3208 INDUSTRIAL ENGINE ATTACHMENTS – Mounting Group For AT540, MT643, and MT653 Allison Transmission

(1) Maximum face runout of flexplate measured at bolt circle diameter … .030 in.(0.76 mm)

(2) Bore runout of spacer T.I.R.

(Total indicator reading)

AT540 … .020 in.(0.51 mm)

MT643, MT653 … .008 in.(0.20 mm)

(3) Face runout of spacer T.I.R.

(Total indicator reading)

AT540 … .020 in.(0.51 mm)

MT643, MT653 … .008 in.(0.20 mm)

(4) Torque for bolts that hold flywheel and adapter to crankshaft … 55 ± 5 lb.ft.(75 ± 7 N·m)

(5) Bore runout of adapter T.I.R.

(Total indicator reading)

AT540 … .010 in.(0.25 mm)

MT643, MT653 … .005 in.(0.13 mm)

(6) Face runout of adapter with flex plate installed [measured 3.00 in. (76.2 mm) from center of bore] (Total indicator reading) … .003 in.(0.08 mm)