Yanmar 4LHA-HTP User Manual

Chapter 6 Cooling Water System
2. See Water Pump
.4LHA Serit
8 9 10 1 11 5 6
12 2 13
Above drawings show P/No.119171-42500
1. Sea water pump body 6. Mechanical seal 11. Water seal ring
2. Side cover 7. Circlip 12. O-ring
3. Impeller (C-type) 8. Bearing 13. Hexagonal bolt
4. Wear plate 9. Bearing
5. Pump shaft 10. Oil seal
Direction of rotation V
For 4 LHA-HTE/HTZE/HTP/HTZP
: P/No. 119171-42500
For 4LHA-DTE/DTZE/DTP/DTZP
-STE/STZE/STP/STZP
: P/No. 119175-42500
2-2 Specifications of sea water pump (4LHA-HTE/HTZE/HTP/HTZP)
Gear ratio (crank gear/pump gear)
24/27
Pump speed
Suction head
Total head
Delivery capacity
3000 rpm
0Jm(1^66ft)
9.5m (31.16ft)
6000l/h(198315in.
3
/h)
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
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.
Standard
Clearance at assembly
Maximum allowable
clearance
Wear limit
Impeller width
31.6 ~ 31.8 (1.2440 ~ 1.2519)
0 ~ 0.3 (0 ~ 0.0118)
0.8 (0.0314)
31.3 (1.2322)
Wear plate thickness
2 (0.0787)
0 ~ 0.3 (0 ~ 0.0118)
0.8 (0.0314)
1.8 (0.0708)
Housing width
33.8 ~ 33.9 (1.3307 ~ 1.3346)
0 ~ 0.3 (0 ~ 0.0118)
0.8 (0.0314)
Side plate thickness
2 (0.0787)
0 ~ 0.3 (0 ~ 0.0118)
0.8 (0.0314)
1.8 (0.0708)
6-5

Yanmar 4LHA-HTP Specifications

General

Brand	Yanmar
Model	4LHA-HTP
Category	Engine
Language	English