40-3005101 Rocker Arm Shaft, For Hercules 3400 series engines, both diesel and Gas 40-1093436 754-40511 radiator fan used in

754-40511 radiator fan used in the LPW line of engines

Marine engines use the newer style housing (750-49090) which has a fitting on top to bleed off any trapped air in the system

AC1 and AD1 engine

LPW/S/T engines

36016200 and P691169

40-3005101 Rocker Arm Shaft, For Hercules 3400 series engines, both diesel and Gas 40-1093436 754-40511 radiator fan used in40 3005101 Rocker Arm Shaft for the 3400 series engines, either gas or diesel This will be item number 3 in the Hercules picture. The 6 cylinder engine does take 2 shafts. *Warning* not all items are the same between the 4 and 6 cylinder valve train components. Rocker shafts are different.