John Deere CD4039DF008 - Manual (Page 57)

Maintenance/2000 hours/2 years
DPSG,CD03523,36 –19–13JUL99–1/4
CHECK AND ADJUST ENGINE VALVE
CLEARANCE (POWERTECH ENGINE)
CD30544
–UN–19MAY98
Adjust engine valve clearance as follows or have your
authorized servicing dealer or engine distributor adjust the
engine valve clearance.
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 JDE81-4 (B) into flywheel bore.
DPSG,CD03523,36 –19–13JUL99–2/4
RG7409
–UN–06AUG96
3. Check and adjust valve clearance to specifications
according to following procedures.
Valve clearance (engine cold)—Specification
Intake 0.35 mm (0.014 in.) ..........................................................................
Exhaust 0.45 mm (0.018 in.) .......................................................................
4. If valves need adjusting, loosen the lock nut 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 lock nut to
27 N•m (20 lb-ft). Recheck clearance again after
tightening lock nut. Readjust clearance as necessary
5. Reinstall rocker arm cover and crankcase vent tube.
Continued on next page
40-1
112699
PN=57