S&S Cycle HVHP Oil Pump Kits for Big Twin - Manual (Page 4)

Picture 4
1. Pressure relief valve vent hole
2. Oil pressure passage to pinion shaft & crankpin
3. Oil pressure passage to lifters and rocker arms
4
NOTES:
•
S&S has used 1991-earlier and 1992-later style mounting bolt pattern in S&S engines for 1984-99 chassis. Confirm pattern prior to ordering HVHP pump
body or cover.
•
Oil pump gasket of known year can be used to positively identify mounting bolt pattern.
•
Machining of some aftermarket crankcases may not be consistent with a specific year group. If in doubt about modifications required for aftermarket
crankcase, contact crankcase manufacturer.
•
S&S cases have either a two or three letter code stamped above either the rear engine mount surface or above oil pump mounting surface. The first letter
designates oil pump year/style machining. "A" means the case has 1991-earlier machining, "B" indicates the case has 1992-later machining.
2- Confirm that adequate clearance exists between new oil pump body and crankcase by temporarily installing pump assembly on crankcase
and inspecting areas indicated in photo. See Picture 5 below. In some instances it may be necessary to remove small amount of material
from pump body to obtain correct fit.
NOTES:
•
If modification of pump body is necessary, remove minimum amount of material required to properly position oil pump on crankcase. Take special care
not to damage gasket surfaces. After modification, clean pump body thoroughly with suitable parts cleaner and compressed air to remove metal filings
generated during procedure. Remove all traces of solvent prior to installation.
•
S&S crankcases require no modification for S&S oil pump.
•
Failure to clean oil pump before engine assembly may result in engine damage.
•
Improper oil pump installation due to incorrect identification of crankcase year group may result in engine damage.
Picture 5
CAUTION