2-42 PERIODIC MAINTENANCE
OIL PRESSURE CHECK
Check the oil pressure periodically. This will give a good indication of the condition of the moving parts.
Oil pressure
25 kPa (0.25 kgf/cm², 3.6 psi) at 6 000 r/min, oil temp. at 50 °C (122 °F)
Low or high oil pressure can indicate any of the following conditions:
LOW OIL PRESSURE
* Clogged oil filter
* Oil leakage from the oil passage
* Damaged oil seal
* Defective oil pump
* Combination of the above items
HIGH OIL PRESSURE
* Engine oil viscosity is too high
* Clogged oil passage
* Combination of the above items
OIL PRESSURE TEST PROCEDURE
• Insert the needle-pointed probe to the lead wire coupler
(W/Bl).
• Connect the engine tachometer to the needle-pointed probe.
09900-25009: Needle-pointed probe set
09900-26006: Engine tachometer
• Remove the exhaust pipe cover 2 by removing its bolts 1.
• Remove the oil gallery plug 3.
• Install the oil pressure gauge and adaptor into the oil gallery.
• Warm up the engine.
• After warming up the engine, increase the engine speed to
6 000 r/min (observe the tachometer), and read the oil pres-
sure gauge.
• Install the oil gallery plug 3 to the specified torque.
• Install the exhaust pipe cover 2.
• Tighten the exhaust pipe cover bolts 1 to the specified
torque.
Oil gallery plug: 10 N·m (1.0 kgf-m, 7.0 lbf-ft)
Exhaust pipe cover bolt: 11 N·m (1.1 kgf-m, 8.0 lbf-ft)
09915-74511: Oil pressure gauge (600 kPa)
09940-40211: Fuel pressure gauge adaptor
Do not remove the oil pressure gauge adapter when
the engine is hot. Wait until engine cools.
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