Northern Lights OM150C12 Operator's Manual - page 16
14
OM150C12 11/11
SP6. VALVE CLEARANCES
CAUTION: Disconnect the negative (-) battery
terminal before starting valve adjustments to
prevent accidentally starting the engine.
Valve clearance must be checked and adjusted
with the engine cold.
The following special tools will be needed:
JDE 820 or JDE 83 Flywheel Turning Tool.
JDE 81-4 Timing Pin.
1. Remove rocker arm cover with ventilator tube.
NOTE: Inspect the valve tips, bridges, rocker arm
wear pads and contact surfaces for cracks or
excessive wear. Replace parts that show damage.
2. Remove plastic plugs or cover plate in engine timing
holes on front side of flywheel
(Figure 6 A & B)
.
Reproduced by permission of Deere & Company, c2004. Deere & Company.
All rights reserved.
RG12168
Figure 6
3. Rotate flywheel in clockwise direction (viewed from
water pump) with the Flywheel Turning Tool until
the Timing Pin engages timing hole in the flywheel.
Both rocker arms for No. 1 cylinder will be loose at
Top Dead Center. If not, remove the timing pin and
rotate the flywheel one complete turn and reinstall
the timing pin in the flywheel.
4. Valve clearances:
Intake Valve: 0.014 in. (0.36 mm)
Exhaust Valve: 0.018 in. (0.46 mm)
5. If the valves need adjusting, loosen the jam nut (A on
Figure 7) 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 specifications. Check the clearance again
after tightening the jam nut. Re-adjust as needed.
Servicing
Valve Clearance Adjustment Specifications:
Intake Valve Adjustment Clearance
(Rocker arm to bridge).......................0.36 mm (0.014 in.)
Exhaust Valve Adjustment Clearance
(Rocker arm to bridge).......................0.46 mm (0.018 in.)
Rocker Arm Adjusting Screw
Jam Nut Torque.................................27 N•m (20 lb-ft)
Reproduced by permission of Deere & Company, c2004. Deere & Company.
All rights reserved.
RG12169
Figure 7
Lock No. 1 piston at TDC compression stroke
(Figure
8-B)
Adjust valve clearance on No. 1, No. 3, and No.
5 exhaust valves and No. 1, No. 2, and No. 4 intake
valves. Rotate flywheel 360°. Lock No. 6 piston at
TDC compression stroke
(Figure 8-C)
.
Note: Firing Order is 1-5-3-6-2-4
Reproduced by permission of Deere & Company, c2004. Deere & Company.
All rights reserved.
RG12170
Figure 8
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, No. 4, and No. 6
exhaust valves and No. 3, No. 5, and No. 6 intake
valves.
Install rocker arm cover and crankcase ventilator tube.
Reconnect battery terminal.