTZP
: P/No. 119171-42500
For 4LHA-DTE/DTZE/DTP/DTZP
- S T E / S T Z E / S T P / S T Z P
: P/No. 119175-42500
Maximum allowable
Wear limit
clearance
31.3 (1.2322)
1.8 (0.0708)
0.8 (0.0314) 0.8 (0.0314) 0.8 (0.0314) 0.8 (0.0314)
1.8 (0.0708)
.4LHA Serit