S&S Cycle Big Twin Oil Pump Kits - Manual (Page 2)

2
Introduction
S&S manufactures oil pumps in both cast and billet
aluminum. Cast oil pump kits are designed to replace stock
H-D pumps on all OHV Big Twin engines from 1936 to
present except Twin Cam 88. Cast pumps retain stock
functions such as rear and primary chain oiling. Billet
pumps have no provision for rear chain oiling.
All S&S oil pumps provide same oil volume and pressure
as stock 1973 and later H-D pumps with stock drive gears.
Installing any S&S oil pump on engine from 1936 to 1967
results in a 33% increase in supplied oil volume over stock
cast iron pump. An additional 25% increase can be
achieved on engines from 1939 to 1972 if optional S&S
pinion and oil pump drive shaft drive gears are installed.
NOTE - Except for Knuckleheads, S&S recommends use
of optional pinion and oil pump drive shaft gears because
increased oil supply is usually beneficial. However, limited
rate of oil return from Knuckle top end will likely cause
problems if later drive gears are used. Even with standard
drive gears, Knuckleheads with S&S pump may require
restriction of top end oil supply. This is discussed in more
detail under NOTES on page 13.
IMPORTANT NOTES
● Chrome Plating - S&S does not recommend chrome
plating oil pump body or cover. Proper preparation for
plating requires abrasive buffing compounds. These
materials can plug critical passages and otherwise
damage oil pump. Also, it is extremely difficult to chrome
plate oil pump without altering critical machined surfaces.
Chrome in these areas or on gasket surfaces can impair
pump’s performance by altering operating tolerances. In
addition, chrome may flake and break loose causing
damage to pump and engine.
Picture 1 Picture 2
#31-6006 #31-6003
#31-6001
#31-6073
#31-6003
Picture 3
#31-6040 #31-6042 #31-6043
Billet Oil Pump Bodies
Picture 4
.080
.150