clutch plate 3125027121，31250-0B020， 31250-28170，DT-135 31250-0B030，31250-0W020 31250-27120，31250-28171 31250-38032，31250-0B031 31250-27110，31250-27121 FOR Daihatsu, Toyota

I. Preparation and Orientation (The Most Critical Step)

• General Rule: Friction discs usually have text markings (such as "FRONT," "Flywheel Side," or an arrow). The side with text/markings faces the Transmission (Gearbox), while the unmarked/smooth side faces the Engine (Flywheel).

• Special Case (Dual Mass Flywheel): If the vehicle is equipped with a Dual Mass Flywheel (DMF), the friction disc typically has a specific damper structure. It must be installed strictly according to the instructions or markings. Reversing it will cause clutch drag or make transmission installation impossible.

• Older Daihatsu / Toyota Models: For some older light commercial vehicles (such as the Daihatsu Hijet or Toyota LiteAce), if the disc has no obvious markings on either side, the side where the damper springs protrude more or are thicker usually faces the Transmission.

• Mandatory Action: Use clutch-specific grease (usually included in the kit) or high-temperature lithium-based grease. Apply it to the inner surface of the spline hole in the center of the friction disc.

• Caution: Grease must never come into contact with the friction surfaces (the facing material). This will cause the clutch to slip. Only lubricate the splines!

II. Installation Steps

• Thoroughly clean the flywheel surface and the pressure plate (clutch cover) surface. Remove oil, rust, or old sealant. If the flywheel surface has heat spots (blueing) or grooves, resurfacing or replacement is recommended.

• Place the friction disc into the center of the flywheel.

• Place the clutch pressure plate (Cover) over it. Ensure the dowel pin holes on the pressure plate align with the dowel pins on the flywheel.

• Insert Alignment Tool: Insert a dedicated clutch alignment tool (or an old transmission input shaft) into the friction disc spline hole, passing through the flywheel pilot bearing. Ensure the friction disc is in the exact center. This is the key to a successful installation.

• Using a torque wrench, tighten the pressure plate mounting bolts in a diagonal/crisscross sequence, gradually increasing torque in multiple passes.

• Torque Standards (Reference):

• Daihatsu Passenger Cars (e.g., Charade, Terios): Approx. 15 - 23 N·m.

• Toyota Passenger Cars (e.g., Corolla, Vios): Approx. 19 - 25 N·m.

• Toyota / Daihatsu Commercial Vehicles (e.g., HiAce, Delta): Approx. 25 - 35 N·m.

• Always refer to the specific Repair Manual for your vehicle. Excessive torque will deform the pressure plate.

• After the bolts are fully torqued, gently rotate and remove the alignment tool.

III. Inspection of Mating Components (Important)

• Toyota/Daihatsu release bearings are usually maintenance-free. Strictly prohibit disassembly for cleaning (as the internal pre-applied grease will be lost).

• If the bearing makes noise or feels rough when rotated, it must be replaced. During installation, apply a small amount of high-temperature grease to the area where the bearing contacts the release fork.

• Located inside the flywheel center hole. If this bearing is seized or has excessive play, it will prevent the transmission input shaft from inserting or cause noise. It is recommended to always replace this bearing when changing the clutch.

IV. Common Problems and Taboos

• Taboo: After installation is complete, never start the vehicle and immediately rev the engine hard for testing.

• Break-in: After installing a new clutch, a "slipping" break-in period of 500-1000 km is recommended. Avoid sudden acceleration to allow the friction disc to mate perfectly with the flywheel.

• Toyota "Stiff Clutch" Common Issue: If the clutch pedal feels unusually heavy on some Toyota models (e.g., older Corollas), besides checking the cable/master cylinder, it may be due to fatigue of the pressure plate diaphragm spring. A high-quality pressure plate replacement is required.

I. Orientation Identification (Critical)

• Markings: Most friction discs have side markings such as "FRONT," "一面" (Front side), "Flywheel Side," or an arrow.

• General Rule: The side with markings usually faces the Transmission (Gearbox), while the unmarked or smooth side faces the Engine (Flywheel).

• Exceptions: Some older Daihatsu mini-vans (e.g., Hijet) or specific Toyota HiAce pressure plate designs may require the marked side to face the Flywheel. Always refer to the parts manual or pressure plate design (check diaphragm spring height before installation).

• If no markings are present, observe the damper springs (driven plate). The side where the springs protrude more or are thicker usually faces the Transmission, and the thinner side faces the Flywheel.

II. Lubrication and Cleaning (Strict Oil Prohibition)

• Action: High-temperature grease (usually included in the kit, or Toyota Genuine Part 08883-00200) must be applied to the inner spline hole of the friction disc.

• Consequence: Lack of lubrication causes stiff shifting and difficulty engaging gears. In severe cases, splines will gall, anneal, and strip.

• Taboo: Oil from fingers, drips during spline lubrication, or oil on the transmission input shaft must never touch the black friction surface or the flywheel surface.

• Consequence: Even a single drop causes clutch slippage and shudder. It is extremely difficult to clean off, usually requiring a new disc replacement.

• Before installation, thoroughly clean the flywheel and pressure plate using carburetor cleaner or industrial alcohol. Any rust or old sealant must be removed.

I. Core OEM Sources (Toyota/Daihatsu Official Technical Specifications)

II. Industry Standards and Technical Norms

III. Information Integration Notes

• Parameter Sources: Core data such as pressure plate bolt torque and friction disc orientation are derived from Toyota/Daihatsu Factory Workshop Manuals and are consistent with maintenance specifications for models such as the Corolla, HiAce, Terios, and Hijet.

• Operational Logic: Procedures such as surface cleaning, centered installation, and cross-tightening reference OEM disassembly/assembly sequences and general industry safety norms.

• Model Adaptation: Installation key points for special cases (e.g., Dual Mass Flywheels, older mini-vans) are integrated based on the technical characteristics and practical maintenance experience of Toyota/Daihatsu vehicles.

• Lubrication and Taboos: Requirements such as spline lubrication and oil prohibition on friction surfaces are derived from Toyota Genuine Parts installation guidelines and general clutch component specifications.