17
3–1. CHECKING INPUT COMPONENTS
• Check all bolt holes on the front of the flywheel/converter cover/flexplate
adapter. The threads must be undamaged, and the holes free of chips or
foreign material.
• Check the pilot boss (at center of flywheel) for damage or raised metal that
would prevent free entry into the flexplate hub (adapter).
• Check the starter ring gear for excessive wear or damage. Check welds that
retain the ring gear (where applicable).
• Check the transmission mounting flange for gasket remnants, raised metal,
or dirt.
• Inspect the transmission-to-engine mounting flange for raised metal, burrs,
and pieces of gasket material. Remove any of these defects. Inspect the
threaded holes for damaged threads.
3–2. CHECKING TORQUE CONVERTER POSITION
When the transmission is installed, the torque converter is axially positioned by the
flexplate. When properly positioned, the torque converter assembly is free of all
restraints against fore and aft movement except for that of the flexplate.
• To determine that there will be ample clearance for positioning the torque
converter, measure as indicated in Figure 3–1. Check the results against the
following dimensions.
— AT 500 and AT 500N Series models with converter build date stamp
before 9/84: 1.600–1.740 inches (40.64–44.19 mm)
— AT 500, AT 500R, and AT 500N Series models with converter build date
stamp of 9/84 or later: 1.581–1.741 inches (40.16–44.22 mm)
— AT 543 models: 1.600–1.721 inches (40.64–43.71 mm)
— AT 1500 Series models: 2.715–2.875 inches (68.96–73.03 mm)
• A measurement outside these dimensions indicates the torque converter is not
installed properly. (Refer to the applicable Allison Transmission Service
Manual. Refer to Paragraph 7–2.)
PREPARING
TRANSMISSION FOR
INSTALLATION
SECTION
III
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