Engine/Transmission - Buzzing on Deceleration

00-054

December 19, 2000

Applies To:
2000 S2000 - ALL

Buzzing From the Engine or Transmission While Decelerating

SYMPTOM

While decelerating in 3rd or 2nd gear, a buzzing or rattling comes from the engine or transmission between 4,000 and 3,000 rpm. This noise sounds similar to a heat shield rattle, and it goes away it you press lightly on the accelerator pedal or disengage the clutch.

PROBABLE CAUSE

Gear backlash in the transmission which can be minimized by clutch spring dampening.

BACKGROUND

Clearance between transmission gears (backlash) is normal and sometimes audible. In an S2000, this noise is more noticeable since the transmission is between the seats instead of up front in the engine compartment. When the vehicle decelerates, its weight, together with the pulses from the engine, excites the transmission gears, causing them to buzz or rattle. The four springs in the clutch disc hub act as a slight damper. The original clutch disc keeps the transmission very quiet when new, but as more mileage is put on the vehicle, it dampens the noise less and less. At about 4,000 miles, the noise becomes noticeable.

The countermeasured clutch disc has a different friction washer between its hub halves. If customers request the countermeasured clutch disc, advise them that the countermeasured clutch disc will initially allow more noise than a new original disc, but over time, the noise should not get noticeably worse.

CORRECTIVE ACTION

Replace the clutch disc.

PARTS INFORMATION

Clutch Disc: P/N 22200-PCX-025, H/C 6521678

WARRANTY CLAIM INFORMATION





In warranty:
The normal warranty repairs.

Out of warranty:
Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Service Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

REPAIR PROCEDURE

1. Remove the transmission (see pages 13-5 through 13-11 of the 2000-01 S2000 Service Manual).

2. Replace the clutch disc (see pages 12-7 through 12-11).

3. Reinstall the transmission (see pages 13-66 through 13-72).

4. Test-drive the vehicle to make sure it operates normally.





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