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John Deere POWERTECH 4045 User Manual

Page 169

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Lubrication & Maint./2000 Hour/24 Month

DPSG,RG41165,137

–19–27JUL06–1/5

Check and Adjust Valve Clearance (All
Engines Except 4045HF475 And 6068HF475)

RG7408

–UN–06AUG96

Flywheel Housing Timing Holes

A—Timing/Rotation Hole
B—Timing Pin Hole

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 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 may be
rotated from front nose of engine, using JDG966
Crankshaft Front/Rear Rotation Adapter.

3. Using JDE83 or JDG281AFlywheel Turning Tool, rotate

engine flywheel in running direction (clockwise viewed
from front) until No. 1 cylinder is at TDC compression
stroke. Insert JDG1571 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.

35-9

080706

PN=167

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