Engine Mount/Muffler - Vibration/Shake While Driving
Article No.96-4-17
02/12/96
^ VIBRATION - "AFTERSHAKE" - LESS THAN 72 KM/H (45 MPH) WHEN DRIVING OVER A BUMP - 2-DOOR - WITHOUT ENGINE BLOCK HEATER
^ VIBRATION - SHAKE - ABOVE 80 KM/H (50 MPH) - ALL DRIVING MODES - SMOOTH ROAD OPERATION - 2-DOOR - WITHOUT ENGINE BLOCK HEATER
LIGHT TRUCK:
1991-94 EXPLORER
This TSB article is being republished in its entirety to delete a Policy Manual reference.
ISSUE:
A vibration/shake may be felt in the seat and/or floor at speeds above 80 km/h (50 mph) and peaking near 105 km/h (65 mph) on some vehicles. This condition is not rpm dependent and occurs in all driving modes, i.e., acceleration, cruise and deceleration. An "aftershake" condition may also exist when driving over a bump at speeds less than 72 km/h (45 mph). This condition may improve with tire balancing or tire exchange, but may not be completely eliminated. This may be the result of the movement frequency of the engine aligning with the tire rotation frequency, causing the vibration/shake.
ACTION:
Confirm the vibration/shake condition occurs in all driving modes, including neutral coast. Install revised LH and RH engine mounts and a rear axle-to-frame lateral shock absorber kit. Also, install a revised muffler tailpipe assembly on all 1991-94 model years. Refer to the following Service Procedure for details.
This procedure will NOT compensate for:
^ Out-of-round or out-of-balance tire/wheel assemblies
^ Vibration resulting from abnormal tire wear
^ Other tire/wheel quality or out-of-specification issues.
Wheel/tire assemblies may require service if the vehicle is not acceptable following the new engine mount and rear axle shock absorber installation. Refer to the Noise/Vibration/Harshness (NVH) Section of the appropriate Explorer Service Manual for further details.
NOTE:
THIS TSB ARTICLE DOES NOT APPLY TO VEHICLES WITH ENGINE BLOCK HEATERS. INADEQUATE CLEARANCE EXISTS FOR NEW ENGINE MOUNT INSTALLATION WHEN THE VEHICLE IS EQUIPPED WITH AN ENGINE BLOCK HEATER.
SERVICE PROCEDURE
1. Visually inspect the tires for abnormal/irregular wear patterns. If necessary, replace the tire(s) with original equipment type and size. Set tire pressure as specified on the certification label located on the left front door pillar.
2. Check the tire/wheel assembly for correct balance and repair as necessary.
3. If the vibration/shake condition still exists, install the new Engine Mount and Rear Axle Shock Absorber Kit (F67Z-6K007-AA) as per TSB Article 96-4-15. Refer to the Instruction Sheets included with the kit for service details.
NOTE:
REPLACE EXHAUST SYSTEM ON ALL VEHICLES WITH OR WITHOUT A RESONATOR.
4. Use the following service repair procedure for replacing the muffler tailpipe assembly:
a. Hoist vehicle and remove the right rear tire/wheel assembly.
b. Remove muffler-to-catalyst attachment bolts.
c. Remove tailpipe hanger rod from insulator.
d. Remove muffler body hanger rods from insulators.
e. Remove muffler tailpipe assembly from vehicle.
f. Remove and replace gasket (E9TZ-5E241-A).
g. Install new muffler tailpipe assembly (F67A-5230-BEA).
h. Insert muffler body hanger rods into insulators.
Insert tailpipe hanger rods into insulators.
j. Assemble muffler-to-catalyst torquing bolts to 40 N-m (30 lb-ft).
k. Lower vehicle on hoist.
PART NUMBER PART NAME
F67Z-6K007-AA Engine Mount And Rear Axle Shock
Absorber Kit
E9TZ-5E241-A Gasket
F67Z-5230-BEA Muffler Tailpipe Assembly
OTHER APPLICABLE ARTICLES: 96-4-15
SUPERSEDES: 96-1-10
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage For 1992-94 Model Year Vehicles, Basic Warranty Coverage For 1991 Model Year Vehicles
OPERATION DESCRIPTION TIME
960417A Replace Engine Mount 3.4 Hrs.
Assemblies, Install Rear
Axle Lateral Shock
Absorber And Replace
Muffler Assembly
DEALER CODING
CONDITION
BASIC PART NO. CODE
6K007 79
OASIS CODES: 703000, 703200, 703300, 703400