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AUTOMATIC TRANSMI SSION AND DIFFERENTIAL
(w7BO) 3- 2
7 . Oil Pump Assembly
A: DISASSEMBLY
1) Remove the oil seal retainer .
Also remove the O-ring and oil seal (air breather) .
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2) Remove the oil pump cover .
Lightly tap the end of the stator shaft to remove the
cover.
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3) Remove the retainer and return spring . Then remove
the rotor, two vane rings and nine vanes.
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4) Remove the cam ring and control piston .
Also remove the O-ring, friction ring, two side seals, and
plain seal .
/-fig . 233
5) Remove two seal rings (R) and two seal rings (H) .
B : INSPECTION
1) Make sure that each component is free of harmful
gouges, cuts, and dust .
2) Selection of oil pump components (rotor, vanes,
control piston and cam ring) :
(1) Using a micrometer, measure the height of the
rotor, vanes, control piston and cam ring in at least
four positions . (Measure the height at one place for
each of the nine vanes .)
a. Remove the control piston seals when measuring.
b. Remove the friction ring from the cam ring when
measuring.
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Troubleshooting
