Generac GP 3250 Manuel Du Propriétaire page 13

3.3.6 REPLACING THE SPARK PLUG
Use spark plug F6TC, NGK BP6IS or Champioin RN11YC. Replace
the plug once each year. This will help the engine start easier and
run better.
1. Stop the engine and pull the spark plug wire off of the spark
plug.
2. Clean the area around the spark plug and remove it from the
cylinder head.
3. Set the spark plug's gap to 0.76 mm (0.030 in.). Install the
correctly gapped spark plug into the cylinder head and torque
to 15 ft/lbs. (Figure 13).
Figure 13 - Spark Plug Gap
3.3.7 SPARK ARRESTOR
The engine exhaust muffler has a spark arrestor screen. Inspect
and clean the screen at least once each year (Figure 14). If unit is
used regularly, inspect and clean more often.
If using the generator on any forest-covered, brush-covered
or grass-covered unimproved land, it must equipped with a
spark arrestor. The spark arrestor must be maintained in good
condition by the owner/operator.
Clean and inspect the spark arrestor as follows:
1. Remove clamp and spark arrestor from muffler.
2. Inspect screen and replace if torn, perforated or otherwise
damaged. DO NOT USE a defective screen. If screen is not
damaged, clean it with commercial solvent.
3. Replace the spark arrestor and clamp.
Figure 14 - Spark Arrestor
Muffler
NOTICE:
Clamp
Screen
3.4 SERVICE AIR FILTER
The engine will not run properly and may be damaged if using a
dirty air filter. Clean the air filter every 25 hours (Figure 15). Clean
or replace more often if operating under dusty conditions.
1. Remove air filter cover.
2. Wash in soapy water. Squeeze filter dry in clean cloth (DO
NOT TWIST).
3. Clean air filter cover before re-installing it.
Figure 15 - Air Filter
AIR FILTER
BOLT
AIR FILTER COVER
3.5 VALVE CLEARANCE
• Intake — 0.10 ± 0.02mm (cold), (0.004" ± 0.0008" inches)
• Exhaust — 0.15 ± 0.02mm (cold) (0.006" ± 0.0008" inches)
After the first 50 hours of operation, check the valve clearance in
the engine and adjust if necessary.
Important: If feeling uncomfortable about doing this procedure or
the proper tools are not available, please take the generator to the
nearest service center to have the valve clearance adjusted. This is a
very important step to ensure longest life for the engine.
To check valve clearance:
1. Make sure the engine is at room temperature (60° - 80° F).
2. Make sure that the spark plug wire(s) is removed from the
spark plug and out of the way. Remove spark plug(s).
3. Remove the four screws attaching the valve cover(s).
4. Make sure the piston is at Top Dead Center (TDC) of its
compression stroke (both valves closed). To get the piston
at TDC, remove the intake screen at the front of the engine to
gain access to the flywheel nut. Use a large socket and socket
wrench to rotate the nut and hence the engine in a clockwise
direction while watching the piston through the spark plug
hole. The piston should move up and down. The piston is at
TDC when it is up as high as it can go.
5. See Figure 17. Insert a 0.002 - 0.004 inch (0.05 - 0.1mm)
feeler gauge between the rocker arm and valve stem. Correct
clearance is when a slight drag is felt when sliding the gauge
back and forth. If the clearance is either excessively loose or
tight the rocker arms will need adjusting.
Maintenance
11