Service manual

ManualsBrandsUltima ManualsAutomotiveSHOVELHEAD ENGINES

CAUTION - Plating or otherwise altering S&S oil pump may

cause irreversible damage and interfere with engine

lubrication. Damages caused by altering S&S oil pump

will not be covered under warranty

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There are important differences in internal machining of oil

pump bodies for each kit. Before beginning installation,

compare pump body you received with those in Pictures 1,

1A & 2. Pump bodies are designed for specific year groups

and must not be interchanged or installed on engines other

than those they were designed for.

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Cast pump body #31-6003 for 1970-1991 models is identical

to #31-6006 body for 1992-up models except for slightly different

mounting bolt patterns. To positively identify bolt pattern, place

known oil pump gasket against pump body and note whether

lower bolt holes in gasket and body line up. Parts can also be

identified by measuring thickness of material between bottom

right bolt hole and supply gear cavity. See Picture 3.

Measurement for 1991-earlier pattern is approximately 080”.

Measurement for ‘92-up pattern is approximately .150”.

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Oil pump covers for 1992-up engines are machined

differently from covers for earlier engines. 1992-up covers have

slightly different bolt pattern, no provision for rear chain oiler,

and slotted lower left bolt holes. To identify cast covers, compare

cover you received to covers in Picture 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.

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Billet pump covers have essentialy the same differences

as cast covers as well as additional options for oil line fitting

placement. Billet covers #31-6044 and #31-6047 have

1992-up mounting hole pattern. Billet covers #31-6041 and

#31-6045 have ‘91-earlier mounting bolt pattern. See

Picture 5. Additional information regarding billet covers can

be found on pages 11 & 12.

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

#31-6002

1936 to 1991

#31-6039

1992 and later

Picture 5 Chart 1

Pump Kit Pump Pump Drive Shaft Pinion Shaft Breather

Part No. Body Cover Drive Gear Drive Gear Gear Kit

Part No. Part. No. Part No. Part. No. Part No.

31-6250 31-6001 31-6002

31-6260 31-6003 31-6002

31-6270 31-6073 31-6002

31-6262 31-6003 31-6002 33-4239

31-6272 31-6073 31-6002 33-4239

31-6263 31-6001 31-6002 33-4230 33-4237§ 33-4239

31-6264 31-6001 31-6002 33-4230 33-4232 33-4239

31-6265 31-6073 31-6002 33-4230 33-4232 33-4239

32-6266 31-6003 31-6002 33-4230 33-4232 33-4239

31-6267 31-6003 31-6002 33-4230 33-4232‡ 33-4251†

31-6261 31-6006 31-6039

31-6269 31-6006 31-6039 33-4230 33-4232‡ 33-4251†

31-6251 31-6040 31-6041

31-6252 31-6042 31-6041

31-6253 31-6043 31-6044

31-6254 31-6040 31-6041

31-6255 31-6040 31-6041 33-4230 33-4232 33-4239

31-6256 31-6042 31-6041 33-4230 33-4232 33-4239

31-6257 31-6042 31-6041 33-4230 33-4232 33-4251

31-6258 31-6043 31-6044 33-4230 33-4232 33-4251

31-6259 31-6042 31-6041 33-4239

§ Pinion shaft drive gear, part #33-4237 for 1939 to 1953 engines, is

easily distinguishable from 1954 and later gears by the inside diameter

splines machined to fit early style splined pinion shafts.†

† Breather valve gear kit, part #33-4251 for 1977 and later engines, has

a different pitch diameter from 1977 and earlier gears and can be

identified by a circular groove machined in the gear face.

‡ #33-4232 pinion shaft pump drive gear is designed to fit S&S 1958

and later style tapered pinion shaft and stock 1954 to 1989 style

tapered pinion shaft. Engines using stock 1990 and later style straight

pinion shaft must use stock pinion shaft oil pump gear.

Note: "Bold type indicates billet oil pump kits."

#31-6041

#31-6044

#31-6045

#31-6047