Mitsubishi Pick-ups and Montero 1983-1995 Repair Guide

Flywheel and Ring Gear



See Figure 1

All Engines

The clutch cover and the pressure plate are balanced as an assembly; if replacement of either part becomes necessary, replace both parts as an assembly.

  1. Remove the transmission by using the procedures from Drive Train .

The clutch disc contains asbestos, which has been determined to be a cancer causing agent. Never clean the clutch assembly with compressed air! Avoid inhaling dust from the clutch during disassembly. When cleaning components, use commercially available brake cleaning fluids.

  1. Remove the clutch assembly, if equipped-refer to Drive Train .
  3. Most trucks equipped with automatic transmissions have separate drive plates, but the 2.0L engines have the ring gear attached to the torque converter. For all trucks except for the 2.0L engine trucks, remove the retaining bolts holding the adapter plate, the drive plate, the crankshaft adapter and the crankshaft bushing to the crankshaft. For trucks equipped with the 2.0L engine, remove the torque converter and examine the teeth on the ring gear.
  5. For trucks with manual transmissions, matchmark the flywheel and crankshaft. Loosen the retaining bolts evenly and in a crisscross pattern. Support the flywheel during removal of the last bolts and remove the flywheel.

To install:
  1. Carefully inspect the teeth on the flywheel, torque converter, or drive plate for any signs of wearing or chipping. If anything beyond minimal contact wear is found, replace the unit.

Since the flywheel is driven by the starter gear, it would be wise to inspect the starter drive if any wear is found on the flywheel teeth. A worn starter can cause damage to the flywheel.

  1. When reassembling, place the flywheel or drive plate in position on the crankshaft and make sure the matchmarks align. Install the retaining bolts finger-tight. The torque converter should be reinstalled on the transmission, not on the engine.
  3. Tighten the flywheel or drive plate bolts in a diagonal pattern and in three passes to 98 ft. lbs. (133 Nm) for 4-cylinder engines or 54 ft. lbs. (74 Nm) for 6-cylinder engines.
  5. Install and adjust the clutch assembly.
  7. Install the transmission.


If the the ring gear teeth on the tighten converter are damaged, the torque converter must be replaced. The ring gear cannot be separated or reinstalled individually.

If a ring gear is damaged on the flywheel of a manual transmission car, it is usually cheaper and easier to buy a new flywheel assembly than to change the gear. If you possess the proper equipment for heating and handling the ring gear, the procedure is as follows:

  1. With the flywheel removed from the car, tap around the ring gear to loosen it and remove it from the flywheel.

An alternate method is to drill a 0.39 in. (10mm) hole between any two teeth on the gear, being careful not to drill into the flywheel. Mount the flywheel in a vise and split the ring with a hammer and sharp chisel.

Do NOT heat the ring gear or flywheel during removal. The gear cannot be removed when heated.

  1. Heat the new ring gear to 572°F (300°C). Use heavy gloves and tongs to manipulate the gear. Since the required temperature is more than twice the boiling point of water and well above the flame point of paper, take special care to keep anything flammable out of the area.
  3. Position the ring gear onto the flywheel. It should align easily. If it does not, tap it lightly with a brass punch to get it in position.
  5. Allow the ring gear and flywheel to air cool for a period of hours. Do not attempt to cool the metal with water, oil or other fluids.
  7. Install the flywheel and tighten the bolts to specification.

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Fig. Fig. 1: Common flywheel and flexplate assembly-all engines similar