Doosan G430 LP Service Manual page 173

VE117-3L
3. Adjust the valve rocker arm nuts as follows:
(1) Turn the crankshaft until the mark on the
crankshaft pulley lines up with "0"on the timing
tab and number 1 cylinder is at top dead center.
(2) Place fingers on the number 1 valves as the
mark approaches "0" If the valves move as the
mark approaches "0", the engine is on number 4
top dead center and should be rotated one more
revolution in order to reach number 1 top dead
center.
(3) With the engine at number 1 top dead center,
adjust the following valves:
- The exhaust valves 1,3
- The intake valves 1,2,4
(4) Adjust the correct valves as follows:
• Back off the valve rocker arm nut until the lash
is felt in the valve pushrod.
• Tighten the valve rocker arm nut until all the
lash is removed.
• Zero lash can be felt by moving the valve
pushrod up and down between your thumb
and forefinger until there is no more
movement.
• When all the free play is gone, tighten the
valve rocker arm nut 1 additional turn (360
degrees).
LP Engine G430 (3.0L)
VE117-3L
(5) Turn the crankshaft 1 revolution until the mark
on the crankshaft pulley lines up with "0" on the
timing tab.
This is number 4 top dead center.
(6) With the engine at number 4 top dead center,
adjust the following valves:
- The exhaust valves 2,4
- The intake valves 3
• Back off the valve rocker arm nut until the lash
is felt in the valve pushrod.
• Tighten the valve rocker arm nut until all the
lash is removed.
• Zero lash can be felt by moving the valve
pushrod up and down between your thumb
and forefinger until there is no more
movement.
• When all the free play is gone, tighten the
valve rocker arm nut 1 additional turn (360
degrees).
- 172 - Base Engine Service Procedure