DUROMAX DUALFUEL XP12000EH Service Manual page 29

4.
Set valves to top dead center
Place screwdriver into spark plug hole to help determine the
position of the piston, then slowly pull the recoil rope until
the piston rises to the top position and both valves are closed
(compression step).
5.
Check intake valve clearance
The intake valve is on the right side of the cylinder head. Slide
a 0.006" (0.152 mm) feeler gauge in-between the valve head
and rocker arm. If the feeler gauge is too loose, then tighten
the rocker nut until the feeler fits firmly in the gap; but not too
tight that you can't remove it. If the feeler doesn't fit in the gap,
then loosen the rocker nut until feeler gauge fits firmly inside
the gap.
6.
Check exhaust valve clearance
The exhaust valve is on the left side of the cylinder head. Slide
a 0.008" (0.203 mm) feeler gauge in-between the valve head
and rocker arm. If the feeler gauge is too loose, then tighten
the rocker nut until the feeler fits firmly in the gap; but not too
tight that you can't remove it. If the feeler doesn't fit in the gap,
then loosen the rocker nut until feeler gauge fits firmly inside
the gap.
7.
Reinstall parts
Reinstall the valve cover, spark plug, and ignition coil wire. The
valve cover should be tightened to 20.7 ft/lbs ± 1.5 ft/lbs (28 ±
2 N·m). The spark plug should be tightened to 18.5 ft/lbs ± 3.5
ft/lbs (25 ± 5 N·m).
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