Freshwater Cooler - Yanmar 6LPA-STP2 Service Manual

Components Related to Cooling System
12/05
5. Attach the cap tester (Figure 7-17, (2)) to the
water filler. Increase the pressure to
2
1.2 kgf/cm (17 psi) by the pressure cap tester
and check that the pressure does not drop. If it
does, check the hose, freshwater tank, cooler
and freshwater pump for leakage. If no leakage
is discovered from the outside, check the
cylinder block and cylinder head.
6. Reinstall the pressure cap.

Freshwater Cooler

The freshwater cooler is the multi-pipe core type.
The seawater flows inside the core while the fresh
water flows outside the core to be cooled by the
seawater.
1. Disconnect the rubber hose connected to the
freshwater cooler (Figure 7-18, (1)).
2. Remove the freshwater cooler carefully, avoid
hitting or damaging during removal.
Check the rubber seat (Figure 7-18, (2)) holding
the freshwater cooler for collapse and cracks.
Replace it before failures occur. Check the hose
band (Figure 7-18, (3)) for damage to the screw,
nut and the plate. Replace as needed.
Figure 7-18
( 3 )
( 2 )
Figure 7-18
6LPA Service Manual
3. Remove the side cover from the freshwater
cooler. Check the core for contamination by
dust and foreign matter. If needed clean the
core (Figure 7-19, (1)) using a soft brush
(Figure 7-19, (2)) available locally.
Figure 7-19
( 1 )
0005346
© 2007 Yanmar Marine International
COOLING SYSTEM
( 2 )
( 1 )
0005347
Figure 7-19
7-13