K 3500 Truck 4WD V8-454 7.4L (1994)
seal. Make sure that the Seal Seat and Seal Lip are free of lint and dirt that could damage the seal surface or prevent sealing.
On-Vehicle
Install or Connect
1. Dip the new seal O-ring in clean 525 viscosity refrigerant oil and assemble onto O-ring Installer J 33011.
2. Insert the O-ring Installer J 33011 completely down into the compressor neck until the Installer "bottoms". Lower the moveable slide of the O-ring
Installer to release the O-ring into the seal seat O-ring lower groove. (The compressor neck top groove is for the shaft seal retainer ring.) Rotate
the Installer to seat the O-ring and remove the Installer.
3. Prepare Lip Seal:
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Assemble Lip Seal to Seal Installer, J 23128-A. The printed/stamped steel case side of Lip Seal must be engaged with knurled tangs of installer
so that flared-out side of Lip Seal is facing and installed towards the compressor.
4. Install Lip Seal:
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Place Seal Protector J 34614 over end of compressor shaft and slide new seal onto the shaft until it stops. Disengage installer from seal and
remove seal protector from compressor shaft.
NOTICE: Handling and care of seal protector is important. If seal protector is nicked or the bottom flared, the new seal may be damaged during
installation.
Removing And Installing Shaft Seal Seat Retaining Ring
5. Install the new seal seat retainer ring with its flat side against the Seal Seat, using Snap-Ring Pliers J 5403. Use the sleeve from O-ring Installer J
33011 to press in on the seal seat retainer ring so that it snaps into its groove.
6. Evacuate and charge system with 1 lb. refrigerant. Temporarily install the shaft nut and, with the compressor in horizontal position, rotate the
compressor shaft in normal direction of rotation several times. Leak test the seal. Recover refrigerant and repair as necessary. Remove, discard and
later replace the shaft nut.
7. Remove any excess oil, resulting from installing the new seal parts, from the shaft and inside the compressor neck.
8. Install the Clutch Plate and Hub assembly as described in minor repair procedures.
9. Reinstall compressor belt and tighten Bracketry.
10. Evacuate and Charge the Refrigerant System.
Off-Vehicle
Install or Connect
1. Follow applicable on-vehicle procedures.
2. To leak test. install compressor leak test fixture J 9625-A on rear head of compressor and connect gage charging lines and J 38100-B Refrigerant
Recovery System. Pressurize suction and high-side of compressor with Refrigerant-12 vapor to drum pressure. Temporarily install (M9 x 1.25
thread on shaft) nut and, with the compressor in horizontal position, rotate the compressor shaft in normal direction of rotation several turns by
hand. Leak test the seal area and correct any leak found. Recover the refrigerant. Remove shaft nut.
