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TM 10-4320-342-24
3-20. PUMP AND CLUTCH (200 GPM FUEL PUMP) REPAIR - continued.
(12)
Verify gap by measuring from surface of clutch rotor set (2) to edge of field clutch (4). Subtract dimension J from
this measurement. The difference must equal 0.045 to 0.055. If not, disassemble and add or subtract thickness
of shims per step (8) above.
(13)
If required, tighten nut (8) until key (9) lines up with slot in nut (8) and bend key.
Refer to Figure 3-25.
(14)
Use formula N - O + P - Q = R to determine thickness of shim stack number three (1).
(a)
Measure shaft (2) to determine dimension N.
(b)
Measure bearing carrier (3) to determine dimension O. Subtract from dimension N.
(c)
Measure depth of bearing housing in carrier (3) to determine dimension P. Add dimension P.
(d)
Dimension Q is constant. Q = 0.468.
(e)
Dimension R is the required thickness of shim stack number three (1) based on the above.
(f)
Example of formula: 1.805 - 1.895 + .598 - .468 = 0.040
(15)
Select shim stack number three (1).
NOTE
One or more shims may be used to obtain dimension R above. Shims are made up
of laminated layers and thickness of each layer is 0.002.
(a)
Select appropriate number of shims (1) to obtain dimension R above.
(b)
If necessary, peel appropriate number of laminated layers (4) from shim to achieve dimension R above.
(16)
Install shim stack number three (1) and bearing (5) in bearing carrier (3).
(17)
Position retaining ring (6) on bearing carrier (3) and secure with screws (7).
3-60
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