S&S Cycle HVHP Oil Pump Kits for Big Twin User Manual

Page 7

1- Position pump body gasket onto crankcase with a dab of sealer.
2- Prelube the return gears.
3- Install the return side key and drive gear onto the pump drive shaft.
4- Install the return side idler gear into the pump body.
5- Push the driveshaft in toward the gearcase as far as it will go while holding driveshaft gear in gearcase in place so shaft goes through it.
6- Install pump body assembly onto the driveshaft, turn return idler gear as needed to get return gear teeth to mesh, slide pump assembly

into place and install top two mounting bolts and washers loosely.

7- Now push driveshaft from gear case end back as far as it will go towards the transmission, rotating shaft so keyway is accessible.
8- Install the feed side drive gear onto the driveshaft with counterbore facing the transmission. Slide gear all the way in until it bottoms in the

gear pocket. This will leave the drive shaft protruding from the gear with the keyway and snap ring groove exposed. Install the feed gear
key. This key is smaller than the standard oil pump drive keys used on previous S&S oil pumps. Tweezers or small needle nose pliers will
make for easier key installation. After the key is installed, install the "c" shaped retaining ring into the ring groove. Now push the driveshaft
forward towards the gear case making sure it passes through the driveshaft gear in the gearcase. Turn pump to align keyway in shaft and
drive gear. Install the driveshaft key and snap ring inside the gearcase.

Loss of oil pump drive gear snap ring or key will result in disengagement of oil pump causing loss of oil pressure and possible engine damage.

F- Installation of cover.

NOTE : A dab of Hylomar or other thin gasket sealer in corners of gasket may be used to hold gasket in place if care is taken to avoid critical areas such as
oil passages and interior of oil pump. Otherwise, gaskets should be installed dry.

Gasket sealant may interfere with engine lubrication if allowed to enter oil pump or passages machined in crankcase. Damage related to
improper use of gasket sealant will not be covered under warranty.

1- Position pump cover gasket onto pump body with a dab of sealer.
2- Install the two inboard mounting bolts with washers through the pump cover gasket and pump body, and start by a thread or two.
3- Install the pump cover, two outboard bolts with washers, but do not tighten at this time.
4- Perform the free spin procedure.

a- While continually turning oil pump drive gear in gearcase to check pump for binding, gradually tighten cover bolts in an X-pattern

to a final torque of 90-120 in-lbs, leaving the top two pump body bolts loose. If pump binds, loosen cover screws and shift pump
slightly while rotating gears. Retighten cover bolts while turning driveshaft to confirm bind- free pump operation. Pump should operate
smoothly when correctly aligned on crankcase.

b- Evenly tighten two remaining bolts to 90-110 in-lbs. If remaining bolts are inaccessible with torque wrench due to oil line fittings,

temporarily remove fittings or carefully tighten bolts with thin box-end wrench.

NOTE: Oil pump failure may result if an attempt to bypass the free spin procedure is made. The pump can be changed if you do not remove the pinion
shaft hardware but you cannot check for pump free spin. If this procedure is not performed, pump failure may result and the part will no longer be covered
under warranty.

Failure to correct bind may result in damage to oil pump or other engine parts.

G- Priming the oil pump.

Priming the oil pump will generally fall into one of three categories:

1- Engine on bench.

The engine is to be delivered to a customer or installed at a later date. Priming the pump on the bench will minimize the time spent priming
the pump after engine is installed.
a- Remove cap, spring, and check ball from oil pump.
b- Attach a piece of clear tubing approximately 12" long to the supply fitting on pump cover. Hold tubing vertically and fill with same type

of oil to be used in engine.

c- Using thumb, rotate pump drive shaft gear in normal direction of rotation. (Top of gear is moved towards right side of engine.)
d- Rotate shaft (refilling tubing as necessary) until no air bubbles can be seen in the oil exiting the check ball cavity.
e- When pump is primed, re-install the check ball, spring, and cap. Place protective cap over the supply fitting.

CAUTION