Caution – S&S Cycle Big Twin Engines with 3-1/2 and 3-5/8 Bore Crankcases and Special Application (SA) 4 Bore Crankcases User Manual

Page 5

INSTALL OIL PUMP (All Unassembled)

Disassemble, clean and inspect oil pump, leaving supply drive
gear, key, and snap ring in place on shaft. Refer to S&S

Oil

Pump Installation Instructions #51-1014.

NOTE - In some instances, oil pump gears have marks. To assure
proper gear mesh, marks must align when gears installed in
pump body. See Picture 9. (Marks in picture have been
darkened. They normally appear as light punch marks.)

Failure to align marks may result in gear bind and possible
damage to oil pump or other engine parts.

2. Reassemble pump, applying assembly lube to gears and gear

cavities in pump body.

Remove excess to avoid

contaminating gaskets. Rotate gears as preliminary check for
bind, and to confirm that drive gear keys properly installed.

NOTE - If bind occurs, determine whether problem is with supply
or return gears by removing idler gear from either side and
rotating pump. When binding gear is removed, pump will rotate
freely. Problem can usually be corrected by rotating gear 180˚.

NOTE - Many S&S oil pumps offer more than one location for oil
supply fitting. Lowest fitting should not be used on models with
oil tank below transmission. S&S recommends stock placement
for oil supply fitting in these bikes. See Picture 10.

Routing oil supply line to lowest fitting on models with oil
tank below transmission could allow air to enter oil pump
under certain circumstances, causing air lock, loss of
lubrication and engine damage.

3. Apply assembly lube to oil pump driveshaft and driveshaft

bushing in crankcase. See Picture 11. Install oil pump in
normal fashion, placing pump drive gear #33-4230 over
driveshaft as shaft is passed through crankcase bushing.
Refer to S&S Oil Pump Instructions and Harley-Davidson

Service Manual as needed.

NOTE - A dab of Hylomar

or other thin gasket sealer in corners

may be used to hold gaskets in place. Otherwise gaskets should
be installed dry.

Picture 9

Picture 10

Picture 11

Picture 12A

CAUTION