Suzuki DF70A Service Manual page 60

1A-8 Engine General Information and Diagnosis:
Low Oil Pressure Caution System
Condition:
Immediate activation of the system when the oil pressure switch is turned "ON" due to an engine oil pressure drop
below 100 kPa (1.0 kg/cm
Action:
Engine speed
Caution lamp
Caution buzzer
NOTE
If the engine is automatically stopped due to the caution system, the engine can be started again.
However, the caution system will repeatedly activate until the cause is eliminated.
Reset:
Stop the engine and check the engine oil level. Refill the engine oil to the correct level if it is below the low oil level
mark.
If the engine oil level is correct, the following causes may be considered:
• Improper oil viscosity.
• Malfunctioning oil pressure switch.
• Clogged oil strainer or oil filter.
• Worn oil pump relief valve.
• Oil leakage from the oil passage.
• Excessive wear / damage of oil pump.
NOTE
The low oil pressure caution system will reset when the oil pressure is restored to over 100 kPa (1.0
kg/cm , 14 psi.) at approx. 1 000 r/min. or less engine speed operation.
2
The engine must be stopped and checked immediately once the system is activated.
Overheat Caution System
Condition 1 (Maximum temperature)
Immediate activation of the system when:
• Cylinder temperature reaches 120 °C (248 °F)
• Exhaust manifold temperature reaches 114 °C (237.2 °F)
Condition 2 (Gradient temperature – Temp. rise vs. Time)
Immediate activation of the system when:
• The average temperature difference between three consecutive 10 second measurement periods of the cylinder
temperature sensor, at engine speeds of 500 r/min or higher, exceeds the limits as shown below.
Temperature Range
88 – 99 °C (190 – 210 °F)
99 °C – (210 °F –)
• The average temperature difference between three consecutive 10 second measurement periods of the exhaust
manifold temperature sensor, at engine speeds of 500 r/min. or higher, exceeds the limits as shown below.
Temperature Range
80 – 95 °C (176 – 203 °F)
95 °C – (203 °F –)
2 , 14 psi.) while the engine is running.
• Automatically reduced to approx. 1 000 r/min. maximum by an intermittent fuel
injection signal.
• The engine automatically stops 3 minutes after the caution system is activated.
• "OIL" lamp lights continuously.
• "REV-LIMIT" lamp lights continuously during engine speed rev-limiter
activation (1 000 r/min, or higher).
• Sounds in a series of long (1.5 sec.) beeps.
Temperature Difference
Approx. 8 °C (14.4 °F)
Approx. 1.5 °C (2.7 °F)
Temperature Difference
Approx. 14 °C (25.2 °F)
Approx. 1.7 °C (3.1 °F)