S&S Cycle Billet Oil Pump for Big Twin Engines - Manual (Page 6)

6
INTRODUCTION
Read instructions completely and become thoroughly familiar with entire installation procedure before starting. A summary chart of installation
steps is provided to help clarify installation. See Chart 2. All S&S® oil pump kits are listed with the specific year groups they fit followed by steps
required for correct installation. Select Part # that corresponds to kit and follow required steps. Read following notes to determine if optional
steps are desired.
Pump Kit Part No. Year Group Required Steps Optional Steps
31-6200 1936-'72 1,2,3,7,8,9 4 (1948-'69 only) §
31-6201 1936-'72 1,2,3,7,8,9 4 (1948-'69 only) §
31-6202 1965-'69 † 1,6,7,8,9
31-6203 1970-'91 1,3,7,8,9
31-6204 1970-'91 1,3,7,8,9
31-6205 1984-up S&S/1992-up Harley-Davidson® 1,7,8,9
31-6206 1992-up H-D® ‡ 1,7,8,9
31-6207 1992-up H-D ‡ 1,7,8,9
31-6239 1970-'77 ‡ 1,2,3,7,8,9 5 (1970-'72 only) §
31-6240 1978-'91 ‡ 1,3,7,8,9
31-6245 1948-'53 1,7,8,9
31-6246 1954-'64 ‡ 1,7,8,9
31-6247 1992-up w/pre-'89 pinion shaft ‡ 1,7,8,9
31-6248 1965-'69 † 1,6,7,8,9
31-6249 1970-'72 ‡ 1,2,3,6,7,8,9 5 §
31-6292 1948-'53 1,7,8,9
31-6293 1954-'69 ‡ 1,7,8,9 (6?)
31-6294 1970-'77 ‡ 1,2,3,6,7,8,9 5 (1970-'72 only) §
31-6295 1978-'91 ‡ 1,3,7,8,9
31-6296 1992-up w/pre-'89 pinion shaft ‡ 1,7,8,9
31-6297 1970-'72 1,2,3,6,7,8,9 5 §
S&S® recommends this optional step be performed if hydraulic lifters are used.
Installation of this kit requires use of 1973-later breather gear such as S&S part #33-4253 or #33-4250 to provide oil
to primary chain. Kits #31-6203 and #31-6204 include neither of these breather gears. Be sure correct year breather
gear, cam gear and pinion gear combination is used.
#33-4232 pinion shaft pump drive gear is designed to fit S&S 1958 and later style tapered pinion shaft and stock
1954-1989 tapered pinion shaft. Gear #33-4232 is 6-tooth and requires 24 tooth oil pump drive shaft gear. Resulting
4:1 ratio is same as stock 1973-up. Engines using 1990-later style straight pinion shaft must use stock pinion shaft
oil pump drive gear.
NOTES
•
Installation steps vary between kits and engine year groups. Perform only those steps required for your engine and the oil pump kit you will install. S&S
urges you to review installation steps for your year group several times before beginning installation or performing any crankcase modification.
•
Optional steps can update 1948-1962 and 1966-1972 crankcases to 1973-up style oiling. Step 4 applies to all 1948-1969 crankcases except 1963-
1965 models. Step 5 applies to 1970-1972 crankcases only. Both procedures separate oil supplied to top and bottom ends to increase oil pressure to
hydraulic lifters and top end. This helps prevent hydraulic lifters from collapsing at low RPM. While these two steps are not mandatory, S&S strongly
recommends them for all engines using hydraulic lifters except 1963-1965 outside oiler panheads. It is also suggested that optional S&S high speed oil
pump drive gears be used in all 1972 and earlier engines except knuckleheads. Exceptions for knucklehead and outside oiler panhead (step 4) will be
discussed in more detail later.
Failure to perform all required steps may result in engine damage.
CAUTION
Chart 2