Engine Lubrication System: 1E-5
Diagnostic Information and Procedures
Engine Lubrication Symptom Diagnosis
B837H11504001
Oil Pressure Check
B837H11504002
Check the engine oil pressure periodically. This will give
a good indication of the condition of the moving parts.
NOTE
Before checking the oil pressure, check the
following.
• Oil level (Refer to “Engine Oil and Filter
Replacement in Section 0B (Page 0B-10)”.)
• Oil leaks (If leak is found, repair it.)
• Oil quality (If oil is discolored or
deteriorated, replace it.)
1) Remove the right under cowling. Refer to “Exterior
Parts Removal and Installation in Section 9D
(Page 9D-11)”.
2) Start the engine and check if the oil pressure
indicator light is turned on. If the light stays on, check
the oil pressure indicator light circuit. If the circuit is
OK, check the oil pressure in the following manner.
3) Remove the main oil gallery plug (1).
4) Install the oil pressure gauge and attachment to the
main oil gallery.
Special tool
(A): 09915–74521 (Oil pressure gauge hose)
(B): 09915–74540 (Oil pressure gauge
attachment)
(C): 09915–77331 (Meter (for high
pressure))
5) Warm up the engine as follows:
Summer: 10 min. at 2 000 r/min
Winter: 20 min. at 2 000 r/min
6) After warming up, increase the engine speed to 3
000 r/min (Observe the tachometer), and read the oil
pressure gauge.
If the oil pressure is lower or higher than the
specification, the following causes may be
considered.
Oil pressure specification
100 – 400 kPa (1.0 – 4.0 kgf/cm
2
, 14 – 57 psi) at 3
000 r/min, Oil temp. at 60 °C (140 °F)
Condition Possible cause Correction / Reference Item
Engine overheats Insufficient amount of engine oil. Check level and add.
Defective oil pump. Replace.
Clogged oil circuit. Clean.
Clogged oil cooler. Clean or replace.
Incorrect engine oil. Change.
Exhaust smoke is dirty or
thick
Excessive amount of engine oil. Check level and drain.
Engine lacks power Excessive amount of engine oil. Check level and drain.
1
I837H1150003-01
High oil pressure Low oil pressure
• Engine oil viscosity is too
high
• Clogged oil passage
• Combination of the
above items
• Clogged oil filter
• Oil leakage from the oil
passage
• Damaged O-ring
• Defective oil pump
• Combination of the
above items
(A)
(B)
(C)
I837H1150004-01
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