2. Inspection and adjustment
37
2.2.6 Inspection every 1,000 hours or four years
Be sure to check the following points every 1,000 hours or four years operation, whichever comes first.
(1) Check the injection timing
The fuel injection timing is adjusted so that engine
performance may become the best condition. As for the
inspection and adjustment of the fuel pump, it is based
on the service manual of the ML pump. The fuel
injection timing is adjusted by the following procedure.
1) Complete air bleeding from the fuel line and set the
engine ready for starting.
2) See that the timing marks on fuel pump mounting
flange and gear case are aligned.
3) Set the speed control lever at the operating
position.
4) Disconnect the injection pipe on the fuel pump side for the No.1 cylinder. (Do not remove the
delivery holder.)
5) Check the fuel discharge from the delivery holder while turning the crankshaft clockwise as seen
from the radiator, and stop turning it at the same time when the fuel comes out. Wipe out the fuel of
the delivery holder exit. Next, turn the crankshaft in the opposite direction (counterclockwise), and
return it to about 20 degrees before top dead center.
6) Check again the fuel discharge from the delivery holder while turning the crankshaft clockwise, and
stop turning it at the same time when the fuel comes out.
7) Read the timing scale on the flywheel from the hole on the flywheel housing. It is standard fuel
injection timing if the timing mark position meets the fuel injection timing of the below table.
8) Repeat the step 5) to 7) a few times.
(Note)
Injection timing check for one cylinder is generally sufficient. If it is to be checked for all cylinders,
check each cylinder in the ignition order of 1-3-2-1,
The cylinder to be checked is not limited to the No.1 cylinder and any cylinder may be checked.
9) If the injection timing is out of the standard value, loosen the fuel pump mounting nut and incline the
fuel injection pump toward or away from the engine for adjustment. Incline toward the engine to
delay the timing, and away from the engine to advance it.
No.
Inspection Item
(1)
Check the injection timing
(2)
Check the injection spray condition of a fuel nozzle
(3)
Check the impeller of the cooling water pump (seawater pump)
(4)
Clean & check the water passages
(5)
Diaphragm assembly inspection
(6)
Adjust the tension of the alternator driving belt
(7)
Retighten all major nuts and bolts
(8)
Adjust intake/exhaust valve clearance
(9)
Check/adjust the remote control operation
(10) Adjust the propeller shaft alignment
Model
Injection timing FID (FIC-Air)
degree bTDC
3YM30
16
±
1 (18
±
1)
3YM20
22
±
1 (24
±
1)
Hole
Flywheel
housing
Injection
timing marks
Flywheel
T.D.C.
No.1 cylinder
1
