S&S Cycle Big Twin Oil Pump Kits - Manual (Page 11)

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Fitting should be directed toward flat,
machined surface of cover for rigid
OEM oil lines, otherwise position fitting
for most convenient oil line installation.
2. If rigid OEM lines are to be used, install
compression fitting #50-8120 (H-D
#63523-92A) in 90
°
elbow fitting.
Otherwise install hose fitting #31-6009.
3. Install #31-6007 1 ⁄
8
-27 pipe plug in hole
#1 in top of pump cover.
3. Primary Chain Oil Supply
a. 1936-1964
1. Install #31-6028 1 ⁄
16
-27 pipe plug in
hole #8 in top of cover.
2. Install #31-6026 adjuster screw, #31-6035
brass washer, and #31-6027 lock nut into
threaded hole in side of pump body.
Bottom screw two or three times to seat
properly. See Picture 32.
NOTE - Chain oiler adjusting screw has tapered end and
must be used. Substituting standard machine screw for
tapered screw will result in large oil loss out breather.
3. Turn screw out 1 ⁄
2
turn and tighten
locknut against brass washer and
body.
NOTE - After engine has been run for a while it may be
necessary to adjust screw to achieve desired oil flow to
primary chain. Final screw setting is usually closer to fully
closed position.
CAUTION - Overtightening screw may damage
threads or adjusting screw seat in pump body.
b. 1965-1984 engines with primary chain
drive and dry clutch.
1. Install #31-6010 hose fitting in
threaded hole #8 on top of pump
cover.
2. Connect #31-6010 fitting to primary
chain oiler line after pump is installed.
3. For 1965-1972 engines using #31-6001
pump body, install #31-6026 adjuster
screw, #31-6035 brass washer, and
#31-6027 lock nut into threaded hole in
side of pump body. See Picture 32.
Bottom screw two or three times to seat
screw. Turn screw out approximately
1 1 ⁄
2
turns and tighten locknut against
brass washer and oil pump body.
NOTE - Above setting should provide 1 to 1 3 ⁄
4
oz’s/minute
oil flow to primary chain @ 2500 RPM. This can be
confirmed after engine has reached operating temperature
by disconnecting hose to primary chain, operating engine
at 2500 RPM and measuring oil delivered into measuring
container during one minute.
CAUTION - Overtightening adjustment screw may
damage oil pump body.
4. No adjusting screw is provided for
1965-1969 engines using #31-6073
pump body because primary chain oil
is metered by breather gear.
NOTE - Use of #31-6073 oil pump body requires that
Step #6 be performed and that 1973-later style breather
gear such as S&S #31-4239 be used.
c. 1984-later engines with sealed primary -
Install #31-6028 1 ⁄
16
-27 pipe plug in hole
#8 on top of pump cover.
d. All engines with primary belt drive
1. Install #31-6028 1 ⁄
16
-27 pipe plug in
hole #8 on top of pump cover.
2. For 1936-1964 engines using #31-0001
pump body, loosen locknut and screw
adjusting needle into side of pump body
until oil supply to primary chain is
completely shut off, then retighten
locknut. Do not overtighten locknut or
adjusting screw.
NOTE - Installing machine screw #31-6029 in pump
body instead of adjusting screw will result in large oil
losses out crankcase breather. Tapered adjusting screw
#31-6026 must be used for proper adjustment of oil
flow to primary chain.
CAUTION - Overtightening adjustment screw may
damage oil pump body.
4. Optional Rear Chain Oiler - 1936-1991 models
With chain drive
a. Perform following steps if rear chain oiler
is desired:
1. Install #31-6038 hose fitting in hole #6
in pump cover. See Picture 4.