88 Custom Cruiser V8-307 5.0L VIN Y 4-bbl (1982)
FIGURE 2
2.
Selecting the Pump Rotor and Slide
A.
Use a micrometer to measure the original pump rotor and slide thickness accurately (Figure 2). To obtain the most accurate reading, measure
on flat undamaged surfaces.
B.
Using the original part measurement, order replacement parts according to the following selective charts:
THM 200-4R SELECTIVE PUMP ROTOR
Part No.
Thickness In mm
Thickness In Inches
8634091
17.948 - 17.961
0.7066 - 0.7071
8634092
17.961 - 17.974
0.7071 - 0.7076
8634093
17.974 - 17.987
0.7076 - 0.7081
8634094
17.987 - 18.000
0.7081 - 0.7086
8634095
18.000 - 18.013
0.7086 - 0.7091
THM 200-4R SELECTIVE PUMP SLIDE
Part No.
Thickness In mm
Thickness In Inches
8634081
17.948 - 17.961
0.7066 - 0.7071
8634082
17.961 - 17.974
0.7071 - 0.7076
8634083
17.974 - 17.987
0.7076 - 0.7081
8634084
17.987 - 18.000
0.7081 - 0.7086
8634085
18.000 - 18.013
0.7086 - 0.7091
NOTE:
The replacement part will provide the same clearance that the oil pump assembly was originally built with. The proper end clearance
specification is 0.020 mm to 0.050 mm (.0008" to .002").
C.
Hone both sides of the replacement rotor and slide to remove any burrs, and measure the replacement parts with a micrometer to assure proper
selection.
NOTE:
Incorrect rotor selection could result in a damaged oil pump assembly and/or low oil pressure. Incorrect slide selection could result in incorrect
line pressure.
3.
Assembly
A.
Reassemble the oil pump assembly following procedures outlined in the service manual.
B.
After assembling the oil pump onto the transmission, install the converter and check for proper rotor and slide clearance by turning the
converter. The converter should turn freely. If the converter does not turn freely, recheck the pump rotor and slide selection.
C.
Install the transmission into the vehicle.
