Bearing Rollers

Short roller Long roller

Part Number 9101 Part Number 9171 '

.329" long .662" long

THICKNESS-0F WALL (CLOSED END) OF RETAINERS, SEE SKETCH

THICKNESS-0F WALL (CLOSED END) OF RETAINERS, SEE SKETCH

The shorter 1951 bearing rollers should not be used with 1940 to 1950 retainer part number 301-40. The longer 1940 to 1950 bearing rollers must not be used with the new 1951 retainer part number 301-51, as such a bearing assembly would lock tight when flywheels are assembled. This voald result in quick failure.

1948 to 1952 -- 61 CU. IN. AND 1948 to 1954 — 74 CU. IN. 0. H. V. ENGINE FITTING SPECIFICATIONS

PISTON CLEARANCE-- New piston fitted in cylinder, .001" to .002" clearance.

Piston shapes to cylinder and acquires more clearance after short time in service.

Measure piston at bottom of skirt, front to rear. Measure cylinder about l/2" from top of bore, front to rear. PISTON PIN IN PISTON — Light hand press fit.

PISTON PIN IN UPPER END OF CONNECTING ROD -- .0008" to .0012" loose.

PISTON RING GAP AND GROOVE CLEARANCE — With rings inserted l/2" to 3/4" from top of cylinder- Solid Type Rings .010" to .020" gap- U-Flex Oil Control Ring 11/32" overlap. Rings sould be .004" loose in ring grooves of piston. U-Flex oil control ring used as standard equipment in 1953 and 1954 - 74 OHV models LCWER CONNECTING ROD BEARING .001" to .0015" loose. '

CONNECTING RODS — .006" to .010" end play between flywheels — roller and retainer assembly should be narrower, but not more than .010" narrower than forked rod.

SPROCKET SHAFT — .0005" to .001" loose in roller bearing.

PINION GEAR SHAFT — .0008" to .0012" loose in roller bearing — .0005" to .0012" loose in cover bushing. Oil slot in cover bushing is centered with drilled feed oil passage in cover.

FLYWHEEL ASSEMBLY — .010" to .014" end play in crankcase.

CAM GEAR -- .001" to .0015'' loose in crankcase and cover bushings -- .001" to .005" end play.

INTERMEDIATE GEARS — .001" to .0015" loose on studs — .003" to .007" end play.

TAPPET GUIDES - .0005" to .001" press fit in crankcase.

VALVE TAPPETS - .ooi" to .002" loose in tappet guides.

ROCKER ARM FIT IN BEARINGS - .001" to .002" loose - .004" to .012" end play.

OIL PUMP DRIVE SHAFT - .0008" to .0012" loose in crankcase bushing.

CRANKCASE BREATHER - .001" to .00^ end play - timed with front cylinder -opens 1/8 before top center to l/8" after top center, and closes 13/l6" to 1 5/16" after bottom center.

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