S&S Cycle Billet Oil Pump for Big Twin Engines User Manual

Page 19

Loss of oil pump drive gear snap ring or key will result in disengagement of oil pump causing loss of oil pressure and possible
engine damage.

G. Loosely install 2 ea. 1⁄4 x 11⁄2" bolts in upper holes in oil pump body, followed by pump cover and 4 ea. 1⁄4 x 23⁄4" mounting bolts. Do not

tighten at this time.

NOTE - 1⁄4 -24 bolts must be used on 1948-1978 Harley-Davidson® crankcases, 1⁄4 -20 bolts on later H-D® and S&S® crankcases. Check thread fit by carefully
installing bolts in crankcase before installing pump. Thread engagement should be smooth and free of resistance.

Use of incorrect mounting bolts will damage crankcase damage not covered under warranty.

H. While continually turning oil pump drive gear to check pump for binding, gradually tighten 23⁄4" bolts in X-pattern to final spec. of 90-120

in-lbs. If pump binds, loosen screws and shift pump slightly while rotating gears; pump should operate smoothly when correctly aligned
on crankcase. Retighten bolts while turning driveshaft to confirm bind-free pump operation. Evenly tighten two remaining bolts to 90-120
in-lbs. If remaining bolts are inaccessible with torque wrench due to oil line fittings, temporarily remove fittings or carefully tighten bolts
with thin box-end wrench.

I. Prime pump by removing oil pump check ball valve and injecting clean motor oil into pump supply fitting while turning oil pump drive

gear. (A large plastic squeeze bottle works well for priming pump.) Replace check ball, spring, and cap after oil fills check ball cavity.

"Air lock" or cavitation can occur if trapped air is not released from oil pump after installation. It can occur with new pump as well as
used pump that has been removed from engine, and interferes with oil circulation. It is installer's responsibility to remove trapped air by
priming pump prior to running engine and to confirm correct pump operation with engine running.

J. Install pinion shaft oil pump drive gear, pinion gear, and remaining parts in gearcase following standard H-D procedure. Note that pinion

shaft oil pump drive gear has chamfer on one side. Place gear on pinion shaft with chamfer toward shoulder on shaft, facing center of
engine. Connect oil lines.

Installing pinion shaft oil pump drive gear backwards on pinion shaft may cause stress riser resulting in eventual failure of shaft. Damage
caused by incorrect installation of gear or other parts is not covered under warranty.

9. Initial Startup and Post-operation Checks - All Years

After pump has been installed and primed, oil lines connected in correct manner (See Appendix on page 21.) and oil tank filled to correct level,
confirm oil circulation with oil pressure gauge and by removing cap from oil tank and observing oil return to tank. If oil is not seen returning to
tank, S&S recommends removing return line from tank and placing end in drain pan to confirm oil circulation.

NOTE - Engine oil circulates under pressure. Areas exposed to escaping oil should be covered with rags and engine turned off immediately after oil
circulation is confirmed to minimize oil loss.

Oil on tires or brakes can cause loss of control of motorcycle resulting in serious injury to operator and others.

A. After confirming oil circulation, run engine for several minutes and check for leaks.
B. If applicable, confirm flow rate of primary chain oiler.

CAUTION

WARNING