Exhaust System - Droning

NO: 11-03-98

GROUP: Exhaust

DATE: Mar. 20, 1998

SUBJECT:
Exhaust Drone

MODELS:
1998 (NS) Town & Country/Caravan/Voyager
1998 (GS) Chrysler Voyager (International Market)

NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 3.3L OR 3.8L ENGINE.

SYMPTOM/CONDITION:

Exhaust drone during: normal acceleration passing through 2100 RPM and 2800 RPM cruise at 65-70 MPH at 2100 RPM; light tip in at 70 MPH passing through 2,800 RPM; Wide Open Throttle (WOT) passing through 4100 RPM.

DIAGNOSIS:

Test drive the vehicle at per the conditions described above and listen for an exhaust drone. If an exhaust drone is heard, perform the Repair Procedure.

PARTS REQUIRED:

2 04448149 Gasket, Crossover Flange
1 06504127 Nut
1 06100219 Nut
1 06504374 Bolt
2 06502058 Bolt

REPAIR PROCEDURE:

This bulletin involves modifying the exhaust crossover pipe support bracket.

1. Open the hood.

2. Remove the bolt attaching the crossover pipe support bracket to the engine.

3. Remove the four bolts attaching the crossover pipe to the exhaust manifold and separate the crossover pipe from the vehicle.





4. Mark the bolt slot in the support bracket of the crossover pipe as a guide to lengthen the slot 5 mm (3/16 in.) refer to Figure 1.

5. Use a die grinder or file to enlarge the slot in the support bracket of the crossover pipe.

6. Discard the original crossover pipe flange gaskets.

7. Install the crossover pipe to exhaust manifolds using new flange gaskets, p/n 04448149.

8. Torque the crossover pipe to exhaust manifold attaching bolts to 54 Nm (40 ft. lbs.).

9. Torque the crossover pipe bracket to cylinder head attaching bolt to 54 Nm (40 ft. lbs.).

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:

Labor Operation No: 11-10-01-90 0.7 Hrs.

FAILURE CODE: XX - Service Adjustment