II - Valve & Pinion Assembly Information
II VALVE & PINION ASSEMBLY OR LOWER SEAL REPLACEMENTThe following procedures should be followed when valve and pinion assembly, valve body rings, or lower pinion seal replacement is required.
Loosening of the rack bearing (yoke) adjuster will allow easier removal and installation of the valve and pinion assembly by relieving the spring pressure on the rack. Be sure to properly adjust the rack bearing (yoke) after installing the valve and pinion. Refer to service manual for proper adjustment specifications.
A. Perform pinion stub shaft seal removal operations as shown in this bulletin.
B. After the stub shaft seals have been removed, carefully push in the valve and pinion until it is firmly seated in the housing.
C. Position the front wheels in the straight ahead position.
D. Mark location of stub shaft flat (master spline) on the pinion housing. This must be done for line-up purposes when reinstalling pinion.
E. Pull valve and pinion assembly out (puller may be required) until the spiral motion stops. At that point, mark the pinion housing in line with the stub shaft flat (master spline). Remove valve and pinion from housing.
CAUTION: I. COVER THE VALVE AND PINION HOUSING TO PREVENT CONTAMINANTS FROM ENTERING HOUSING WHILE PINION IS REMOVED.
II. DO NOT MOVE THE FRONT WHEELS FROM THEIR STRAIGHT AHEAD POSITION PERFORMED IN STEP IIC.
IIA THE FOLLOWING INSTRUCTIONS ARE FOR THE SAGINAW ASSEMBLY:
A. Remove valve body rings.
B. For ease in installing the rings, place them in hot water (150~F to 200~F) for approximately 10 to 15 minutes. This will increase the ring size.
CAUTION: DO NOT USE TRW ASSEMBLY SEAL EXPANDING TOOL C-4791 OR DAMAGE TO THE SEALS WILL OCCUR AFFECTING THE SEALING CAPABILITY.
C. Install the rings into the valve body grooves. Stretch the rings only enough to slide them over the valve.
CAUTION: DO NOT CUT SEALS WHEN INSTALLING.
FIGURE 9 - SEAL RING RESIZING & PROTECTOR SEAL (TRW & SAGINAW):
D. Lubricate the valve and pinion rings with power steering fluid and place the assembly into Tool C- 4790 (Figure 9) and allow to set for 10 to 15 minutes before installing into housing. This will insure proper resizing of the rings.
FIGURE 12 - NO CALL OUT REQUIRED:
E. If the pinion lower seal requires replacement, remove the lower seal using Tool C-4694 (Figure 12). Install the tool into the housing only deep enough to spread the puller into the lower side of the seal lip. If the puller is installed too deep it will not retain the seal for easy removal.
F. Remove upper pinion (plastic) bushing with screwdriver or wire. It will slide out the top easily.
FIGURE 13 - INSTALL LOWER SEAL:
G. Install new bushing and seal using Special Tool L- 4597 (Figure 13). Seat the seal in housing with seal lip facing up.
FIGURE 10 - SEALING RING RESIZING AND PROTECTOR TOOL INSTALLED OVER VALVE:
FIGURE 11 - NO CALL OUT REQUIRED:
H. Lubricate the pinion housing and carefully install the valve and pinion assembly (Figure 10). Tool C-4790 should remain on the assembly when installing (Figure 11) to prevent damage to the sealing rings. While installing the pinion, be sure to line up the marks previously made on the housing with the flat on the stub shaft.
CAUTION: USE EXTREME CARE TO NOT DAMAGE LOWER SEAL.
I. Install remaining pinion parts as outlined in Steps "J" through "P" under "Pinion Stub Shaft Seals" in this bulletin.
IIB THE FOLLOWING INSTRUCTIONS ARE FOR THE TRW ASSEMBLY
FIGURE 14 - INSTALL SEALING RINGS ON VALVE (TRW):
A. Remove valve body rings.
B. Lubricate sealing rings and Special Tool C-4791 with power steering fluid (Figure 14). Carefully slide the rings onto Tool C-4791 (Figure 14). This will expand the rings for proper installation onto the valve assembly.
CAUTION: DO NOT USE HOT WATER ON SEALING RINGS ON TRW ASSEMBLY. They are made of different MATERIAL AND WILL BE DAMAGED, AFFECTING THE SEALING CAPABILITY.
C. Install the ring expander tool over the valve and slide each ring off of the tool into the proper ring grooves (Figure 14).
FIGURE 9 - SEAL RING RESIZING & PROTECTOR SEAL (TRW & SAGINAW):
FIGURE 10 - SEALING RING RESIZING AND PROTECTOR TOOL INSTALLED OVER VALVE:
D. Lubricate Special Tool C-4789 (Figure 9) with power steering fluid and insert the valve and pinion assembly into the tool (Figure 10). This will resize the sealing rings to the proper size.
FIGURE 12 - NO CALL OUT REQUIRED:
E. If the pinion lower seal requires replacement, remove the lower seal using Special Tool C-4694 (Figure 12).
FIGURE 13 - INSTALL LOWER SEAL:
F. Install new seal using special Tool C-4664 (Figure 13).
FIGURE 10 - SEALING RING RESIZING AND PROTECTOR TOOL INSTALLED OVER VALVE:
FIGURE 11 - NO CALL OUT REQUIRED:
G. Lubricate the pinion housing with power steering fluid and install the valve and pinion assembly (Figure 10). Tool C-4789 should remain on the assembly and used as a seal protector when installing the assembly into the housing (Figure 11). While installing the valve and pinion assembly, be sure to line up the marks previously made on the housing with the flat on the stub shaft.
CAUTION: USE EXTREME CARE TO NOT DAMAGE LOWER SEAL.
H. Install the remaining pinion parts as outlined in Steps "J" through "P" under "Pinion Stub Shaft Seals" in this bulletin.
CAUTION: AFTER INSTALLING VALVE AND PINION ASSEMBLY, BE SURE THE FRONT WHEELS ARE IN THE STRAIGHT AHEAD POSITION AND THE FLAT ON THE STUB SHAFT IS PROPERLY ALIGNED WITH THE LOCATING MARKS ON THE HOUSING. THIS WILL INSURE PROPER STEERING WHEEL ALIGNMENT. IF THE STEERING WHEEL IS OFF CENTER, THE PINION WAS MIS-INDEXED DURING INSTALLATION.
POLICY: Reimbursable within the provisions of the warranty
TIME ALLOWANCE: Refer to Labor Operation Time Schedules, 1981-1982-1983 Passenger Car.