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TM 10-4320-342-24
3-20. PUMP AND CLUTCH (200 GPM FUEL PUMP) REPAIR - continued.
(13)
Inspect shaft (8) for cracks, signs of wear, damage, worn keyways or discoloration.
(14)
Inspect all attaching hardware (bolts, nuts and inserts) for stripped threads, cracks or burrs.
(15)
Inspect rotor assembly (30) for wear, glazed friction surfaces and corrosion.
(16)
Inspect field clutch (35) for damaged insulation, exposed windings and damaged terminal studs.
(17)
Replace shim stacks (13, 25, 29, 36 and 44).
c. ASSEMBLY. Refer to Figure 3-23.
(1)
Determine and record the following measurements:
(a)
Measure distance on clutch housing (1) to determine dimension A.
(b)
Measure thickness of bearing (2) to determine dimension B.
(c)
Measure thickness of spacer (3) to determine dimension C.
(d)
Measure thickness of inner lip (4) on clutch housing (1) to determine dimension D. Record for use later
during shimming procedures.
(2)
Use formula: A - (B x 2) - C - E = F to determine thickness of shim stack number one (5).
(a)
Use dimension B measurement from above and multiply by two; then subtract product from dimension A.
(b)
Subtract dimension C.
(c)
Subtract dimension E. Dimension E is a constant. E = 0.050.
(d)
Dimension F is the required thickness of shim stack number one (1) based on the above. Record for use
later during shimming procedures.
(e)
Example of formula: 1.318 - 1.180 (.590 x 2) - .048 - .050 = 0.040
(3)
Select shim stack number one (5).
NOTE
One or more shims may be used to obtain dimension F above. Shims are made up
of laminated layers and thickness of each layer is 0.002.
(a)
Select appropriate number of shims to obtain dimension F above.
3-56
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