Clutch Master Cylinder Assembly 8980400431 For ISUZU NLR85 NM 4JJ1T 8-98040043-1

Precision-engineered clutch master cylinder converts mechanical pedal force into hydraulic pressure, enabling smooth clutch engagement and disengagement for ISUZU NLR85 and NM trucks with 4JJ1T diesel engines.

The Clutch Master Cylinder Assembly (OEM Numbers: 8980400431 / 8-98040043-1) is a premium-quality, direct replacement hydraulic component designed for ISUZU NLR85 and NM series light to medium-duty trucks equipped with the 4JJ1T turbo diesel engine. This precision-engineered master cylinder is the heart of the hydraulic clutch actuation system, responsible for converting mechanical force from the clutch pedal into hydraulic pressure.

• OE Quality: Manufactured to strict ISUZU dimensional and performance specifications for perfect fit and function
• Precision Honed Bore: Ensures smooth piston travel and consistent hydraulic pressure
• Durable Construction: High-quality housing resists corrosion and wear for long service life
• Reliable Seals: Fluid-resistant seals prevent leaks and maintain hydraulic pressure
• Smooth Clutch Operation: Enables precise, responsive clutch control
• Restores Shifting Performance: Eliminates spongy pedal feel and shifting difficulties
• Direct Replacement: Simple installation during clutch system service
• Long Service Life: Engineered for reliability in demanding commercial applications
• Cost-Effective Maintenance: Essential component for reliable clutch system performance

This clutch master cylinder assembly is specifically designed for ISUZU light to medium-duty trucks. Common applications include:

• ISUZU NLR85 - Light to Medium-Duty Trucks
• ISUZU NM - Light to Medium-Duty Trucks
• ISUZU NPR (select models with 4JJ1T engine)
• ISUZU ELF (select models with 4JJ1T engine)

• 4-Cylinder, Inline Diesel
• Displacement: 3.0L (2999cc)
• Turbocharged, Intercooled
• Valvetrain: DOHC
• Widely used in NLR85, NM, and various medium-duty trucks

1. Disconnect battery - Disconnect the negative battery cable before beginning work
2. Drain clutch fluid - Drain the clutch fluid from the reservoir and system
3. Disconnect hydraulic line - Carefully disconnect the clutch fluid line from the master cylinder
4. Remove the old master cylinder - Unbolt and remove the old master cylinder from the firewall
5. Inspect the pushrod and pedal linkage - Check for wear or damage; replace if necessary
6. Clean the mounting area - Clean the firewall mounting surface and surrounding area
7. Prepare the new master cylinder - Inspect the new cylinder and verify it matches the original
8. Install the new master cylinder - Position the new cylinder and secure with mounting bolts
9. Torque to specification - Tighten bolts to manufacturer specification
10. Connect hydraulic line - Reconnect the clutch fluid line to the master cylinder
11. Fill reservoir - Fill the reservoir with the correct type of clutch/brake fluid
12. Bleed the system - Bleed the hydraulic clutch system to remove all air from the lines
13. Check pedal feel - Test the clutch pedal for proper feel and travel
14. Reconnect battery - Reconnect the battery
15. Test operation - Start the engine and test clutch engagement and shifting
16. Road test - Test drive the vehicle to verify smooth clutch operation

• Material Verification: Confirms housing and seal materials meet OE specifications
• Dimensional Inspection: Bore size, mounting dimensions, and port positions verified against OEM tolerances
• Leakage Testing: 100% pressure-tested for internal and external fluid leakage
• Piston and Seal Inspection: Seal integrity and piston smoothness verified for reliable operation
• Surface Finish Inspection: Machined surfaces checked for proper finish
• Visual Inspection: 100% checked for casting defects, machining flaws, or damage
• Packaged Safely: Protected and securely packaged to prevent contamination and damage during transit

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea