Technical Service Bulletins
|Publication Date: JULY 1, 1996|
Some vehicles may experience a “squeal/hoot” noise during cold start-up (usually after cold soak at temperatures of -18°C/0°F (or below) coming from the Front End Accessory Drive (FEAD) area. This may be caused by the tolerance of the grease being used within the idler pulley bearing in cold temperatures.
Confirm the noise is coming from the idler pulley (or the tensioner pulley bearing for the 4.0L Explorer) and replace the idler pulley which has a revised composition grease to reduce the possibility of noise in cold temperatures. Refer to the following Service Procedure for details.
- Using a technician’s stethoscope, check for noise at the idler pulley (4.0L Explorer, at the tensioner pulley bearing).
WARNING: DO NOT RUN THE ENGINE FOR MORE THAN 30 SECONDS WITH THE FEAD BELT REMOVED.
- Remove the FEAD belt and start the engine. With the engine running, check to see if the noise is still present. If the noise is not present, proceed to Step 3. If the noise is still present, this TSB is no longer applicable.
- Replace the idler pulley with a revised idler pulley selected from the following Application Chart. Refer to the appropriate model/year Service Manual for removal and installation procedures.
NOTE: THE BOLT SECURING THE IDLER PULLEY TO THE TENSIONER ASSEMBLY IS A LH THREAD AND SHOULD BE TORQUED TO 40.7 N-m (30 LB-FT) MINIMUM. APPLICATION CHART Model Year Engine Vehicle Part Number 1991-96 3.8L Thunderbird/Cougar F6PZ-8678-AB 1994-96 3.8L Mustang F6PZ-8678-AB 1991-95 4.0L Aerostar F5PZ-8678-AA 1991-94 4.0L Explorer F5PZ-8678-AA 1997 4.6L F-150 F6PZ-8678-AB
|PART NUMBER||PART NAME|
OTHER APPLICABLE ARTICLES:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
|961409A||Replace Idler Pulley Or Tensioner Pulley||0.3 Hr.|
|BASIC PART NO.||CONDITION CODE|
497000, 702000, 702100