Accessory Drive Belt - Chirping Noise

Article No.
94-5-12

03/09/94

^ ACCESSORY DRIVE BELT - "CHIRPING" NOISE - VEHICLES WITH 5.0L AND 5.8L ENGINES

^ NOISE - "CHIRP" FROM ACCESSORY DRIVE BELT - VEHICLES WITH 5.0L AND 5.8L ENGINES

LIGHT TRUCK:
1989-94 BRONCO, ECONOLINE, F-150-350 SERIES

ISSUE:
An intermittent or continuous "chirping" noise may come from the accessory drive belt. This is more evident at idle speed particularly under humid and moist conditions. This is caused by a misalignment at the crankshaft, power steering and water pump pulleys. The existing water pump pulleys were found to have a crown outside the center line of the belt, causing a misalignment in the system.

ACTION:
Replace the water pump pulley with a new pulley which doesn't have a crown outside the center line of the belt. Refer to the following service procedure.

1. Replace the existing water pump pulley with a new water pump pulley (F4TZ-8509-B).

2. Make sure that the power steering pulley press is flush with the end of the power steering pump shaft. Correct if necessary.





3. Replace the existing accessory drive belt with the part listed in the Parts block of this article.

NOTE:
1994 VEHICLES BUILT ON OR AFTER 10/01/93 HAVE THE NEW PRODUCTION FEAD BELT. THE NEW WATER PUMP PULLEYS WERE USED IN PRODUCTION BEGINNING 2/1/94.

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 93-3-16
WARRANTY STATUS:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage For 1992-94 Models, Basic Warranty Coverage For All Other Models

OPERATION DESCRIPTION TIME
940512A Replace Water Pump Pulley 0.7 Hr.
And Belt - Econoline
940512B Replace Water Pump Pulley 0.5 Hr.
And Belt - F-Series
940512C Replace Water Pump Pulley 0.9 Hr.
And Belt, and Adjust Power
Steering Pulley Press -
Econoline
940512D Replace Water Pump Pulley 0.7 Hr.
And Belt, and Adjust Power
Steering Pulley Press -
F-Series

DEALER CODING
BASIC PART NO. CONDITION CODE
8509 36

OASIS CODES: 497000