S&S Cycle Big Twin Oil Pump Kits User Manual

Page 4

1. Top oil return hole
2. Top oil supply hole
3. Oil pressure switch or gauge hole
4. Lower oil supply hole
5. Lower oil return hole
6. Rear chain oiler hose fitting
7. Rear chain oiler adjusting screw
8. Front chain oiler hole.

Some oil pump kits include parts such as drive shaft gear,
pinion drive gear and/or breather gear kit in addition to oil
pump assembly itself. Chart 1 lists part numbers of each
kit, oil pump body, pump cover, and any additional
components included in kit.

NOTE - Installation of some oil pump kits may require
modification to engine crankcases that cause metal
filings to be generated. It is imperative that all filings,
dirt and other contamination be removed from
crankcases, oil passages, oil pump and other engine
components prior to final assembly. Blow out oil
passages with compressed air.

CAUTION - Metal filings, dirt and other foreign matter
can cause extensive damage to oil pump and engine.

WARNING - Compressed air and particles dislodged
by compressed air are potentially harmful. Wear
protective goggles when using compressed air and
always direct air stream away from yourself and
others nearby.

Pump Installation

Read instructions completely and familiarize yourself with
installation before starting procedure. A summary chart
of installation steps is provided to help clariify installation.

1936 to 1947

1948 to 1952

1953 to 1964

1965 to 1969

1970 to 1972

1973 to 1981

1981 to Present

OIL PASSAGE

IDENTIFICATION

1. Main oil supply

2. Excess oil and pressure

valve relief

3. Front chain oil

4. Pinion shaft oil

5. Top end oil

6. Top end and tappet block oil

7. Pressure valve relief

Picture 7

Picture 6

#31-6002

1936 to 1991

#31-6039

1992 and later