Adjustment Of Engine Controls - Piper Lance II Service Manual

LANCE II SERVICE MANUAL
A953
0.010
TO.030
STOP
Figure 8-5. Adjustment of Engine Controls.
8-16. ADJUSTMENT OF THROTTLE AND MIXTURE CONTROLS. (Refer to Figure
8-5.) Throttle and mixture controls are adjusted so that when the throttle arm on the
carburetor is rotated forward against its full throttle stop and the mixture control is rotated
forward against its full rich stop, the cockpit control levers of the throttle and mixture
should have 0.010 to 0.030 of an inch spring back on instrument panel stop when in full
rich position.
a. The throttle may be adjusted as follows:
1. At the carburetor, disconnect the clevis end of the throttle control cable from
the control arm. Loosen the jam nut that secures the clevis end.
2. Adjust the linkage by rotating the clevis end on the cable to obtain 0.010 to
0.030 of an inch spring back on instrument panel stop when in full throttle position.
3. On aircraft equipped with air conditioning systems, a micro switch is located
below the throttle control which is set to actuate in the full open position. With the throttle
control adjusted to obtain a clearance of .010 to .030, adjust the micro switch to actuate at
this point also.
4. Reconnect the clevis end to the control arm and safety.
b. The mixture may be adjusted as follows:
1. At the carburetor, disconnect the clevis end of the mixture control cable from
the control arm. Loosen the jam nut that secures the clevis end.
2. Adjust the linkage by rotating the clevis end on the cable to obtain 0.010 to
0.030 of an inch spring back on the instrument panel stop when in full rich position.
3. Reconnect the clevis end to the control arm and safety.
c. Check security of cable casing attachments.
d. Pull the throttle and mixture levers in the cockpit full aft to ascertain that the idle
screw contacts its stop and the mixture control arm contacts its lean position. A mixture
control lock is incorporated in the quadrant cover which prevents the mixture control from
being moved to the idle cutoff position inadvertently. The lock must be depressed before
the control can be moved completely aft. Ascertain that the lock operates freely without
any tendency to bind or hang up.
Issued: 1/3/78
POWER PLANT
2A20