ISUZU Clutch Slave Cylinder 25.4mm Bore Size ISO/TS16949 Certified OEM Standard Replacement for NPR66 4HF1

The ISUZU Clutch Slave Cylinder Assembly with OEM numbers 8-97032847-1 / 8970328471 is a precision-engineered replacement designed for ISUZU NPR66 series trucks, compatible with 4HF1 diesel engines. This component is a core actuation element of the clutch hydraulic system, responsible for converting hydraulic pressure from the master cylinder into mechanical force to push the clutch release fork.

The clutch slave cylinder is an actuation component of the clutch hydraulic system, mounted on the transmission housing and connected to the master cylinder via hydraulic lines.

• Hydraulic Transmission: When the driver depresses the clutch pedal, the master cylinder converts pedal force into hydraulic pressure transmitted to the slave cylinder.
• Piston Actuation: Hydraulic pressure pushes the piston inside the slave cylinder outward, moving the push rod to actuate the release fork.
• Clutch Disengagement: The release fork pushes the release bearing to separate the pressure plate from the clutch disc, interrupting power transmission for gear shifting.
• Return Process: When the driver releases the clutch pedal, hydraulic pressure is released and the piston returns under spring force, re-engaging the clutch.

Primary Vehicle Applications:

Extended Vehicle Applications:

• Number Confirmation: This product number is 8-97032847-1 / 8970328471. Same series also includes 8-97032847-0 / 8970328470. Verify the specific number on the original part before ordering.
• Associated Components: When replacing the slave cylinder, it is recommended to inspect the master cylinder as both often fail around the same time.
• Brake Fluid Replacement: Replace brake fluid (DOT 3 or DOT 4) and bleed the hydraulic system when replacing the slave cylinder.
• Installation Torque: Refer to ISUZU factory workshop manual for slave cylinder mounting bolt and hydraulic line torque specifications.
• Push Rod Inspection: Inspect the push rod for wear before installation and replace if necessary.
• Professional Installation: The clutch slave cylinder is a critical clutch system component — professional installation is strongly recommended.

Installation Guidelines (Reference Workshop Manual):

Preparation:

• Confirm installation position and part number (8-97032847-1)
• Prepare tools: Socket wrench, brake line wrench, torque wrench, brake fluid (DOT 3 or DOT 4)
• Recommended to also prepare: Clutch master cylinder, brake fluid

Removing Old Slave Cylinder:

1. Park vehicle on level surface and engage parking brake
2. Prepare a container to catch residual brake fluid
3. Disconnect the hydraulic line from the old slave cylinder using a brake line wrench
4. Remove mounting bolts securing the cylinder
5. Carefully remove the old slave cylinder, note the push rod installation position and wear condition

Installing New Slave Cylinder:

1. Clean mounting surface: Thoroughly clean the transmission housing mounting surface
2. Install new cylinder: Position the new cylinder correctly and torque mounting bolts to specification
3. Connect hydraulic line: Reconnect the hydraulic line — ensure tight, leak-free connection
4. Fill brake fluid: Fill the master cylinder reservoir with DOT 3 or DOT 4 brake fluid to the correct level
5. Bleed hydraulic system: Mandatory — bleed the clutch hydraulic system to remove air from lines
6. Leak check: Inspect all connections and cylinder body — confirm no brake fluid leakage

Post-Installation Checks (Mandatory):

• Clutch pedal feel check: Depress clutch pedal — confirm moderate pedal effort, normal travel
• Shifting check: Start engine and shift through all gears — confirm smooth shifting
• Leak check: Inspect cylinder and connections for brake fluid leakage
• Road test: Perform road test — confirm smooth clutch engagement, no shudder, no slippage

Maintenance Schedule: