O844K 10/09
SP4. AIR CLEANER
1. Inspect air cleaner every 250 hours. In dusty condi-
tions, check more often.
2. Marine sets: if dirty, wash element in soapy water.
Rinse and dry thoroughly before re-installing.
Replace if necessary. Part numbers are:
M844
k
and M844L
k
– #24-23100
3. C-Series sets: the element cannot be cleaned.
Replace it when necessary. Part number is:
M20CL – #24-28401
4.
NoTe:
Make absolutely sure no impurities enter
the engine while changing the element. Do NoT
run the engine with the air cleaner removed.
SP5. v-bELTS
1. Check the tension and wear on the V-belt daily.
2. Use your thumb to press on the belt at the midpoint
between the crankshaft and alternator pulleys. The
tension is correct if the belt can be depressed about
3/16 in. (5 mm).
Servicing
Figure 8:
Valve Adjustment
SP6. vALvE CLEARANCES
1. Adjust valve clearance after first 50 hours of opera
-
tion and every 1000 hours thereafter.
2. Valve adjustments should be done after the cylinder
head bolts have been re-tightened. Engine should be
cold and NOT running.
3. Watch the valves while turning the engine over by
hand. Turn until the inlet valve starts to open and the
exhaust valve starts to close (the valves are rock-
ing). Then turn the crankshaft one more full turn and
adjust the clearance on both valves for this cylinder.
4. Loosen the lock nut and adjust the clearance between
the rocker arm and valve guide of both the intake
and exhaust valves with the adjustment screw (
Figure
8
). Clearance on both intake and exhaust valves
should be 0.008 in. (0.2 mm).
5. Repeat steps 3 and 4 for each cylinder. Each set of
valves must be adjusted individually.
6. Replace the rocker arm cover. Tighten cover nuts to
5 - 8 ft/lbs (0.8 - 2.3 kg/m).
13
Figure 7:
844
k
and 844L
k
Valve sequence
Ex In Ex In Ex In Ex In
No. 4 No. 3 No. 2 No. 1
Flywheel
