2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 155Get this manual
FUEL SYSTEM OMS PUMP Position O-ring seal around inlet housing flangePosition inlet housing over oil pump piston, and insert piston into oil pump borePlace poppet spring on center boss in air motor cover and twist while pushing down to wedge in place
1a-ring 2Oil pump bore
Push inlet housing down against intermediate housingRotate back and forth slightly to seat 0ring seal in groove and align screw holes in flanges
Position cover over air motor piston springPush cover straight down to compress big spring, and guide poppet spring into center of piston