Clutch Slave Cylinder 8-97039704-0 8970397040 For ISUZU TFR TFS Campo 4JA1 4JB1 — Ø20.6mm Bore, Cast Iron, 98mm Mounting, OEM-Spec Aftermarket

The unit is defined by a Ø 20.6 mm piston bore, 98 mm mounting hole distance, 2 mounting holes, and a 1 × M10×1.0 connection thread. It is manufactured from cast iron (Fonte / Gusseisen), providing dimensional stability and resistance to the pressure and thermal cycling of the clutch hydraulic circuit. Reference weight is 0.97 kg (A.B.S.) / 0.83 kg (Blue Print) depending on brand and packaging.

• VerifiedBore Diameter: Ø 20.6 mm — confirmed by A.B.S. 71757 ("Diamètre du piston : 20,6 mm") and KAWE S3576 ("Kolbendurchmesser [mm]: 20,6").
• VerifiedMounting & Thread: 98 mm mounting hole distance, 2 mounting holes, 1 × M10×1.0 thread — confirmed by A.B.S. 71757.
• VerifiedMaterial: Cast Iron (Fonte / Gusseisen) — confirmed by A.B.S. 71757 and KAWE S3576.
• VerifiedVehicle & Engine Coverage: TFR/TFS Pickup (2.3, 2.3 4x4) 1991–1999 per KAWE S3576; ISUZU TFR/TFS 4JA1 (93–03) and JMC 1020 Pickup per Ecer factory data.
• VerifiedCross-Reference Density: 8970397040, 8-97039-704-0, 97039704, 94389193, 8943891930, 8944177051, 8944741230, 94474123 are consistently grouped across Oscaro, Blue Print, and A.B.S. catalogs.
• VerifiedBrand Cross-Reference: Blue Print ADZ93609, A.B.S. 71757, KAWE S3576, LPR 3127, TRW PJF148, BREMBO E59014, AISIN RG012, JAPANPARTS CY-998.
• NoteBore Tolerance: 20.6 mm is the dominant specification. 20.5 mm (JAPANPARTS/JAPKO) is a measurement tolerance, not a functionally different part. Do not reject a 20.5 mm-marked unit solely on that basis — but confirm against the original cylinder if precision matching is required.

• Clutch pedal sinks to the floor or feels spongy: Internal seal failure allows hydraulic pressure to bypass, preventing full clutch disengagement.
• Difficulty selecting gears / gear clash: Insufficient hydraulic pressure means the clutch does not fully disengage, causing hard shifting and gear grinding.
• Fluid leak at the gearbox bellhousing: A failed slave cylinder seal allows clutch fluid to escape, often visible as wetness or drips at the gearbox-engine joint.
• Clutch pedal does not return fully or has a low engagement point: A worn internal seal or pushrod prevents the pedal from returning to its rest position.
• Fluid level dropping in the clutch reservoir without an external leak: Internal seal bypass can allow fluid to enter the pushrod boot area or the bellhousing.

1. 1Confirm the required part first: Verify the original slave cylinder's bore diameter (Ø20.6 mm), mounting hole distance (98 mm), and connection thread (M10 × 1.0).
2. 2Disconnect the hydraulic line: Place a drain pan underneath, disconnect the fluid line, and plug the line immediately to prevent contamination.
3. 3Remove the mounting bolts: Unbolt the slave cylinder from the transmission bellhousing. Note the pushrod orientation.
4. 4Bench-bleed (recommended): Fill the cylinder with clean clutch fluid and bleed on the bench before installation.
5. 5Install the new cylinder: Position the 8-97039704-0 cylinder, insert the mounting bolts, and torque to specification.
6. 6Reconnect and bleed: Connect the hydraulic line, fill the reservoir, and bleed until clear, bubble-free fluid flows. Air in the circuit is the leading cause of post-replacement clutch drag.
7. 7Test operation: With the engine running, verify smooth gear engagement in all gears. The pedal should return fully and the vehicle should not creep when a gear is selected.

• Standard packing: Neutral box / color box / customer-branded packaging.
• Package contents: 1 × Clutch Slave Cylinder. Pushrod, bleeder screw, mounting hardware, and clutch fluid are not included unless explicitly stated — confirm exact package contents at inquiry.
• Suitable for: ISUZU TFR/TFS clutch repair shops, Opel Campo / JMC 1020 service providers, light commercial fleet maintenance departments, and export wholesalers.