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Nissan Micra Manual Transaxle Mainshaft & Diff Side Bearing Preload - MT-22

Manual transaxle mainshaft and diff side bearing preload adjustment; final drive turning torque 1.5-3.4 N-m, total overall 2.9-7.4 N-m (new bearing).

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This is page MT-22 of a factory service manual covering the manual transaxle, specifically the mainshaft and differential side bearing preload adjustment procedure. It describes step 10 of a shim selection procedure: verifying correct shim thickness by measuring turning torque of the final drive alone and total turning torque after full assembly. The procedure directs inserting differential side bearing adjusting shim(s) into the transmission case, installing the final drive assembly to the clutch housing, tightening the transmission case bolts, and measuring turning torque using special tool KV38106100 (shown in illustration SMT962). Specifications given: final drive turning torque with a new bearing is 1.5-3.4 N·m (15-35 kg-cm, 13-30 in-lb); total turning torque overall is 2.9-7.4 N·m (30-75 kg-cm, 26-65 in-lb), and compared with the final drive only, 1.5-3.9 N·m (15-40 kg-cm, 13-35 in-lb). Two cautions note that when old bearings are reused, preload will be slightly lower than the indicated values, and preload should be checked to confirm it is not far from the specified range. The page belongs to a larger multi-page manual set uploaded for a 1990 Nissan Micra.

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Frequently asked questions

What is the final drive turning torque specification with a new bearing?
1.5 - 3.4 N·m (15 - 35 kg-cm, 13 - 30 in-lb).
What is the total turning torque specification after all component parts are assembled?
Overall: 2.9 - 7.4 N·m (30 - 75 kg-cm, 26 - 65 in-lb); compared with final drive only: 1.5 - 3.9 N·m (15 - 40 kg-cm, 13 - 35 in-lb).
What special tool is shown for measuring turning torque?
Tool KV38106100, shown attached to the clutch housing in illustration SMT962.
What happens to preload when an old bearing is reused?
Preload will be slightly lower than the indicated values; check preload to see if it is not far from the specified range.
How do you verify the correct differential side bearing shim thickness?
Insert the adjusting shim(s) into the transmission case, install the final drive assembly to the clutch housing, tighten the transmission case bolts, then measure turning torque of the final drive only and the total turning torque after full assembly.

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