S&S Cycle Billet Oil Pump for Big Twin Engines - Manual (Page 9)

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B. Using 1⁄4 -20 tap, carefully tap hole deep enough for 1⁄4 -20 set screw provided in kit to rest flush with or slightly below gasket surface. See
Picture 12. If necessary, reapply grease to both sides of hole before inserting tap. Use straight edge to confirm set screw does not protrude
above gasket surface. See Picture 13.
Picture 13 Picture 12
NOTE - Do not tap hole deeply enough for screw to be threaded completely through hole. Goal is to have screw tighten just as it becomes flush with or
slightly below oil pump gasket surface.
C. Apply Loctite® to threads and install 1⁄4 -20 set screw.
3. Crankcase Modification - 1970-1980 Only. Drill Pressure Valve Relief Hole.
A. Install S&S® Oil Pump Drill Jig, part #53-0013, or Harley-Davidson® Crankcase Oil Passage Drilling Jig, part #94461-81 or #94461-82, on oil
pump gasket surface of crankcase.
B. Use .125" (1⁄8") drill bit to drill pressure relief hole into gear cavity. See Picture 14. Apply grease to bit and both sides of case. Withdraw drill
frequently during procedure to clear chips.
Do not perform Step 3 on stock 1936-1969 crankcases or any other crankcase with angled tappet screen passage. Drilled passage will
intersect tappet screen oil passage resulting in loss of oil pressure and serious engine damage.
4. Optional Crankcase Modification - 1948-1962 using 31-6048 pump body or 1966-1969 using 31-6049 body. Plug and Redrill Crankshaft
Feed Hole.
NOTES
•
This modification is recommended only if end oiling is used. Object of modification is to alter 1948-1962 and 1966-1969 crankcases to 1973-later style
oiling. With this system heads and lifters get primary, unrestricted oil feed supply. Main and rod bearings in lower end get secondary, low pressure oil
after top end is supplied.
•
1948-1969 style S&S® cases feature special machining, so installation of plug as described in Section 4-D is only step required to complete modification.
•
1963-1965 and other panheads with outside oilers cannot utilize Step #4, Optional Crankcase Modification, due different oil supply system.
If performed on outside oiler panhead, modification described in Step 4 will cause oil starvation to top end and extensive engine damage.
CAUTION
CAUTION
Picture 14
* All references to H-D® part
numbers is for identification
purposes only. We in no way are
implying that any of S&S Cycle's
products are orignial equipment
parts or that they are equivalent
to the corresponding H-D® part
number shown.