Piper COMANCHE PA-24-180 Service Manual page 325

PIPER COMANCHE SERVICE MANUAL
LEFT MAGNETO RIGHT MAGNETO
CCMBINATION STARTER AND IGNITION SWITCH
STARTER RELAY
STARTING MOTOR
FIGURE 7-16. IGNITION SYSTEM RETARD BREAKER MAGNETO INSTALLATION
7-46. Harness Assembly.
a. Check lead assemblies for nicks, cuts, mutilated braiding, badly worn section or any other evidence
of physical damage. Inspect spark plug sleeves for chafing or tears and damaged or stripped threads on
coupling nuts. Check compression spring to see if it is broken or distorted. Inspect grommet for tears. Check
all mounting
brackets and clamps to see that they are secure and not cracked.
b. Using an ohmmeter, buzzer, or other suitable low voltage device, check each lead for continuity. If
continuity does not exist, wire is broken and must be replaced.
c. Minor repair of the harness assembly, such as replacement of contact springs, spring retainer
assemblies, insulating sleeves or of one lead assembly, can be accomplished with the harness assembly
mounted on the engine. However. should repair require replacement of more than one lead assembly or of a
cable outlet plate, the harness should be removed from the engine and sent to an overhaul shop.
7-47. Removal Of Harness.
a. Disconnect the clamps that secure the wires to the engine and accessories.
b. Loosen the coupling nuts at the spark plugs and remove the insulators from the spark plug barrel
well. Use caution when withdrawing the insulator not to damage the insulator spring.
c. Place a guard over the harness insulators.
d. Remove the harness assembly terminal plate from the magneto.
e. Remove the engine baffle plate that receives the harness assembly.
f. Remove the harness from the airplane.
ISSUED: 8/18/72 POWER PLANT
2B15