Northern Lights and NL1066H3 Operator's Manual - page 22
ONL2-2 7/13
20
SP6. VALVE CLEARANCES
The following special tools will be needed:
JDE 281A or JDE 83 Flywheel Turning Tool.
JDG1571
Timing
Pin.
Make sure the negative battery terminal is discon-
nected before starting valve adjustments. Engine
must be cold to check and adjust valve clearances.
1. Remove rocker arm cover with ventilator tube.
2. Remove plastic plugs in engine timing holes on front
side of fl ywheel.
3. Rotate
fl ywheel in clockwise direction (viewed from
water pump) with the Flywheel Turning Tool until
the Timing Pin engages timing hole in the fl ywheel.
Both rocker arms for No. 1 cylinder will be loose at
Top Dead Center. If they are not, remove the timing
pin and rotate the fl ywheel one complete turn and
reinstall the timing pin in the fl ywheel.
4. Check contact surfaces of valve tips and rocker arm
pads for cracks or excessive wear, replace damaged
parts.
5. Valve Clearances for checking:
Intake Valve: 0.012-0.015 in. (0.31-0.38 mm)
Exhaust Valve: 0.016-0.019 in. (0.41-0.48 mm)
Valve Clearances for adjusting:
Intake Valve: 0.014 (0.36 mm)
Exhaust Valve: 0.018 in. (0.46 mm)
5. If the valves need adjusting, loosen the jam nut
(A on
Figure 12)
on the rocker arm adjusting screw. Turn
the adjusting screw until you feel a slight drag when
the feeler gauge slips. With a screwdriver, hold the
adjusting screw from turning while tightening the
jam nut to specifi cations. Check the clearance again
after tightening the jam nut. Re-adjust as needed.
Servicing
Reproduced by permission of Deere & Company, c2005. Deere & Company.
All rights reserved. RG7409
Figure 12
4-CYLINDER ENGINES:
Lock No. 1 piston at TDC compression stroke
(B).
Adjust valve clearance on No. 1 and No. 3
exhaust valves and No. 1 and No. 2 intake
valves.
Rotate fl ywheel 360°. Lock No. 4 piston at
TDC compression stroke (C).
NOTE: Firing order is 1 - 3 - 4 - 2
Reproduced by permission of Deere & Company, c2005. Deere & Company.
All rights reserved.
RG4776
Figure 13
A - Front of Engine
B - No. 1 Piston at TDC Compression Stroke
C - No. 4 Piston at TDC Compression Stroke
E - Exhaust
Valve
I - Intake
Valve
Adjust valve clearance on No. 2 and No. 4
exhaust valves and No. 3 and No. 4 intake
valves. Replace rocker arm cover and
crankcase ventilator tube.
Rocker Arm Adjusting Screw Jam Nut
Torque: .............27 N•m (20 lb-ft)
revised 2-23-12