S&S Cycle Billet Oil Pump for Big Twin Engines - Manual (Page 12)

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G. Remove drill jig and blow air into passage to remove chips. See Picture 21.
Picture 21
Metal filings, dirt and other foreign matter can cause extensive damage to oil pump and engine.
Compressed air and particles dislodged by compressed air are potentially harmful. Wear protective goggles when using compressed air
and direct air stream away from yourself and others nearby.
5. Optional Crankcase Modification - 1970-1972 only, using #31-6050 pump body- Plug and Redrill Crankshaft Feed Hole
NOTE - This modification is recommended only if hydraulic lifters are used. Object of modification is to convert 1970-1972 cases to 1973 and later oiling to
give lifters unrestricted oil pressure first. Then it provides main and rod bearings with lower-pressure oil after top end has been supplied.
A. Wrap masking tape around .203" (13⁄64") drill bit .375" (3⁄8") from drill point. Carefully enlarge hole in Picture 22. Using tape as depth guide,
drill hole .375" (3⁄8") deep. See Pictures 22 and 23.
CAUTION
WARNING
Picture 22 Picture 23
NOTE - Drill bit size is very close to hole size and may distort hole if drill is not steadied.
Distorted hole may cause poor thread fit after hole is tapped.
CAUTION