Doosan G06030001, Operation & Maintenance Manual

Page: 55 / 90

55 G60, G80, G100, G150, G200-SIIIA OM Manual
MAINTENANCE / 2000 HOURS / 2 YEARS
CHECK AND ADJUST ENGINE VALVE CLEARANCE
Adjust engine valve clearance as follows or have your
authorized servicing dealer or engine distributor adjust
the engine valve clearance.
Figure 55: Lock Engine at Top Dead Center
1. Remove rocker arm cover and crankcase vent tube.
2. Using JDE83 or JDG820 Flywheel Turning Tool (A),
rotate engine flywheel in running direction (clockwise
viewed from water pump) until No. 1 piston (front) has
reached top dead center (TDC) on compression
stroke. Insert timing pin JDG1571 (B) into flywheel
bore.
Figure 56: Adjust Valve Clearance
3. Check and adjust valve clearance to specification
according to the following procedure:
4. If valves need adjusting, loosen the locknut on rocker
arm adjusting screw. Turn adjusting screw until feeler
gauge slips with a slight drag. Hold the adjusting
screw from turning with screwdriver and tighten
locknut (A) to 27N·m(20lb.-ft.). Recheck clearance
after tightening locknut. Readjust clearance as
necessary.
5. Reinstall rocker arm cover and crankcase vent tube.
4045 Engine:
NOTE: Firing order is 1-3-4-2.
Figure 57: Valve Clearance Adjustment on 4045
Engines
1. Lock No. 1 piston at TDC compression stroke (B).
2. Adjust valve clearance on No. 1 and 3 exhaust valves
and No. 1 and 2 intake valves.
3. Rotate flywheel 360°. Lock No. 4 piston at TDC
compression stroke (C).
4. Adjust valve clearance on No. 2 and 4 exhaust valves
and No. 3 and 4 intake valves.
A Flywheel Turning Tool
B Timing Pin
A Locknut
SPECIFICATIONS
Specification Valve Clearance (Engine Cold)
Intake 0.35 mm (0.014 in.)
Exhaust. 0.45 mm (0.018 in.)
A Front of Engine
B No. 1 Piston at TDC Compression Stroke
C No. 6 Piston at TDC Compression Stroke
E Exhaust Valve
I Intake Valve Compression Stroke