Isuzu N-Series. Service manual — part 946
7B-20 Automatic Transmission (Smoother)
Input Shaft Speed Sensor
Removal
1. Connector
2. Input shaft speed sensor
Inspection
• Replace if the harness, the connector or the seal is
damaged.
• Measure the resistance between terminals.
Replace if the resistance between 1 — 2 is not
within 1.5 to 2.1 k
Ω.
Installation
1. Input shaft speed sensor
• Apply 5W-30 engine oil to the sensor O-ring,
and install.
Tighten:
9 N
⋅m (0.9 kg⋅m / 6.6 lb⋅ft)
2. Connector
N7A1025E
N7A1026E
Automatic Transmission (Smoother) 7B-21
Turbine Speed Sensor
Removal
1. Connector
2. Turbine speed sensor
Inspection
• Replace if the harness, the connector or the seal is
damaged.
• Measure the resistance between terminals.
Replace if the resistance between 1 — 2 is not
within 1.5 to 2.1 k
Ω.
Installation
1. Turbine speed sensor
• Apply oil (Besco ATF III) to the O-ring and
clutch housing hole, and install.
Tighten:
9 N
⋅m (0.9 kg⋅m / 6.6 lb⋅ft)
2. Connector
N7A1027E
N7A1026E
7B-22 Automatic Transmission (Smoother)
Transmission Fluid Cooler Circuit
Removal
1. Remove the Smoother oil pan drain plug and O-
ring.
• Drain the oil (Transmission fluid). When
draining the oil, check the oil amount, and
check for metal bits and foreign matter.
2. Disconnect the transmission fluid cooler pipe
connection.
3. Remove the transmission fluid cooler pipe from the
clutch housing.
4. Remove the clip, and remove the transmission fluid
cooler pump.
Installation
1. Install the transmission fluid cooler pipe in the
clutch housing.
Tighten:
39 N
⋅m (4.0 kg⋅m / 28.8 lb⋅ft)
Caution:
Use a new gasket.
2. Connect the transmission fluid cooler pipe.
Tighten:
44 N
⋅m (4.5 kg⋅m / 32.5 lb⋅ft)
3. Install the clip on the transmission fluid cooler pipe.
Tighten:
20 N
⋅m (2.0 kg⋅m / 14.8 lb⋅ft)
4. Install the Smoother oil pan drain plug and O-ring.
Tighten:
40 N
⋅m (4.1 kg⋅m / 29.5 lb⋅ft)
5. Supply transmission fluid (Besco ATF III) from the
oil filler tube to the Smoother.
Automatic Transmission (Smoother) 7B-23
Flushing The Transmission Fluid Cooler Circuit
Inspection
In order to prevent trouble following Smoother repair,
flushing of the cooler circuit is required when any of the
following conditions exist.
• When a large volume of debris comes out of the
cooler circuit
• When abnormal wear is discovered while
disassembling the Smoother
• When abnormal wear is discovered in the clutch
facing or when impurities are discovered in the oil
Procedure
1. Disconnect the transmission fluid cooler pipe from
the clutch housing and oil cooler.
2. Use cleaning solvent and pressurized air to clean
the oil cooler and pipes.
Caution:
The maximum air pressure should be 197kPa {2kg/
cm
2
}.
3. After using the air to dry the cleaning solvent in the
oil cooler and pipes, clean with transmission fluid.
4. Connect the cooler circuit, and then fill with
transmission fluid.
Tighten:
44 N
⋅m (4.5 kg⋅m / 32.5 lb⋅ft)
5. Start the engine and check for transmission fluid
leaks from the cooler circuit.
6. Check the transmission fluid level and replenish if
it is low.
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