Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Valve Body: All Technical Service Bulletins
A/T Control Valve - Cleaning and Service Procedures
NUMBER:
86-B-47
GROUP:
7A-Automatic Transmission
DATE:
March, 1986
SUBJECT:
ALL THM TRANSMISSION ASSEMBLIES - CONTROL VALVE ASSEMBLY CLEANING/SERVICING PROCEDURES
MODELS:
ALL LIGHT DUTY MODELS WITH AUTOMATIC TRANSMISSIONS
The following information is provided as a recommended procedure for cleaning/servicing all automatic transmission control valve assemblies when:
^
Diagnosis indicates a stuck or sticking valve(s).
^
A transmission pump or torque converter malfunction requires a complete unit overhaul.
EQUIPMENT AND WORK AREA
Workbench
^
Must be clean and free of any foreign material (dirt, grease or other contaminants).
^
Work area should be large enough to allow for the disassembly of the control valve assembly and the layout of each valve train.
Tools *Should be cleaned with solvent before and during the disassembly procedures to ensure they are free of any grease or dirt that may contaminate
the control valve assembly.
Solvent and Parts Cleaning Tank
^
Must be clean and free of contamination from engine or other components.
^
Must be clean and filtered if solvent is recirculated.
Safety Equipment
^
Safety glasses and rubber gloves are the minimum requirements to ensure personal safety.
CLEANING PROCEDURES
Tools Required
-
Appropriate Service Manual
-
Awl
-
Micro fine laping compound
-
Tapered #49 drill bit
-
Pencil type magnet
-
Small flat blade screwdriver
-
Small non-abrasive parts cleaning brush
Cleaning and Disassembly
1.
Remove the control valve assembly from the transmission following the procedures contained in the appropriate Service Manual.
2.
Inspect the attaching bolts and bolt holes. Remove metal chips or foreign material that may be present.
3.
Place the control valve assem;bly in a clean tank and with clean solvent thoroughly wash the entire outer surfaces of the valve body.
4.
Remove the control valve assembly from the solvent and dry it using compressed air.
