Air Filter; V-Belts; Valve Clearances - Northern Lights NL773LW4 Operator's Manual

SP4. AIR CLEANER
1. Inspect air cleaner every 200 hours. In dusty
conditions, check more often.
2. Industrial sets: the element cannot be cleaned.
Replace it when necessary. Part numbers are:
NL773LW3 – #24-27301
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 5: Valve Adjustment
SP6. VALVE CLEARANCES
1. Adjust valve clearance after 1000 hours of operation
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.
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 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).
Cylinder No.
Valve Arrangement
When No. 1 Cylinder
is at TDC in
Compression Stroke
With the Crankshaft
turned by 360 in
0
normal direction from
above
Valve Sequence
ONL773LW4 5/21
15
1 2
Intake Exh. Intake Exh. Intake Exh.
).
Figure 5
3