GMC T Series 1994 Repair Manual page 662

From the pump pocket:
• Pump guide rings (210)
• Pump vanes (213)
• Pump rotor (212)
• Pump guide (211)
e Slide (209)
• Slide seal (201)
• Seal support (208)
• Pivot slide pin (205) and spring (204)
• Slide seal ring (201) and slide back up seal
(202)
Retainer (94), oil seal assembly (2).
3.
• Pry out with a screwdriver.
Oil Pump Cover
Figures 90,91 and 94
Tool Required:
One inch micrometer
S 5I Disassemble
Figures 91 and 94
Converter clutch apply valve train.
1.
A. Compress converter clutch stop valve (223)
with a screwdriver.
B. Remove retaining ring (222).
C. Slowly release the spring tension.
D. Stop valve (223), converter clutch apply
valve (224) and two converter clutch valve
springs.
2 Pressure relief ball (228).
.
• Ball is under strong spring pressure.
• Cover the ball with a cloth when removed.
3. Pressure regulator assembly (216-221).
• Follow the same procedure used to remove
the converter clutch valve.
Inspect
Figure 91
• Pressure regulator valve assembly (216-221) and
converter clutch apply valve assembly (222-
226) for:
- Chips, burrs, distortion, plugged oil passage
and free movement in bore.
- Remove burrs with lapping compound.
• Pressure relief assembly (227-229) for damage
or distortion.
Pump cover (215) and pump body (200) for:
- Worn or damaged bushings (see Bushing
Replacement Procedure).
- Foreign material or debris.
- Porosity.
- Scored or irregular mating faces.
- Cross channel leaks.
- Ring groove damage.
Rotor (212) and slide (203) for cracks.
Oil seal assembly for damage or wear.
Clean
Wash and air dry all parts.
| 9 | Important
• Do not wipe dry with a cloth.
OIL PUMP ROTOR SELECTION CHART
THICKNESS (mm)
17.948- 17.961
17.961 - 17.974
17.974- 17.987
17.987 - 18.000
18.000 - 18.013
OIL PUMP SLIDE SELECTION CHART
THICKNESS (mm)
17.948 - 17.961
17.961 - 17.974
17.974- 17.987
17.987 - 18.000
18.000 - 18.013
212
203 SLIDE, PUMP
212 ROTOR, OIL PUMP
THICKNESS (in.)
0.7066 - 0.7071
0.7071 - 0.7076
0.7076 - 0.7081
0.7081 - 0.7086
0.7086 - 0.7091
THICKNESS (in.)
0.7066 - 0.7071
0.7071 - 0.7076
0.7076 - 0.7081
0.7081 - 0.7086
0.7086 - 0.7091
R H 0 1 8 4 -4 L 6 0 -E