GENERAL
DISTRIBUTION
CARBURETOR MAINTENANCE
Check the following items during recommended engine inspection periods:
1. Check tightness and safety of all nuts and screws securing carburetor to engine.
2. Check all fuel lines for tightness and evidence of leakage.
3. Check throttle and mixture control rods and levers for travel, tightness, and safety.
4. Clean fuel inlet screen. (Refer to figure 73-1.)
5. Remove plug at aft position of carburetor and drain.
6. Check carburetor air box for wear and full travel of heat door.
7. Check adjustment of idle mixture and idle speed. (Refer to Adjustment of Idle Mixture and
Adjustment of Idle Speed.)
THROTTLE ARM
1. Remove screw securing throttle arm to carburetor. Do not remove throttle arm.
2. Remove and discard lock tab.
3. Examine screw to determine if there is a hole through head of screw. If not, drill a 1/16 inch diameter
hole through head of screw.
4. Reinstall screw and tighten to a torque of 20 to 28 inch-pounds.
5. Using 0.032 inch diameter safety wire, first tie wire to idle stop lever and then continue as shown in
figure 73-1.
6. Depending upon carburetor model, sequence and direction of tying may vary; however, idle stop arm,
throttle arm, and attaching screws must all be tied together.
ADJUSTMENT OF IDLE MIXTURE (figure 73-1)
—WARNING—
When performing engine warmup indoors, provide a barrier
around engine to prevent serious injury. Also provide adequate
means of ventilating work area.
1. After performing standard engine starting procedure, operate engine for a least two minutes between
800 to 1200 rpm to ensure proper engine warmup.
2. Pull back throttle control lever to obtain approximately 550 rpm on tachometer.
3. Turn idle mixture adjusting screw located near rear of carburetor, clockwise, to lean fuel mixture.
Continue to lean the mixture until engine begins to run rough.
73 - 11 - 00
Page - 73-01
Reissued: August 1, 1986
2I12
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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