Rear bearing cup

renew hub which includes oil seal and bushing. Lubricate with engine oil through plug hole in side of hub.

On models BF, BG & R, fan blades are attached to the forward end of the coolant pump impeller shaft and hence no o^'^erhaul procedure is involved. Fan blades unit can be removed without removing the radiator. unit out of the housing. Shaft and bearing are sold only as a unit. If seal contacting surface of impeller is scored or pitted, it should be refaced or a new one installed. Apply a coating of thin Permatex on seal unit then install same with graphite shoulder toward the impeller.

COOLANT PUMP

81. Models BF, BG & R tractors are

1/

system.

equipped with a permanently lubricated packless type pump shown in Fig. A17. To remove pump from engine without removing the radiator, it may be necessary in some installations to unscrew the one pump-to-cylinderblock stud from the cylinder block.

To disassemble the pump proceed as follows: Remove fan blades. Using a suitable jaw type puller remove fan hub f]'om shaft. Support pump body suitably and press the shaft out of the impeller, and pump body in the direction towards the fan. Press the seal

ELECTRICAL

IGNITION

89A. Model A tractor engines are equipped with either a Wico C1604 high tension magneto or a Delco-Remy 1111714 or an Auto-Lite IAD-4023A battery ignition distributor. Model BF, BG & R tractors are equipped with a Delco-Remy 1111736 battery ignition distributor. Model V tractors are equipped with a Delco-Remy H11715 or an Auto-Lite IAD-4010A or IAD4010C battery ignition distributor. 90. TEVDNG WICO C1604 MAGNETO. Breaker point opening is 0.014- 0.016 inch. Crank engine until Number 1 cylinder is on compression stroke, then crank slowly until mark "DC" on fiywheel appears in center of timing hole in right side of bell housing. Turn magneto shaft backward until magneto rotor contact is under Number 1 cylinder contact of magneto distributor cap. Install magneto on engine. If magneto coupling does not align with slots in governor shaft, refer to paragraph 67 for timing governor gear. After magneto is installed, turn engine backwards past the "SPK" mark (if flywheel is so marked) on flywheel but not far enough back to engage impulse coupling, then slowly turn engine in direction of rotjition until "SPK" mark on flywheel is in center of timing hole. Rotate magneto on its mountings until breaker points are just opening. When checking timing with a neon timing light, this **SPK" mark should appear in center of timing hole when engine is running faster than 500 rpm. To check inipulse coupling trip point, turn engines in direction of rotation with switch oflE until impulse trips for Number 1 or Number 4 cylinder, at which time the "DC" center of timing hole.

Fig, AUi~Fan assembly for models A and V which are cooled by the thermo siphon

mark on flywheel should be visible in

1. 2. Hub ajjsembl Gasket y 3. 4. 5. Bronze washer Spindle Thrust nut assemhly 6. 7. Blade assembly Oil plug

91. BATTERY DISTRIBUTOK TIMING. Breaker point opening; for AutoLite distributor is 0.020 inch; for Delco-Remy, 0.018 inch. Wilii Number 1 cylinder on compression stroke, crank engine slowly until "DC" mark on flywheel is in center of timing hole in bell housing. (On the A, BF, BG & R tractors, timing hole is on right side of bell housing; on model V, left side.) Install distributor with rotor under Number 1 cylinder contact of distributor cap. With rotor held in this position, rotate distributor housing clockwise until breaker points are just opening and tighten lockscrew.

GENERATOR

92. Model A tractors have been equipped with Auto-Lite GAS-4169A, Auto-Lite GAS-4165B or Delco-Remy 1101851 generators, models BF, BG & R with Delco-Remy 1101856 generator and model V tractors with DelcoRemy 1101856 or Auto-Llte GAS4169A generators.

STARTING MOTOR

93. Model A tractors have been equipped with Auto-Lite MZ4098 and Delco-Remy 1109602 starters, models BF, BG & R with Delco-Hemy 1109609 starter and model V with Delco-Remy 1109604 or Auto-Lite MZ4130 starter.