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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. The element part number is:
M844
and M844
W3
3. C-Series sets: the element cannot be cleaned.
Replace it when necessary. Part number is:
M20
– #24-28401
CRW3
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) .
Cylinder
No. 1
Valve
In
Ex
In
Arrangement
When No. 1
cyl. is at TDC
in compression
stroke
With the
crankshaft
0
turned by 360
in normal
direction from
above
Figure 7: 844W3 and 844LW3 Valve sequence
Servicing
– #24-23100
LW3
No. 2
No. 3
No. 4
Ex
In
Ex
In
Ex
OM844W3 5/11
Figure 8: Valve Adjustment
SP6. VALVE CLEARANCES
1. Adjust valve clearance after 1000 hours or as
needed.
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
rocking). Then turn the crankshaft one more full
turn and adjust the clearance on both valves for this
cylinder.
Align the top mark of the crank pulley with the top
mark of the timing gear case.
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
(
). Clearance on both intake and exhaust
Figure 8
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).
17
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