S&S Cycle Big Twin Oil Pump Kits - Manual (Page 8)

8
E. Install S&S Oil Pump Drill Jig, part #53-0013,
on crankcase oil pump gasket surface. See
Picture 17.
F. Wrap masking tape around .187" ( 3 ⁄
16
") drill bit
.750 " ( 3 ⁄
4
") from drill point to use as depth guide.
Using tape as guide, drill hole into pump gasket
surface .375" (
3 ⁄
8
") deep until it breaks into
passageway just tapped. (Hole to be drilled is
3/8" deep and drill jig is
3 ⁄
8
" thick - 3 ⁄
8
" + 3 ⁄
8
" = 3 ⁄
4
").
See Picture 17.
NOTE - Do not drill hole too deep. Hole must not extend
into gear cavity side of crankcases.
CAUTION - Improperly drilled oil feed hole may cause
oil to bleed off into gear cavity resulting in oil pressure
loss and possible engine damage.
G. Remove drill jig and blow air into passage to
remove chips. See Picture 18.
CAUTION - Metal filings, dirt and other foreign matter
can cause extensive damage to oil pump and engine.
WARNING - Compressed air and particles dislodged
by compressed air are potentially harmful. Wear
protective goggles when using compressed air and
always direct air stream away from yourself and
others nearby.
5. Optional Crankcase Modification - 1970-1972
only, using #31-6003 cast pump body or #31-6042
billet pump body- Plug and Redrill Crankshaft
Feed Hole
NOTE - Objective of this modification is to alter 1970-
1972 cases to 1973 and later style oiling. With this oiling
system lifters get primary, unrestricted oil pressure first.
Lower end main and rod bearings get secondary, lower-
pressure oil after top end is supplied. This modification is
recommended only if hydraulic lifters are used.
A. Wrap masking tape around .203" ( 13 ⁄
64
") drill bit
.375" ( 3 ⁄
8
") from drill point to use as depth guide.
CAREFULLY enlarge hole in Picture 18. Using
tape as guide, drill hole .375" (
3 ⁄
8
") deep. See
Pictures 19 and 20.
Picture 21 Picture 20
Picture 17 Picture 19 Picture 18