Northern Lights M65C13, Operator'S Manual

Page: 54 / 122

Lubrication&Maintenance/2000 Hour/24 Month
RG19661,00003D0 -19-29JAN13-1/4
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Checking and Adjusting Engine Valve
Clearance
CAUTION: To prevent accidental starting of engine
while performing valve adjustments, always
disconnect NEGATIVE (—) battery terminal.
IMPORTANT: Valve clearance MUST BE checked
and adjusted with engine COLD.
1. Remove rocker arm cover and crankcase ventilator
tube.
IMPORTANT: Visually inspect contact surfaces of
valve tips, bridges and rocker arm wear pads.
Check all parts for excessive wear, breakage, or
cracks. Replace parts that show visible damage.
Rocker arms that exhibit excessive valve
clearance should be inspected more thoroughly
to identify damaged parts.
2. Remove plastic plugs or cover plate from engine
timing/rotation hole (A) and timing pin hole (B).
NOTE: Some engines are equipped with flywheel housings
which do not allow use of an engine flywheel rotation
tool. These engines with straight nose crankshafts
may be rotated from front nose of engine, using
JDG966 Crankshaft Front/Rear Rotation Adapter.
3. Using JDE83 or JDG820 Flywheel Turning Tool,
rotate engine flywheel in running direction (clockwise
RG13749
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1NOV04
Flywheel Housing Timing Holes
A—Timing/Rotation Hole B—Timing Pin Hole
viewed from front) until No. 1 (front) cylinder is at
TDC compression stroke. Insert JDG1571 or JDE81-4
Timing Pin in flywheel.
If No. 1 cylinder rocker arms are loose, the engine is
at No. 1 TDC compression.
If No. 1 cylinder rocker arms are not loose, rotate
engine one full revolution (360°) to No. 1 TDC
compression.
4. Adjust valves to specifications below using the valve
clearance adjustment procedure in the following
blocks. Loosen the jam nut (A) on rocker arm
adjusting screw. Turn adjusting screw until feeler
gauge (B) slips with a slight drag. Hold the adjusting
screw from turning with screwdriver and tighten jam
nut to specifications. Recheck clearance again after
tightening jam nut. Readjust clearance as necessary.
Specification
Intake Valve Clearance
Adjustment (Rocker
Arm-to-Bridge) (Engine
Cold)—Clearance...................................................... 0.36 mm (0.014 in.)
Exhaust Valve Clearance
Adjustment (Rocker
Arm-to-Bridge) (Engine
Cold)—Clearance...................................................... 0.46 mm (0.018 in.)
Rocker Arm Adjusting
Screw Jam Nut—Torque................................................. 27 N·m (20 lb-ft)
5. Install rocker arm cover and crankcase ventilator tube.
6. Reconnect battery terminal.
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Adjusting Valves
A—Adjusting Screw Jam Nut B—Feeler Gauge
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