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Onan P218 Carburetor
Onan P218 Carburetor Adjustment
Onan P218 carburetors have a fixed main jet. An optional fixed main jet
is available for altitude compensation above 5000 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 Operator’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 P218 Carburetor Overhaul
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.
Removal
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.
Disassembly
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.
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.
Onan P218 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.
Onan P218G Carburetor Adjustment
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 P218G 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.
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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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