S&S Cycle Billet Oil Pump for Big Twin Engines User Manual
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Hole #3 in #31-6059 cover and hole #6 in #31-6061 and #31-6062 covers must not be confused. Hole #3 is high-pressure site intended for
oil pressure gauge or sending unit. Hole #6 is low-pressure site and may be used for oil supply line from tank only. Block off holes #3 and
#6 with supplied pipe plugs if not used.
Some oil pump kits include optional parts such as drive shaft gear, pinion drive gear and/or breather gear kit. See Chart 1.
CAUTION
Pump Kit
Part No.
Pump
Body
Part No.
Pump
Cover
Part No.
Drive Shaft
Drive Gear
Part No.
Pinion Shaft
Drive Gear
Part No.
Breather
Drive Gear
Part No.
31-6200
31-6048
31-6059
N/A
N/A
31-6201
31-6048
31-6060
N/A
N/A
N/A
31-6202
31-6049
31-6059
N/A
N/A
N/A
31-6203
31-6050
31-6059
N/A
N/A
N/A
31-6204
31-6050
31-6060
N/A
N/A
N/A
31-6205
31-6051
31-6061
N/A
N/A
N/A
31-6206
31-6051
31-6062
N/A
N/A
N/A
31-6207
31-6051
31-6063
N/A
N/A
N/A
31-6239
31-6050 31-6060
33-4230
33-4232
33-4253
31-6240
31-6050 31-6060
33-4230‡
33-4232
33-4250†
31-6245
31-6048
31-6060
33-4230
33-4237§
33-4253
31-6246
31-6048
31-6060
33-4230
33-4232
33-4253
31-6247
31-6051
31-6063
33-4230‡
33-4232
33-4250
31-6248
31-6049
31-6059
33-4230
33-4232
33-4253
31-6249
31-6050
31-6059
33-4230
33-4232
33-4253
31-6292
31-6048
31-6059
33-4230
33-4237§
33-4253
31-6293
31-6048
31-6059
33-4230
33-4232
33-4253
31-6294
31-6050
31-6059
33-4230
33-4232
33-4253
31-6295
31-6050
31-6059
33-4230‡
33-4232
33-4250†
31-6296
31-6051
31-6062
33-4230‡
33-4232
33-4250
31-6297
31-6050
31-6059
N/A
N/A
33-4253
§ Pinion shaft drive gear, part #33-4237 for 1939 -1953 engines, is easily
distinguished from 1954-later gears by inside diameter splines machined to fit
early style splined pinion shafts
‡ Breather valve gear kit, part #33-4251 for 1977-later engines, has different pitch
diameter than 1977-earlier gears and can be identified by circular channel
machined in gear face.
† #33-4232 pinion shaft pump drive gear fits S&S 1958-later style tapered pinion
shaft and stock 1954-1989 style tapered pinion shaft. Gear #33-4232 is 6-tooth
and requires 24-tooth oil pump driveshaft gear. Resulting 4:1 ratio is same as
stock 1973-up. Engines using 1990-later style straight pinion shaft must use
stock pinion shaft pump drive gear.
NOTE - Installation of some oil pump kits may require crankcase modifications that generate metal filings. It is imperative that all filings, dirt and other
contaminants be removed from crankcases, oil passages, oil pump and other engine components prior to assembly. Use appropriate parts cleaner and
blow out oil passages with compressed air.
Metal filings, dirt and other foreign matter can cause extensive damage to oil pump and engine.
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.
CAUTION
WARNING
Chart 1