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The core of installing the friction plate of a modern car clutch is "correct orientation, centered alignment, and uniform tightening". Following the simplified process below ensures the assembly effect: I. Core preparations before installation •  Ensure the new friction plate matches the vehicle model, with no oil stains, cracks on the surface, and the splined hole can be smoothly fitted onto the transmission input shaft.  •  Clean the contact surfaces of the flywheel and pressure plate, remove rust and residual friction materials, ensuring a tight fit with no gaps.  •  Prepare key tools: guide shaft (or replace with input shaft), torque wrench, lithium-based grease, cleaning cloth.II. Core Installation of Step Two and Three: 1. Grease Positioning: Apply a thin layer of grease on the inner wall of the friction disc spline hole and at the input shaft spline, insert the guide shaft into the flywheel guide bearing, and place the friction disc in the center. 2. Confirm Direction: The side marked 'TO TRANS' or 'Towards Transmission' should face the transmission; if there is no marking, align the boss side with the pressure plate and the flat side with the flywheel. 3. Tighten the Pressure Plate: Screw on the pressure plate to align with the bolt holes, tighten the bolts diagonally three times in sequence using a torque wrench according to the standard of 25-35Nm (specifically refer to the vehicle model manual).III. Finalization and Inspection •  Pull out the guide shaft and check if the friction plate can rotate flexibly without deviation.  •  Reinstall the gearbox and release mechanism in the reverse order of removal. For hydraulic clutches, bleed the air and replenish the hydraulic oil.  •  Adjust the pedal free travel to 15-25mm, start the engine for testing: if shifting is smooth without slipping/shaking, the installation is qualified.Key Taboos •  It is forbidden for the friction plate to get stained with oil, otherwise it will cause ablation and slipping.  •  Not using the guide shaft may easily cause the friction plate to skew, leading to abnormal noise or early wear.

The core precautions for installing the clutch friction disc of modern automobiles revolve around "avoiding assembly failures and extending component life". The key points are as follows: 1. Precautions before installation •  Strictly check the model of the friction disc to ensure it completely matches the vehicle model and the spline specifications of the transmission input shaft, so as to avoid spline jamming or excessive clearance.  •  Thoroughly clean the contact surfaces of the flywheel and pressure plate, ensuring no oil stains, rust, or residual friction powder, otherwise it will lead to slipping during engagement and poor heat dissipation.  •  Check the flywheel end face runout (generally not exceeding 0.2mm) and wear depth (grooves ≤ 0.5mm). If exceeding the standard, grinding or replacement is required to prevent uneven force on the friction disc.If the release bearing or fork is loose or makes abnormal noise, it needs to be replaced synchronously to avoid affecting the clutch release effect.II. Precautions During Installation •  The direction of the friction plate must not be reversed. It is necessary to strictly follow the marks ("TO TRANS" "Facing the gearbox"). Reversing it will lead to incomplete disengagement and inability to shift gears.  •  Greasing the spline should be "thin and even". Only apply a small amount of lithium-based grease to the inner wall of the spline hole of the friction plate and the input shaft spline. It is strictly prohibited to apply it to the working surface of the friction plate.  •  It is necessary to use a guide shaft (or replace it with an input shaft) for positioning to ensure that the center of the friction plate is aligned with the center of the flywheel. Otherwise, it will cause starting jitter and abnormal noise.  •  The pressure plate bolts should be tightened "diagonally in 3-4 stages step by step". Use a torque wrench to tighten them to the specified value for the vehicle model (usually 25-35Nm) to avoid pressure plate deformation caused by uneven tightness of the bolts.III. Precautions after Installation •  The hydraulic clutch needs to be completely bled. Repeatedly press the pedal until no air bubbles are discharged from the oil pipe. Replenish the specified type of hydraulic oil to prevent incomplete disengagement.  •  Adjust the pedal free travel to 15-25mm to ensure the pedal returns smoothly without jamming or excessive softness.  •  During the test run, first check at idle in neutral, then perform low-speed gear shifting tests. Observe for slipping, shaking, or abnormal noises. If any problems are found, stop the machine immediately for inspection; do not force driving.IV. Taboo Items •  It is forbidden to touch the working surface of the friction plate with oil-stained hands or tools, as oil stains will reduce the friction coefficient and cause ablation.  •  Direct installation without the guide shaft is not allowed, which may easily cause the friction plate to be skewed, aggravate wear and even damage the input shaft of the gearbox.  •  Avoid assembling the flywheel/pressure plate without cleaning it first; residual impurities will lead to early wear of the friction plate and uneven force application.

References：The content you mentioned regarding "Precautions for Installing Clutch Friction Plates in Modern Automobiles" does not have a clear single source. Its content is a synthesis of knowledge from various sources such as automobile repair manuals, professional automotive websites, and automobile maintenance experience. For example, multiple articles on Pacific Auto Network (such as "What are the precautions for installing clutch friction plates" and "How to correctly install clutch friction plates") have mentioned similar installation precautions. In addition, the original factory repair manual for the Hyundai Elantra also contains specific requirements and precautions for the installation of clutch friction plates.