Component Test

Component Tests

MT285 Transaxle Noise at Idle

1. Check the transaxie fluid level.

- If the transaxie fluid level is low, fill to the correct level with the specified fluid. Re-evaluate the transaxle noise. If the noise is still present, proceed to Step 2.

2. Remove the transaxle.

3. Inspect the clutch slave cylinder.

- Inspect for leaks.

- Check for roughness by rotating the outer race while applying pressure.

- Inspect for surface scoring or burrs.

- Install a new clutch slave cylinder as necessary.

4. Inspect the transaxle input shaft.

- Inspect for damage, spline wear, burrs or rough surfaces. Repair or install new components as necessary.

5. Remove the clutch pressure plate and clutch disc.

6. Inspect the clutch pressure plate.

- Inspect the pressure plate surface for scoring, cracks or discoloration.

- Inspect the clutch fingers for discoloration, scon^ng, bent or broken segments and the spring ends that are higher or lower than the rest.

- Repair or install a new clutch pressure plate as necessary.

7. Inspect the dual mass flywheel surface with the flywheel on the engine. Look for scoring, cracks or discoloration.
















8. Inspect the dual mass flywheel with the flywheel on the engine. Check for correct internal spring operation.

- Install the flywheel holding tool.

- Using a long pry bar, rotate the secondary mass clockwise. The secondary mass should begin to engage the internal spring past the free play movement of 19 mm (0.74 in) maximum. The secondary mass should continue to rotate and engage the internal spring with increasing spring pressure. If the secondary mass does not rotate, install a new dual mass flywheel.

- Using a long pry bar, rotate the secondary mass counterclockwise. The secondary mass should begin to engage the internal spring past the free play movement of 19 mm (0.74 in) maximum. The secondary mass should continue to rotate and engage the internal spring with increasing spring pressure. If the secondary mass does not rotate, install a new dual mass flywheel.

- Using a long pry bar, rotate the flywheel back and forth until the friction control plate is centered between the secondary mass notches. Inspect the pressure plate for damage or melting. Install a new pressure plate as necessary.





















9. Inspect the dual mass flywheel with the flywheel on the engine. Check for correct secondary mass rotational free play.

- Make sure the friction control plate is centered between the secondary mass notches. The rotational freeplay check can not be carried out if the plate is off-center or damaged.

- Place a reference mark on the secondary mass of the flywheel.

- Using light hand pressure, rotate the secondary mass of the flywheel clockwise until it stops. Only use sufficient force to take up the freeplay in the secondary mass.

- Place a reference mark on the primary mass of the flywheel aligned with the mark on the secondary mass.

- Using light hand pressure, rotate the secondary mass of the flywheel counterclockwise until it stops. Only use sufficient force to take up the freeplay in the secondary mass.

- Place a second reference mark on the primary mass of the flywheel aligned with the mark on the secondary mass.

- Measure the distance between the two marks on the primary mass of the flywheel. The rotational freeplay specification is 19 mm (0.74 in) maximum.






10. NOTE: Axial or straight up and down movement of the secondary mass is normal and a new flywheel should not be installed based on this movement.

Remove the dual mass flywheel from the vehicle. Place the flywheel on a flat, level surface. Inspect the flywheel on a bench.

- Install the dial indicator onto the flywheel, the dial indicator tip should be on the secondary mass of the flywheel.

- Using light hand pressure, press downward onto the opposite side of the secondary mass until it stops. Only use sufficient force to take up the freeplay in the secondary mass. Measure the vertical movement. The secondary mass should not move more than 1.5 mm (0.05 in). Repeat the measurement in three places around the flywheel. If the flywheel is not within specification, install a new one.






11. Inspect the rear face of the engine block.

- Make sure that the two required dowel pins on the engine are installed and not damaged. If the dowel pins are missing or damaged, install new ones.

- Inspect the corresponding dowel holes on the transmission. It is acceptable to see a slight witness mark in the transmission case from a tight fitting dowel. Make sure the holes are not elongated or damaged. If the holes appear elongated, measure the hole. If the elongation is greater then 1.2 mm (0.04 in), install a new transaxle case.

- Inspect the upper and lower plates for damage or warpng. Install new components as necessary.

- Inspect the crankshaft flange and flywheel for residual threadlock compound or rust. Clean as necessary.






12. Install the dual mass flywheel and the 6 new flywheel bolts. Tighten the flywheel bolts in the sequence shown.






13. NOTE: Make sure the clutch disc is installed with the trans side label facing the clutch pressure plate.

NOTE: Install new clutch pressure plate bolts.
Install the clutch pressure plate and a new clutch disc. Tighten the bolts two turns at a time in a star pattern.

14. NOTE: Make sure to install the correct length bolt into its correct mating hole.











Install the transmission.

- Tighten the transaxle bolts in the sequence shown.