Flywheel/Drive Disc Service (Nissan Patrol Y60)

Note: To perform the work described below, you will need the following special equipment: a plunger-type dial gauge and a suitable heat source (blowtorch or gas torch).

Note: To gain access to the flywheel/drive plate, either the engine or transmission must be removed. The choice is left to the contractor's discretion, depending on the availability of appropriate lifting equipment.

Removal

1. Remove the engine or transmission.

2. On models with manual transmission, mark the installation position of the clutch basket on the flywheel. Gradually loosen and unscrew the mounting bolts, remove the basket from the guide pins and remove the clutch assembly.

3. Block the flywheel/drive disk from turning and unscrew its mounting bolts (see accompanying illustration).



4. After marking the flywheel/drive plate installation position on the crankshaft journal, remove it from the vehicle.

Installation

1. Installation is carried out in reverse order.

2. Make sure that the alignment marks made during dismantling are correct. Tighten the flywheel/drive disc mounting bolts to the required torque.



3. On models with a manual transmission, center the clutch slave disk on the crankshaft guide sleeve using the old gearbox input shaft or a special centering tool. Tighten the clutch basket mounting bolts in several steps, working diagonally, to the required torque.

Checking the status

1. Estimate the runout value of the flywheel/drive disk contacting the clutch disc/rotation converter (working) surface. If the runout value of both the flywheel/drive disk removed from the crankshaft and the flywheel/drive disk mounted on it exceeds 0.1 mm, the unit should be replaced.

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2. Check the flywheel working surface for cracks, deep scratches and burrs.

3. Check the crown teeth for chips, cracks and signs of wear.

Attention! Replacing the flywheel ring gear is possible, but not the drive disk!

Replacing the flywheel ring gear

1. Remove the flywheel from the car and drill a ø 3 mm hole between the two teeth of the ring gear.

Note: The hole should not be through to avoid damage to the flywheel flange.

2. Place the chisel over the drilled hole and use sharp hammer blows to split the crown.

3. Remove the ring gear from the flywheel, then remove any burrs and burrs left during removal from the mounting surface.

4. Polish several areas on the new ring gear with sandpaper and begin heating the latter until the polished areas acquire a dark blue tint.

5. Quickly place the ring gear on the flywheel with the chamfers of the teeth facing up and away from the flywheel flange. Make sure that the ring gear fits securely and is pressed tightly against the flange.

Attention! Let the crown cool naturally, do not pour water on it under any circumstances!