LUBRICATING OIL COOLER - MAINTENANCE INSTR UCTIONS.
a. To perform its functions satisfactorily, the lubricating oil must be kept within the proper temperature
limits. If the oil is too cold, it will not flow freely. If the oil is too hot, it cannot support the bearing loads, it
cannot carry away enough heat, and it may result in too great an oil flow. As a consequence, oil pressure may
drop below acceptable limits and oil consumption may become excessive.
b. In performing its lubricating and cooling functions, the oil absorbs a considerable a ount of heat and
this heat must be dissipated by an oil cooler.
c. The engine is provided with an oil cooler mounted on the side of the cylinder block at the lower front
corner. To cool the lubricating oil used in marine gear, a separate oil cooler core is mounted adjacent to the
engine oil cooler.
d. Oil from the lubricating oil pump flows through a passage in the oil cooler adaptor to the oil filter,
through the oil cooler, and finally through the outlet passage in the cooler adaptor which leads to the cylinder
block oil galleries. The engine coolant is pumped through the oil cooler and completely surrounds the oil cooler
e. To ensure continuing engine lubrication should the oil cooler become plugged, a by-pass valve is
installed in the oil cooler adaptor