Engine - Loss of Engine Oil Pressure After Oil Change

84chevy05

Number: 84-149

Section: 6B (VI)

Date: June, 1984
Subject: POSSIBLE LOSS OF ENGINE OIL PRESSURE FOLLOWING AN OIL CHANGE


Model and Year: ALL MODEL YEARS TRUCKS/ PASSENGER CARS WITH 5.0L AND 5.7L V8 ENGINES AND KC4 ENGINE OIL COOLERS
TO: ALL CHEVROLET DEALERS

Some vehicles equipped with 5.0L and 5.7L V8's and engine oil coolers (RPO KC4) may encounter a "no engine oil pressure" after an oil change or hot soak. This condition may be caused by trapped air in the oil cooler assembly.

Performing the following steps should eliminate any additional occurrences:

1. Remove the engine oil filter.

2. Remove the cooler lines from the cooler adapter assembly.

3. Remove the two (2) cooler adapter to engine block attaching bolts.

Cooler Adapter - Air Bleed Holes:

4. Drill two (2) 1.6 mm (1/16 in.) air bleed holes in the cooler adapter as shown in the attached graphics.
5. Clean adapter with a suitable solvent making sure all metal chips are removed.

6. Reinstall the adapter and torque the attaching bolts to 9 N-m (80 in.lbs.).

NOTICE: Replace the adapter seal and gasket using the appropriate part number assigned to the engine RPO.

7. Reinstall the cooler lines and oil filter.

8. Start engine and check for oil leaks.

Labor Operation Number: T1111

Labor Time : .6 hours