4 cylinders + 6 cylinders 4 cylinders + 6 cylinders - Steyr Motors

ToC SERVICE MANUAL MARINE ENGINES
05 COOLING SYSTEM
NOTE:
When testing the device in a test tank, let the engine run in idle gear. For some test tanks
the water volume possibly may not be sufficient to let the engine run in a gear without
creating considerable turbulences. These could take effect onto water suction and be
interpreted by mistake as a cooling problem.
2.4 Check rate of flow of raw water.
Special tool No. VR00136/0 (ill.1)
ill.1/pos.2pressure gauge (0-4bar)
ill.1/pos.3intermediate sealing ring
ill.1/pos.4pressure gauge connection
ill.1/pos.5pressure hose
ill.1/pos.10 pipe stub, measurement of pressure
raw water
9
8
7
6
10
1 2
3
4
5
Measurement of pump feed pressure at the outlet of
raw water pump (ill.2)
1 Disconnect hose from pressure side of raw water
pump, connect pipe stub (ill.2/pos.10) and connect
raw water hose to pipe stub again.
00.03 ill.1
2
2 Mount intermediate sealing ring (ill.2/pos.3) with
pressure gauge connection (ill.2/pos.4) onto pressure
gauge (ill.2/pos.2) and connect it at one end of
pressure hose (ill.2/pos.5).
3 Connect the other end of pressure hose (ill.2/pos.5)
to pipe stub (ill.2/pos.10).
10
3
4
5
4 Start the engine and check for leakages.
00.03 ill.2
5 Put boat into operation and approach speed points according to diagram. Compare measured pressure
with table below.
Conclusion:
- If the pump pressure is lower than the min. quantity in the table, the problem is
at suction side of raw water system.
- If the pump pressure is higher than the max. quantity in the diagram, the problem
is at pressure side of raw water system.
Raw water pump delivered pressure (standard impeller)
RPM
600
1300
1800
2300
2800
3300
3800
4300
Bar
0,20
0,60
1,00
1,50
1.85
1,80
1,60
1,45
Z001019/0_6_July 2008 Page COOLING SYSTEM - 7