Chevrolet 1977 10 Series, Repair Manual, Page: 303 / 468

AUTOMATIC TRANSMISSION
(350)7A-19
NOTE:
Forw ard clutch oil seal rings are teflon on JA
and JH models.
6. Remove pum p cover to direct clutch drum housing
selective thrust washer (fig. 7A-61B).
NOTE:
A needle bearing is used on C series Truck
instead of a thrust washer.
7. Remove pum p cover and stator shaft assembly from
pum p body (fig. 7A-62B).
8. Remove pum p drive gear and driven gear.
9. Remove pum p outside diam eter to case (square cut)
"O" ring seal. Discard seal.
Inspection
1. W ash all parts in cleaning solvent and blow out all
oil passages. DO N O T USE RA G S TO D RY PARTS.
CAUTION:
Some solvents may be harmful to
rubber seals.
2. Inspect pump gears for nicks or damage.
3. Inspect body and cover faces for nicks or scoring.
Inspect cover hub O.D. for nicks or burrs which might
damage clutch drum bushing journal.
4. Inspect body bushing for galling or scoring. Check
clearance between body bushing and converter pum p hub.
M axim um clearance is .005". If the bushing is damaged, the
oil pum p body should be replaced.
Fig. 7 A - 6 3 B ~ C h e c k in g Pu m p B o d y to Gear Face C le a ran ce
5. Inspect converter housing hub O.D. for nicks or burrs
which might damage pum p seal or bushing. R epair or replace
as necessary.
6. If hub lip seal is damaged or is leaking (and the pump
body is otherwise suitable for reuse), replace seal.
7. W ith parts clean and dry, install pum p gears in pump
body and check pum p body face to gear face clearance.
Clearance should be .0005"-.0015" (fig. 7A-63B).
Reassembly
1. Replace hub lip seal if defective (figs. 7A-64B and
7A-65B).
2. Place pum p body on wood blocks and pry out
defective seal. Coat outer diam eter of new seal with a non­
hardening sealer and install seal using seal installer J-2 1359
to seat seal fully in counterbore.
PUMP C O V E R A N D
S T A T O R S H A F T
A S S E M B L Y
PUMP B O D Y
PUMP TO CONVERTER
HUB LIP SEAL
PUMP BODY
SCREWDRP
W O O D BLOCKS
Fig. 7A-62B~Separating Pump Cover From Pump Body Fig. 7A-6 4B-R em ovin g Pump to Converter Hub Lip Seal