Exhaust Air Pump - Moaning Noise
83ford10Article No. 83-16-21
NOISE - POWERTRAIN MOAN - AT APPROXIMATELY 2,000 RPM - 5.8L UNITS
LIGHT TRUCKS 1980-83 E, F AND BRONCO
FIGURE 29:
A drumming and/or moaning noise, at approximately 2,000 RPM, may be the result of the exhaust air pump adjustment arm flange being too wide. The flange may contact the body of the air pump preventing proper pump to bracket fit (Figure 29). Visual inspection can confirm if the condition is present.
To service this condition, the following procedure is recommended:
1. Loosen alternator and air pump adjustment slot and pivot bolts.
2. Move the alternator and air pump to a position that will allow the removal of both the alternator and air pump drive belts.
3. Remove the air pump adjustment slot bolt and alternator pivot bolt from the alternator bracket, then remove the air pump adjustment arm.
FIGURE 29:
4. Grind .0625" (1/16 inch) off entire flange radius of air pump adjustment arm (Figure 29). Ensure there are no sharp burrs remaining.
5. Install air pump adjustment arm and install alternator and air pump drive belts by reversing procedure of steps 1 through 3.
6. Tension alternator belt 110-130 lbs. and tension air pump belt 80-100 lbs.
7. Torque bolts as follows: adjustment slot bolts (alternator and air pump); 24-34 ft.lbs. Air pump pivot bolt; 35-50 ft.lbs. Alternator pivot bolt; 45-55 ft.lbs.
8. Start engine to ensure noise has been eliminated and that all accessory drive components are positioned and functioning properly.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9452A83
TIME: 0.4 Hr. DLR. CODING: Basic Part No. 9B452 Code: 16