S&S Cycle Billet Oil Pump for Big Twin Engines - Manual (Page 14)

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D. Remove 1⁄4 -20 set screw, apply Loctite® to threads and install screw to depth of .125" to .150" below gear cover gasket surface.
E. Install S&S® Oil Pump Drill Jig part #53-0013 on gear cover gasket surface. See Picture 27.
F. Using a .125" (1⁄8") bit, drill angled hole from passage just plugged until it breaks through pump gasket surface. See Pictures 27 and 28.
While drilling hole, withdraw drill frequently to clear chips.
Picture 27 Picture 28
G. Remove drill jig and blow compressed air into passage to remove chips. Note previous cautions regarding compressed air.
6. Crankcase Modification - 1966-1969 with kits using #31-6049 body, or 1970-1972 with kits using #31-6050 body - Drill Primary Chain
Oil Supply Hole.
NOTE - Object of Modification 6 is to update early engines to meter primary chain oil automatically through breather gear rather than manually through
external screw in pump body. Update requires use of 1973-later style breather gear such as S&S #33-4239. Gear is not included in kits #31-6202, #31-6203,
or #31-6204 but may be purchased separately.
A. Install S&S® Oil Pump Drill Jig, part #53-0013, on oil pump gasket surface as shown in photo. See Picture 29.
Picture 29
B. Using .187" (13⁄16") drill bit CAREFULLY drill hole into pump gasket surface until bit breaks out in breather valve gear cavity. See Picture 29.
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.
Contacting breather cavity wall with drill may damage machined surface and make crankcase unusable.
C. Remove drill jig and clear chips away.
D. Carefully debur hole in breather valve gear cavity.
CAUTION