Accessory Drive Belt - Squealing Noise

89Ford22

ACCESSORY DRIVE BELT-"SQUEALING" NOISE-4.9L, 5.0L, 5.8L AND 7.5L-THERMACTOR AIR PUMP SEIZED

NOISE-"SQUEALING" FROM ACCESSORY DRIVE BELT-4.9L, 5.0L, 5.8L AND 7.5L-THERMACTOR AIR PUMP SEIZED
Article No. 89-16-14
LIGHT TRUCK: 1988-89 BRONCO, F-150, F-250, F-350
ISSUE: A "squealing" noise from the accessory drive belt may be caused by a seized thermactor air pump. The pump may seize if water gets inside it through the corrugated paper tube routed from the intake filter.

ACTION: Modify a new corrugated paper tube by reducing its length by 9" before installation. This will reduce the possibility of water entry into the intake fitter. Also install a new thermactor air pump and accessory drive belt if required. Refer to the following procedure for service details.

1. Determine if the thermactor air pump has seized as follows:

^ Rotate the pulley on the air pump. If it turns freely, continue.

^ Check the airflow at the air pump outlet. If the airflow increases as the engine speed increases, the air pump is okay. Proceed to Step 3. If the air pump is seized, proceed to Step 2.



2. Replace the thermactor air pump if it has seized. Refer to the 1988/89 Light Truck Shop Manual, Volume B, Section 21 for service details. Refer to the following Thermactor Air Pump Application Chart for correct parts usage.
3. Inspect the thermactor air pump drive belt for signs of wear.

4. Replace the belt if it is worn or frayed. Refer to the 1988/89 Light Truck Shop Manual, Volume B, Section 27-06 for service details. Refer to the Dealer Master Parts Catalog for correct parts usage.

Figure 1:

5. Install a new corrugated paper tube on the air intake filter. Cut the paper tube nine (9) inches from the filter and throw away the excess piece, Figure 1.



Obtain an Authorized Modifications Decal and list the date, dealer number, and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.

PART NUMBER PART NAME CLASS

E5UZ-9B458-C Corrugated Paper Tube C
E5TZ-9A486-J Thermactor Air Pump B
E5TZ-9A486-D Thermactor Air Pump BM
E8TZ-9A486-C Thermactor Air Pump B
E8TZ-9A486-E Thermactor Air Pump C
E8TZ-9A486-D Thermactor Air Pump C

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage, Emissions Warranty Coverage
OPERATION DESCRIPTION TIME
891614A 4.9L F-Series & Bronco, 0.7 Hr.
Replace Pump
891614B 5.0L F-Series & Bronco, 0.5 Hr.
Replace Pump
891614C 5.8L F-Series & Bronco 0.5 Hr.
891614D 7.5L F-Series, Replace 0.5 Hr.
Pump
891614E F-Series & Bronco, Replace 0.1 Hr.
Belt
891614F F-Series & Bronco, Cut 0.1 Hr.
Tube & Install Decal If
Other Repairs Are Made
891614G F-Series & Bronco, Use If 0.2 Hr.
Only Tube Is Modified And
Decal Is Installed

DEALER CODING
BASIC PART NO. CONDITION CODE
9A486 41
OASIS CODES: 7113, 4600, 640000