REPAIR INSTRUCTIONS 25. For the No. 3 (lower) and No. 1 (upper left) countershaft, measured end play determines the thickness of shims that must be removed from the shim pack to obtain zero end play. Then remove additional shim thickness to obtain the required 0.003 to 0.007 inch preload. Example: a.
Begin the procedure, using enough shims under the cover to produce measurable end play.
b.
Measure countershaft end play. For this example, end play is 0.100 inch.
c.
Remove 0.100-inch shims from the shim pack to obtain zero end play.
d.
Remove (subtract) additional 0.003 to 0.007 inch shims from the pack to obtain the specified preload.
e.
27. Install the No. 3 (lower) and No. 1 (upper left) front countershaft rear bearing covers by aligning and lightly tapping the covers in place. Install the capscrews and tighten to the specified torque.
Do not use the bearing cover capscrews to pull any bearing cover into place. Damage to the bearings or bearing cover may result. Make sure all components are properly in place before tightening the capscrews. 28. Working through the opening at the rear of the case, install the reverse speed gear mainshaft snap ring onto the shaft, if not already done. Install into fifth groove from rear of shaft. 529
Total shim thickness removed from the shim pack to obtain 0.003 to 0.007 inch preload must be 0.103 to 0.107 inch.
Preload is “negative end play” or “crush.” It cannot be measured directly. Determining shim thickness must be done carefully, as described, to obtain the correct preload on the bearings. 26. After determining the correct shim thickness, install the shim pack onto the No. 3 and No. 1 front countershaft rear covers. 528
Figure 528 — Installing Shim Pack
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Figure 529 — Installing Reverse Gear Mainshaft Snap Ring (T313L/T318L Shown)
