Service Manual

6-8 LUBRICATION SYSTEM
Pressurized Lubrication System
The engine lubrication circuit is a pressurized system
consisting of a positive displacement pump which picks
up oil through a filter screen from the crankcase. The oil
is pumped to a replaceable oil filter cartridge, through the
engine’s oil passages to lubricate internal components,
and return to the crankcase. A pressure relief valve is used
between the oil pump and oil filter to relieve excessive oil
pressure by returning excess oil to the crankcase (see Oil
Flow Chart).
Oil Pressure Measurement
•
Remove the oil passage plug [A] from the crankcase.
•
Install the oil pressure gauge adapter [A] and oil pressure
gauge [B].
Special Tools - Oil Pressure Gauge, 10 kgf/cm²: 57001-164
Oil Pressure Gauge Adapter, PT 1/8: 57001
-1033
•
Run the engine and warm up thoroughly.
•
Run the engine at 3 200 r/min (rpm) and read the oil pres-
sure gauge.
If the oil pressure is below the specification, inspect the
oil pump and relief valve (see Oil Pump, Relief Valve In-
spection).
If the oil pump and relief valve are not at fault, inspect the
rest of the lubrication system.
Oil Pressure
294 to 588 kPa (43 to 85 psi)
Measurement Condition
Engine Oil Temperature: 50 ∼ 60°C (122 ∼ 144°F)
Engine Speed: 3 200 r/min (rpm)
•
Stop the engine.
•
Remove the oil pressure gauge and adapter.
WARNING
Take care against burns form hot engine oil that
will drain through the oil passage when the gauge
adapter is removed.
•
Apply a non-parmanent locking agent to the oil passage
plug, and tighten it.
Torque - Oil Passage Plug: 3.9 N·m (0.40 kgf·m, 35 in·lb)