S&S Cycle Big Twin Oil Pump Kits - Manual (Page 16)

16
● 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
°
.
CAUTION - Failure to correct bind may result in
damage to oil pump or other engine parts.
D. Apply 20W50 engine oil to oil pump driveshaft
and driveshaft bushing in crankcase.
Install oil pump in crankcase in normal fashion,
placing pump drive gear #33-4230 over driveshaft
as shaft is passed through bushing and into
crankcase gear compartment.
NOTE - A dab of Hylomar or other thin gasket sealer in
corners may be used to hold gaskets 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.
CAUTION - Gasket sealant may interfere with engine
lubrication if allowed to contaminate oil pump or
passages machined in crankcase. Damage related
to improper use of gasket sealant will not be covered
under warranty.
E. Install driveshaft gear key and snap ring,
taking care not to stretch or otherwise damage
snap ring.
NOTE - Insure that drive shaft key and snap ring are
installed properly. If snap ring is installed incorrectly,
“sprung”, or otherwise damaged, it may become
dislodged or allow gear key to come out. See Pictures
36 and 37.
CAUTION - Loss of oil pump drive gear snap ring or
key will result in disengagement of oil pump causing
loss of oil pressure and extensive engine damage.
F. Loosely install 2 ea. 1 ⁄
4
x 1 1 ⁄
2
” bolts in upper holes
in oil pump body, followed by pump cover and 4
ea.
1 ⁄
4
x 2 3 ⁄
4
” mounting bolts. Do not tighten at this
time.
Note - 1 ⁄
4
-24 bolts must be used on 1948-1978 H-D
crankcases, 1 ⁄
4
-20 bolts on S&S crankcases and later
H-D crankcases. Check thread fit by carefully installing
bolts in crankcase before final assembly. Thread
engagement should be smooth and free of resistance.
CAUTION - Use of incorrect mounting bolts will cause
crankcase damage not covered under warranty.
G. While turning oil pump drive gear to check pump
for binding, gradually tighten 4 ea. 2 3 ⁄
4
” bolts in
X-pattern to final spec. of 8-10 ft-lbs. If pump
binds, loosen screws and shift pump slightly
while rotating gears; pump should operate
smoothly if correctly aligned on crankcase.
Retighten bolts while turning driveshaft to
confirm bind-free pump operation. Carefully
tighten two remaining bolts with thin box-end
wrench.
H. Prime pump by removing oil pump check valve
ball assembly and injecting clean motor oil into
pump supply fitting while turning oil pump drive
gear. (A large plastic squeeze bottle works well
for priming pump.) Replace check ball, spring, and
cap after oil fills check valve cavity.
Picture 36 Picture 37
(Correct Installation) (Incorrect Installation)