Figure 5-51. Installation of Camshaft and Crankshaft Bearings F10000RG-2

TM5-4110-234-14

TO 40R7-5-7-1

(1)

Camshaft Bearings. See figure 5-51. Replacement camshaft bearings are precision type which do not require

line reaming or line boring after installation. Coat the bearing with lubricating oil to reduce friction. Place the bearing on the

crankcase over the bearing bore with the lubricating hole (front only) in proper position. Be sure to start the bearing

straight. Press the front bearing in flush with the outside end of the bearing bore. Press the rear bearing in until past the

ignition plunger hole.

(2)

Crankshaft Bearings. See figure 5-51. New crankshaft main bearings are precision type which do not require

line reaming or line ,boring after installation.

(a) Before putting in the main bearings, expand the bearing bore by placing the casting in hot water or in an oven

heated 2000F (930C). If practical, cool the precision bearing to shrink it.

If a torch is used to heat bearing bore, apply only a little heat evenly to prevent warping and loss of

temper in the steel.

(b) When putting in either the front or rear main bearing, always aline the oil hole(s) in the bearing with the oil hole(s) in

the bearing bore. The oil passage must be at least halfway open. The cold oiled precision bearing should require only light

taps to position it.

"Easy-Out" tool to remove pin. Then install a new lock pin.

(d) Apply oil to the thrust washers to hold in place when the crankshaft is installed. The oil grooves in the thrust washer

bearings must face the crankshaft. Be sure two notches fit over lock pins.

(3)

Before installing the seals, fill the space between seals with a fibrous grease or stiff cup grease. This will

improve sealing. See figure 5-52.

(4)

When installing the gear cover oil seal, tap the seal inward until rear (spring side) of casing is 1-1/32 inch

(2.62 cm) from the mounting face of the gear cover. Install new style, thin open face seal, 1-7/64 inches (2.82 cm) from

mounting face of cover.

5-65