ENGINE-continued - TM-5-4320-273-140056

TM 5-4320-273-14

Table 4-2. Troubleshooting -- Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE -- Continued

Rotate engine by hand to locate the breaker arm on the high point of the cam. Using a feeler gage set the

point gap at a maximum of 0.015 inch (0.03 cm). Make the adjustment by inserting a screwdriver into the ad-

justing slot and pivot between the two small bosses on the bearing support.

Hold parts in position while tightening mounting screws.

Check point gap after tightening to assure correct adjustment has been maintained.

If cam is dry, apply light coat of grease.

Install distributor rotor (6).

Clean contact surfaces of end cap assembly (3) and housing (4) and instill new gasket (5). Secure cap to

housing with screws and assembled washers (1 and 2). Be sure ground strap is connected.

Install new capacitor (7) and preformed packing (8),

Check for shorted or grounded magneto by checking the oil pressure safety switch to ensure that the switch plunger is pulled

Step 3.

out.

Test magneto ignition spark by disconnecting a spark plug cable from a spark plug and hold the terminal 1/8 inch (0.32 cm)

away from any metal part of the engine. Use the hand crank to slowly turn the engine over two complete revolutions. Watch

for the spark discharge which should occur the instant the impulse coupling on the magneto snaps. Repeat this check with

each of the ignition wires.

If no spark occurs, replace magneto as follows:

Tag and disconnect spark plug cables, ground switch lead and ground strap.

Remove the nuts (9 and 10, fig. 4-3) lockwashers (11) and screw (13) with lockwasher (12).

Withdraw magneto (5) and gasket (14) from gear housing.

Before installing new magneto you must time the magneto to engine,

Remove flywheel screen and locate timing marks on flywheel and shroud. Refer to figure 4-6.

4-12