Engine System - Operation/Lubrication System CTM3274 (01JUL99) 205-6 Saran Liter Engines 060799 PN=319 LUBRICATION SYSTEM - CONTINUED An externally adjustable pressure regulating valve is located at the front of the cylinder block in the oil gallery. It controls the oil pressure and provides constant pressure in the main gallery and in the complete lubrication system. The valve consists of a valve cone held against a seat by means of a spring and plug. Pressure may be adjusted by changing the number of shims behind the valve plug. If oil pressure exceeds spring pressure, the valve cone is raised from the seat, permitting oil to bypass to the crankcase and maintain constant pressure.
An oil by-pass valve is located in the cylinder block behind the front plate and near the oil pressure regulating valve. Should the difference between the pressures in the main oil gallery and oil pump become excessive, this valve would open and let oil by-pass the filter and oil cooler to reach the main gallery faster. This valve has a permanent setting which cannot be changed. The oil filter is mounted on the right-hand side of the engine. It is a full-flow type with a spin-on type replaceable element. If the filter clogs, a by-pass valve in the element opens to keep a full flow of oil to vital engine parts. NOTE: Some high output engines are equipped with high flow oil coolers.
-UN-08MAR95 1—Oil pressure warning switch 2—Oil cooler by-pass valve 3—Oil cooler 4—Oil filter by-pass valve 5—By-pass valve CD30090 6—Oil pump 7—Oil pressure regulating valve 8—Main oil gallery 9—Lubricating oil 10—Pressure-free oil 11—Coolant from cooling system CD,3274,G205,3 -19-03NOV92 205 6