Yanmar 1GM User Manual page 128

122
@
Pressure reliefvalve
OIL PRESSURE REGULATOR
1. Plug
2. Shim
3. 011 pressure relief spring
4. 011 pressure relief ball
5. Pipe
6. Nut
7. O-ring
8. 011 filter
FLYWHEEL
CHAPTER SIX
8
An
oil pressure relief valve is located in the oil filter
mounting pipe (Figure 57). If oil pressure exceeds
300-400 kPa (43-57 psi), the reliefvalve opens and expels
oil into the timing gearcase.
Do not attempt to disassemble the oil pressure relief
valve. The valve is sealed and it must be replaced as a unit
assembly.
Oilpickup
The oil pickup is located in the oil pan. The pickup in-
cludes a strainer to prevent foreign matter from entering
the lubrication system.
To remove the oil pickup, remove the oil pan and un-
screw the jam nut (Figure 58).
Removal/lnstallation
1. Remove the engine from the boat.
2. Remove the transmission.
3. Remove the drive disc (Figure 59, typical).
4. Gradually loosen and remove the flywheel bolts,
working in a diagonal pattern. Install two drive disc
screws into two outer holes in the flywheel (Figure 60,
typical), then use the screws to pull and remove the fly-
wheel.
5. Inspect the ring gear. If the ring gear is excessively
worn or damaged, use the following procedure to remove
the ring gear:
a. Heat the ring gear evenly, then drive the ring gear
off the flywheel.