spartanic
06-30-2009, 08:14 PM
Click on the link to see the complete article (http://www.garage411.com/SteeringS13) with images check it out here: Nissan 240sx S13 Power Steering Rack and Pinion: lubrication, adjustments and more. Garage411.com (http://www.garage411.com/SteeringS13)
Power steering system consists of a rack and pinion steering gear, steering pump, fluid reservoir and flexible connecting lines. The belt-driven pump mounts on the front of the engine. The reservoir is remotely mounted. Hydraulic pressure for power-assist is produced by a rotary valve, vane type pump assembly. The pump draws fluid from the reservoir and supplies it to the valve assembly. The rotary valve in the pump valve assembly supplies pressurized fluid to the rack piston.
Certain 240SX models are equipped with a High Capacity Actively Controlled Suspension (HICAS) 4-wheel steering system. This system uses a dual power steering pump, rear power cylinder, HICAS solenoid, fail-safe valve, control unit and various sensors to control rear wheel angle. Rear wheel angle is based on vehicle speed and steering angle.
TESTING
HICAS POWER CYLINDER STROKE
1. Raise and support vehicle so that rear wheels are free to rotate. Have an assistant sit in driver's seat. With ignition off, move shift lever to Park or Neutral position (AT). Turn ignition on and immediately start engine.
2. Within 10 seconds after starting engine, turn steering wheel at least 20 degrees right and left from neutral mposition (at least 5 times) and depress and release brake pedal (at least 5 times). Set steering wheel to a point approximately 10 degrees from neutral position. Ensure rear wheels turn left and right alternately.
FYI: DO NOT depress brake pedal during the following steps.
3. Return steering wheel to neutral position. With engine running at greater than 2000 RPM, turn steering wheel 180 degrees in one direction from neutral position. Measure extension value of one power cylinder rod and retraction value of the other.
4. Turn steering wheel 180 degrees in other direction from neutral position. Measure extension value of one power cylinder rod and retraction value of the other. Each rod should extend 0.12" (3 mm) and retract 0.12" (3 mm). Total stroke is 0.24" (6 mm).
HYDRAULIC SYSTEM PRESSURE TEST
Ensure power steering belt tension and tire pressure are correct before performing hydraulic system pressure test.
1. Disconnect high pressure hose at power steering pump. Install Pressure Gauge (J-26357 ) between power steering pump and steering gear. Open valve and bleed air from system. Check fluid level.
DO NOT hold steering wheel at or near lock position for more than 15 seconds.
2. Start engine, and allow reservoir fluid temperature to reach 140-176°F (60-80°C). Set engine speed to 1000 RPM. Check pressure quickly with wheel turned to full-lock position on left and right sides.
3. Compare pressure reading with hydraulic system pressure specifications. If pressure is lower than specification, slowly close shutoff valve and note pressure. DO NOT close shutoff valve for more than 15 seconds.
4. If pressure now reads within specification, power steering pump is okay and steering gear is defective. If pressure reading is still not within specification, power steering pump is defective. If pressure reading is higher than specification, check power steering pump control valve. Remove pressure gauge and bleed system.
Click on the link to see the complete article (http://www.garage411.com/SteeringS13) with images check it out here: Nissan 240sx S13 Power Steering Rack and Pinion: lubrication, adjustments and more. Garage411.com (http://www.garage411.com/SteeringS13)
Power steering system consists of a rack and pinion steering gear, steering pump, fluid reservoir and flexible connecting lines. The belt-driven pump mounts on the front of the engine. The reservoir is remotely mounted. Hydraulic pressure for power-assist is produced by a rotary valve, vane type pump assembly. The pump draws fluid from the reservoir and supplies it to the valve assembly. The rotary valve in the pump valve assembly supplies pressurized fluid to the rack piston.
Certain 240SX models are equipped with a High Capacity Actively Controlled Suspension (HICAS) 4-wheel steering system. This system uses a dual power steering pump, rear power cylinder, HICAS solenoid, fail-safe valve, control unit and various sensors to control rear wheel angle. Rear wheel angle is based on vehicle speed and steering angle.
TESTING
HICAS POWER CYLINDER STROKE
1. Raise and support vehicle so that rear wheels are free to rotate. Have an assistant sit in driver's seat. With ignition off, move shift lever to Park or Neutral position (AT). Turn ignition on and immediately start engine.
2. Within 10 seconds after starting engine, turn steering wheel at least 20 degrees right and left from neutral mposition (at least 5 times) and depress and release brake pedal (at least 5 times). Set steering wheel to a point approximately 10 degrees from neutral position. Ensure rear wheels turn left and right alternately.
FYI: DO NOT depress brake pedal during the following steps.
3. Return steering wheel to neutral position. With engine running at greater than 2000 RPM, turn steering wheel 180 degrees in one direction from neutral position. Measure extension value of one power cylinder rod and retraction value of the other.
4. Turn steering wheel 180 degrees in other direction from neutral position. Measure extension value of one power cylinder rod and retraction value of the other. Each rod should extend 0.12" (3 mm) and retract 0.12" (3 mm). Total stroke is 0.24" (6 mm).
HYDRAULIC SYSTEM PRESSURE TEST
Ensure power steering belt tension and tire pressure are correct before performing hydraulic system pressure test.
1. Disconnect high pressure hose at power steering pump. Install Pressure Gauge (J-26357 ) between power steering pump and steering gear. Open valve and bleed air from system. Check fluid level.
DO NOT hold steering wheel at or near lock position for more than 15 seconds.
2. Start engine, and allow reservoir fluid temperature to reach 140-176°F (60-80°C). Set engine speed to 1000 RPM. Check pressure quickly with wheel turned to full-lock position on left and right sides.
3. Compare pressure reading with hydraulic system pressure specifications. If pressure is lower than specification, slowly close shutoff valve and note pressure. DO NOT close shutoff valve for more than 15 seconds.
4. If pressure now reads within specification, power steering pump is okay and steering gear is defective. If pressure reading is still not within specification, power steering pump is defective. If pressure reading is higher than specification, check power steering pump control valve. Remove pressure gauge and bleed system.
Click on the link to see the complete article (http://www.garage411.com/SteeringS13) with images check it out here: Nissan 240sx S13 Power Steering Rack and Pinion: lubrication, adjustments and more. Garage411.com (http://www.garage411.com/SteeringS13)