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Onan P220 Carburetor
Onan P220G Carburetor Adjustment
Carburetor High-Altitude Jet
- If the engine is operated at an altitude above 5,000 feet (1,524
metres), it is recommended that the carburetor main fuel jet be replaced
with the optional high-altitude jet (which has a slightly smaller
orifice).
- To avoid slipping and gouging the main fuel jet, use a screwdriver
with a 5/16 inch (8 mm) wide blade.
Onan P220G Carburetor Replacement
- Other than replacing the carburetor main fuel jet (fixed-type) with
the optional high-altitude jet, fuel mixture adjustments should not be
attempted.
- Not should the carburetor be overhauled. Instead, a malfunctioning
carburetor should be replaced.
- Before replacing a carburetor, however, make certain: That all other
necessary engine and generator adjustments and repairs have been
performed; That the carburetor is actually malfunctioning.
- To remove the carburetor, remove the air cleaner, disconnect the fuel
line and choke and throttle linkages and unbolt the carburetor from the
intake manifold.
- When mounting the carburetor always use a new gasket.
- Readjust the choke and throttle cables and engine speed as instructed
in the engine or equipment Operator’s Manual.
Onan P220 Carburetor Adjustment
All carburetors have a fixed main jet. An optional fixed main jet is
available for altitude compensation above 5,000 feet. The carburetor
idle mixture was set for maximum efficiency at the factory and should
normally not be disturbed. If adjustments seem necessary, first be sure
the ignition system is working properly and governor sensitivity is
properly adjusted.
The carburetor has a limited adjustment range between stops of ±1/8
turn. The screw should only be adjusted within these limits; in to lean
the mixture, out to richen. Overtightening the mixture adjustment screw
will cause carburetor damage. Turn mixture adjustment screw in only
until light tension can be felt. If replacing idle mixture screw, turn
in until lightly seated, then turn screw back out 1-1/4 turns. Replace
limiter cap with the plastic stop approximately centered.
Carburetor Speed Settings
- Start the engine and allow it to warm up thoroughly (at least 10
minutes).
- Some equipment manufacturers may require higher throttle stop speed
and governor low speed rpm settings.
- Refer to equipment manufacturer’s Oper-ator’s Manual for the correct
rpm settings.
- When rpm settings are not specified by the equipment manufacturer, use
the rpm settings listed in Steps 2 and 3.
- Move the engine speed control to the slow position.
- Bend or turn the low speed stop on the governor so the throttle stop
screw on the carburetor controls engine speed. - Adjust the throttle
stop screw for 1000 rpm idle.
- Adjust the governor low speed stop for 1100 rpm idle.
- Move the engine speed control to the fast position.
- Bend the high speed stop on the governor so the engine runs at the
equipment manufacturer’s recommended speed.
Onan P220 Carburetor - Removing and
Disassembly
Carburetion problems that are not corrected by mixture adjustments are
usually a result of gummed-up fuel passages or worn internal parts. The
most effective solution is a carburetor overhaul. In general,
overhauling a carburetor consists of disassembly, a thorough cleaning,
and replacement of worn parts. Carburetor overhaul kits are available.
- Remove air cleaner assembly.
- Disconnect governor and throttle linkage, choke control, and fuel line
from carburetor.
- Remove the four intake manifold cap screws and lift complete manifold
assembly from engine.
- Remove carburetor from intake manifold.
- Remove main jet and idle adjustment needle.
- Remove attaching screws and separate upper and lower carburetor
sections.
- Carefully note position of float assembly parts, then pull out
retaining pin and float assembly.
- Remove needle valve.
Onan P220 Carburetor - Cleaning and Repair
- Soak all metal components not replaced in carburetor cleaner.
- Do not soak non-metal floats or other non-metal parts. Follow the
cleaning manufacturer’s recommendations.
- Clean all carbon from the carburetor bore, especially where the
throttle and choke plates seat. Be careful not to plug the idle or main
fuel ports.
- Dry out all passages with low pressure air (35 psi). Avoid using wire
or other objects for cleaning which may increase the size of critical
passages.
- Check the condition of the adjustment needle; replace if damaged.
Replace float if loaded with fuel or damaged.
- Check the choke and throttle shafts for excessive play in their bore.
This condition may necessitate replacement of the carburetor.
- Replace old components with new parts.
OOnan P220 Carburetor - Reassembly and
Installation
- Install needle valve, main jet, and float assembly.
- Make sure float pivot pin is properly placed and float moves freely
without binding.
- Turn carburetor on its side and measure float level. Adjust float
level only if necessary.
- Measure float drop (the distance from the top of carburetor body to
top of float). Adjust only if necessary.
- Position gasket on lower carburetor section and install upper
carburetor section.
- Install idle adjustment screw, throttle stop screw, and fixed main jet
plug.
- Mount carburetor on intake manifold and install assembly on engine.
- Connect governor and throttle linkage, choke control, and fuel line.
Mount air cleaner assembly.
- Adjust carburetor and governor according to directions given in this
section.
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KOHLER ENGINES SPECS AND SERVICE DATA |
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KAWASAKI ENGINES SPECS AND SERVICE DATA |
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BRIGGS AND STRATTON ENGINES SPECIFICATIONS |
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HONDA ENGINES SPECS AND SERVICE DATA |
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