Carburetor Adjustments - Craftsman 580.327203 Manual Del Usuario

Carburetor Adjustments

Your engine carburetor is preset at the factory. The
carburetor should not be tampered with because this
will void the emission control system warranty. If you
experience problems or your engine is used at an
altitude in excess of 5,000 feet, contact the nearest
authorized dealer regarding high altitude setting
changes.
Check/Adjust Valve to Rocker Arm
Clearance
Every 50 hours of operation, remove the rocker
cover and check the valve to rocker arm clearance.
Important: If you feel uncomfortable about doing this
procedure or you don't have the proper tools, please
take your generator in to the nearest service center to
have the valve clearance adjusted. This is a very
important step to insure the longest life for your
engine.
When adjusting the clearance, the engine should be at
room temperature, and each piston should be at top
dead center (TDC) of its compression stroke (both
valves are closed). The correct clearance is
0.10-0.15 mm (0.004-0.006 in.). Check and adjust the
valve to rocker arm clearance as follows:
1. Remove the two nuts and seals from the valve
covers.
2. Remove the valve covers and gaskets.
3. With the spark plugs removed, rotate the crankshaft
until the piston in the cylinder you are checking is at
TDC of its compression stroke (both valves are
closed).
4. Place a caliper end through the spark plug hole and
continue turning the crankshaft until the piston has
moved 1/4 inch past TDC.
5. Check the valve clearance with a feeler gage
between the valve stem and rocker arm.
6. Adjust the valve so clearance is 0.1-0.15 mm
(0.004-0.006 in.) for both intake and exhaust
valves.
7. Tighten each lock nut while holding the adjusting
screw. Torque the lock nut to 7 N-m (60 in.-lbs).
8. Reinstall the valve cover gaskets, valve covers,
seals and nuts. Torque the nuts to 3 N-m
(25 in.-lbs).
Retorque the Head Bolts
After the first 50 hours of operation, retorque the head
bolts.
NOTE: Only perform this adjustment after the first
50 hours of operation. The head bolts will need no
further adjustment.
Important: If you feel uncomfortable about doing this
procedure or you don't have the proper tools, please
take your generator in to the nearest service center to
have the valve clearance adjusted. This is a very
important step to insure the longest life for your
engine.
1. Remove the valve covers as described previously.
2. Torque the head bolts in the sequence shown
below to 19 N-m (165 in.-lbs).
3. Reinstall the valve cover gaskets and valve covers
as described previously.
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