W 250 Pickup L6-359 5.9L DSL (1989)
Compressor HVAC: Technical Service Bulletins
A/C Compressor - Revised Parts
Models
All With C-171 Compressor
Subject
Air Conditioning Compressor End Covers/Valve Plates
Index
AIR CONDITIONING
Date
January 30, 1989
No.
24-01-89
P-260 (C24-06)
SYMPTOM/CONDITION
Service replacement air conditioning compressor valve plates and end covers.
DIAGNOSIS
To improve the quality of the C-171 air conditioning compressor, some running changes were made during the 1988 model year. These changes include
new style thin valve plates which improves compressor efficiency and the elimination of the low silicon rear end covers which will reduce through-bolt
leakage. The new covers and valve plates must be replaced as a set when servicing this portion of the compressor.
The new thin valve plates require new end covers, and therefore these new valve plates cannot be used with old style end covers.
The low silicon rear end covers do not have the sealing ability of the high silicon rear end covers and therefore should not be used for any service
repairs.
PARTS REQUIRED
To prevent confusion and to make the repair procedure easier, two new service replacement high silicon end cover/valve plate kits have been made
available which can be used to service all end covers and valve plates for all model years.
NOTE:
WHEN SERVICING EITHER VALVE PLATES OR COVERS, BOTH MUST BE REPLACED. DO NOT MIX OLD COVERS AND
OLD VALVE PLATES WITH THE NEW ONES IN THE KITS LISTED BELOW.
Front End Cover/Valve Plate Kit, PN 4494333
Consists of:
New Front Cover
PN 3849975
New Front Valve Plate
PN 3849970
Gaskets
PN 3846698
Instruction Sheet
PN K6852840
Rear End Cover/Valve Plate Kit PN 4494334
Consists of:
New Rear Cover
PN 3849968
New Rear Valve Plate
PN 3849972
Gaskets
PN 3846698
Instruction Sheet
PN K6852840
These high silicon end cover/valve plates are available only as a kit. They will not be available as separate pieces from service parts.
