Engine Lubrication System: 1E-4
Diagnostic Information and Procedures
Engine Lubrication Symptom Diagnosis
B827H11504001
Oil Pressure Check
B827H11504002
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-7)”.)
• Oil leaks (If leak is found, repair it.)
• Oil quality (If oil is discolored or
deteriorated, replace it.)
1) Remove the left footrest mudguard. Refer to
“Exterior Parts Removal and Installation in Section
9D (Page 9D-3)”.
2) Connect the tachometer to spark plug high-tension
cord.
3) Remove the main oil gallery plug (1).
4) Install the oil pressure gauge to the main oil gallery.
Special tool
(A): 09915–74511 (Oil pressure gauge set)
: 09900–26006 (Engine tachometer (solar
cell type))
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 warm up the engine, 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
LT-A400/F: 110 – 150 kPa (1.1 – 1.5 kgf/cm
2
, 16 –
21 psi) at 3 000 r/min, Oil temp. at 60 °C (140 °F)
LT-F400/F: 60 – 100 kPa (0.6 – 1.0 kgf/cm
2
, 9 – 14
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.
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
I827H1150046-01
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)
I827H1150050-01
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