Flywheel - TM-5-4320-272-340019

c. Installation.

b. Cleaning and Inspection.

(1) Install the woodruff key (9, fig. 3-11) in the

(1) Discard and replace the oil filter element

and gaskets.

crankshaft keyway. Position the flywheel (8) on the

(2) Clean all remaining parts with cleaning sol-

crankshaft so that the keyway dines with the woodruff

vent (fed. spec. P-D-680); dry thoroughly. Blow out

key in the shaft keyway. Tap onto shaft with soft ham-

mer.

tubes with compressed air.

(2) Secure the flywheel to the crankshaft with

(3) Inspect the tubes for dents, cracks, dam-

nut (6) and lock washer (7).

aged tube nuts, and collapsed walls; replace damaged

(3) Drive in hand crank pin (5) so that ends

tubes.

(4) Inspect the filter body and cover for cracks,

protrude evenly.

distortion, dents, damaged threads, and other damage;

(4) Install the drive pulley (4) and secure it to

replace a damaged body or cover.

the flywheel with cap screws (2) and lock washers (3).

(5) Inspect all other parts for cracks, distor-

(5) Secure the flywheel screen (3, fig. 3-3) with

tion, and damaged threads. Replace damaged parts.

cap screws (1) and lock washers (2).

c. Reassembly and Installation. Reassembly and

installation are the reverse of removal and disassem-

3-6. Flywheel Alternator

a. Testing. Testing of the alternator and compo-

bly. Refer to figure 3-1. With drain plug in place, refill

crankcase with engine oil; refer to LO 5-4320-272-12.

nents shall be done while the parts are mounted on the

After you install the oil filter, start the engine and

engine. Test before disassembling the parts. The recti-

fier and regulator modules and the isolation diode are

check for oil leaks. Correct any leaks.

grounded to the engine so that they cannot be tested

while mounted at a remote location. Before conduct-

3-5. Flywheel

a. Removal.

ing the following tests to determine the condition of

(1) Remove the eight screws (1, fig 3-3) and

the components, check to insure that you have good

lock washers (2) securing the flywheel screen (3) to the

continuity between the modules and the engine. These

flywheel shroud (12).

are static tests which do not require that you run the

(2) After you remove the screen, take off

engine. Disconnect battery leads and uncouple the

the drive pulley (4, fig. 3-11) by removing the cap

connectors that connect the modules to the stator

screws (2) and lock washers (3) that secure it to the

leads.

flywheel (8).

(1) To check for stator continuity, use a multi-

(3) Drive out pin (5) and remove nut (6) and

meter with R x 1 scale (minimum sensitivity of 20,000

lock washer (7) that secure the flywheel to the

ohm/volts), and check as follows:

crankshaft (30).

(a) With positive meter probe connected

to black wire No. 1 and negative probe connected to

black wire No. 2, the multimeter should indicate

CAUTION

The flywheel weighs approximately 50

approximately 1.00 ohm resistance. Replace stator if

lbs. Take care when you remove it.

multimeter indicates a short (no resistance) or open

(infinite resistance) circuit.

(4) Remove the flywheel (8) by taking a firm

(b) With positive meter probe connected

hold on the flywheel fins, pulling outward while you

to black wire No. 1 and negative probe connected to

strike the end of the crankshaft with a plastic hammer.

the dark blue wire (center tap), the resistance should

Do not use a hard hammer as you may damage the

be approximately 0.50 ohm.

crankshaft and bearings. The flywheel will slide off the

(c) With positive meter probe connected

taper of the crankshaft. Take care when you remove

to black wire No. 2 and negative probe connected to

the flywheel that no damage occurs to the alternator

the dark blue wire (center tap), the resistance should

stator which is mounted behind the flywheel. Remove

be approximately 0.50 ohm.

(d) Wth the positive meter probe con-

woodruff key (9).

b. Cleaning and Inspection.

nected to black lead No. 1 and negative probe con-

(1) Clean the flywheel with cleaning solvent

nected to the red lead, the resistance should be 2.75

(fed. spec. P-D-680) and dry thoroughly.

ohms.

(2) Inspect the flywheel for bent or broken

(e) With the positive meter probe con-

fins, chipped, cracked, or broken teeth on the ring

nected to black lead No. 2 and negative probe con-

nected to the red lead, the resistance should be 1.75

gear, damaged or worn bore, distortion, or other dam-

age. Inspect the magnetic rotor insert for damage or

ohms.

(f) If any of these tests indicate a short or

signs of contact with the stator.

(3) Replace the flywheel assembly if inspec-

open circuit, you must replace the stator.

(g) Any connection between a lead and

tion indicates damage.

3-3