S&S Cycle Big Twin Oil Pump Kits - Manual (Page 10)

10
B. Using .187" ( 3 ⁄
16
") drill bit CAREFULLY drill hole
into pump gasket surface until bit breaks out in
breather valve gear cavity. See Picture 26. If
modification is done while engine is still
assembled, apply grease to both sides of case to
help catch chips.
NOTE - Drill hole slowly and carefully to avoid contacting
opposite wall of cavity when drill breaks through.
CAUTION - Contacting breather cavity wall with drill
may damage machined surface.
C. Remove drill jig and clear chips away.
D. Carefully debur hole in breather valve gear cavity.
7. Oil Pump Cover Assembly
Customer must install oil line fittings in pump cover
before installing oil pump. Section A applies to cast
covers. Section B applies to billet covers.
A. Cast Cover
NOTE - Oil line fitting placement on S&S pump may differ
from stock pump. Follow S&S instructions for installation
of supply and return fittings. Prior to installation coat
threads of steel fittings with anti-seize compound to
prevent galling.
CAUTION - Improper installation of oil lines or fittings
may result in parts damage not covered under
warranty.
1. Oil Supply - Oil supply line fitting can be
installed at either of two locations in most S&S
oil pump covers. Hole #2 marked “S” on cast
pump cover is normally used for 1991-earlier
engines. See Picture 5. Hole #4 in face of
pump cover is normally used for 1992-up
engines. Holes #2 and #4 may be used
interchangeably for custom applications but
hole not used must be plugged with #31-6007
1 ⁄
8
-27 pipe plug.
Steps below are typical for year groups shown.
a. 1936-1991
1. Install 90
°
elbow fitting #31-6008 in
hole #2 marked ìSî in top of pump
cover or hole #4 in face of pump cover.
2. Install hose fitting #31-6009 in elbow
fitting installed in step a.
3. Install #31-6007 1 ⁄
8
-27 pipe plug in hole
#4 in face of pump cover.
b. 1992-up
1. Install 90
°
elbow fitting #31-6008 in
hole #4 in face of pump cover.
NOTE - Elbow fitting must be installed in hole #4 with
opening pointing down for use with OEM rigid oil lines.
2 . Install hose fitting #31-6009 in elbow
fitting installed in step a.
3. Install #31-6007 1 ⁄
8
-27 pipe plug in
hole #2
2. Oil Return - Oil return line can be
connected to pump at either of two
locations. Hole #1 (marked "R") on top of
cover is normally used for 1991-earlier
engines. Hole #5 in bottom of pump cover
is normally used for 1992-up engines.
Return hole not used must be plugged with
#31-6007
1 ⁄
8
-27 pipe plug. Steps below are
typical for year groups shown.
a. 1936-1991
1. Install 90
°
elbow fitting #31-6008 in
hole #1 in top of pump cover.
2. Install hose fitting #31-6009 in elbow
fitting installed in step a.
3. If applicable, install #31-6007 1/8-27
pipe plug in hole #5 in bottom of pump
cover.
NOTE - Earlier S&S oil pumps have only one location for
oil return.
b. 1992-up
1. Install 90
°
elbow fitting #31-6008 in
hole #5 in bottom of pump cover.
Picture 26