Service Manual

6-6 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 from the crankcase.
•
Install the oil pressure gauge adapter [A] and oil pressure gauge [B].
•
Run the engine and allow warm up completely.
•
Run the engine at fast idle speed and read the oil pressure gauge.
•
Stop the engine.
•
Remove the oil pressure gauge and adapter.
•
Tighten the oil passage plug.
Special Tools - Oil Pressure Gauge, 5 kgf/cm
2
: 57001–125
Oil Pressure Gauge Adapter, PT 1/8: 57001–1033
Torque - Oil Passage Plug : 3.9 N
1 m (0.40 kg
1 m, 35 in
1 lb)
If the oil pressure is below the specification, inspect the oil pump and
relief valve.
If the oil pump and relief valve are not at fault, inspect the rest of the
lubrication system.
Oil Pressure
241 to 310 kPa (35 to 45 psi)/3000 rpm