OIL
SYSTEM
J-Series engines have pressure lubrication to all
working parts of the engine. The oil system includes
an oil intakecup, gear-typeoil pump, bypassvalve, oil
pressure gauge, full-flow oil filter, and crankcase
passages and drillings to deliver oil throughout the
engine. Oil is held in the oil base, drawn by the pump,
and delivered through theoil filter. Oil lines lead to the
rocker housing, with drillings through the crankcase
to the crankshaft bearings and camshaft front bear-
ing; crankshaft passages to connecting rod bearings
and connecting rod passages to piston pin bushings
complete the
oil
system. Thecrankcase breather in
this system aids oil consumption control, Figure
51.
Normal
oil
pressure should be
25
psi or higherwhen
the engine is at operating temperature. If pressure
drops below
20
psi at governed speed, inspect the oil
system for faulty components.
MAINTENANCE
Periodic oil system maintenance should include
changing crankcase oil, cleaning the crankcase
breather, cleaning rocker box oil lines and replacing
the oil filter.
FIGURE
51-
ENGINE PRESSURE LUBRICATION SYSTEM
41
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