Exhaust Manifold - Buzzing Noise

Bulletin No.: 009/93
Issued: 7/30/93
Revised: 12/10/93

Category
F

Applicable Model/s
1990-93 MX-5 MIATA

Subject:
BUZZING NOISE FROM EXHAUST MANIFOLD AREA

This is a revised bulletin. Replace the original bulletin with this revised copy.





APPLICABLE MODELS/VINS

DESCRIPTION
A buzzing noise may be heard while the engine is running. This may be caused by one of the following:

1. A crack in the exhaust manifold heat insulator or insulator bracket(s).
2. A crack in the weld near the front flange on the front pipe insulator. The strength of the exhaust manifold heat insulator and the weld on the pipe insulator have been increased to prevent these concerns.





REPAIR PROCEDURES
Inspect the vehicle to determine which area is creating the problem. Refer to the illustrations to help identity concern areas.

3. If the noise is coming from the exhaust manifold heat insulator, replace the insulator with the new part.
4. If the noise is coming from the exhaust pipe heat insulator install a clamp band to correct the noise.





PARTS INFORMATION

NOTE:
The new heat insulator and the and old part are fully interchangeable.

WARRANTY INFORMATION

(Applies To Vehicles Covered Under Normal Warranty)
Type: A
Customer Comment Code: 82
Damage Code: 9A
Part Number Of Main Cause: B61 P 13 380D (Ex. Manifold Heat Insulator) B6Y4 40 SAX (Ex. Pipe Heat Insulator)
Quantity: 1
Operation No. / Labor Hr. F0213XRX / 0.2 Hrs. (Ex. Manifold Heat Insulator)
XXO603R1 / 0.2 Hrs. (Fr. Pipe Heat Insulator)