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Home >> Nissan-Datsun >> 2010 >> Sentra L4-2.0L (MR20DE) >> Repair and Diagnosis >> Transmission and Drivetrain >> Manual Transmission/Transaxle >> Service and Repair >> Overhaul >> Mainshaft And Gears

Mainshaft And Gears





MAINSHAFT AND GEARS


Disassembly and Assembly


GENERAL PRECAUTIONS
- Do not reuse snap rings.
- Position mainshaft on the vise with back plate and remove gears and snap rings.





- For installation and removal of snap ring, position snap ring pliers and flat pliers at both sides of snap ring. Stretch snap ring, and move it with flat pliers.
- Disassemble gear components putting matching marks on the parts that do not affect any functions.

DISASSEMBLY





1. Remove snap ring (1).





2. Install Tool (A) and suitable tool onto 6th main gear (1), and remove mainshaft rear bearing inner race (2) and 6th main gear
(1) from mainshaft.

Tool number A: ST33052000 ( - )






3. Install Tool (A) and suitable tool onto 4th main gear (1), and remove 5th main gear (2), and 4th main gear (1) from mainshaft.

Tool number A: ST33052000 ( - )

4. Remove intermediate adjusting shim.





5. Install Tool (A) and suitable tool onto 1st main gear (1), and remove 1st main gear (1), 1st-2nd synchronizer assembly (2), 2nd main gear (3), bushing, and 3rd main gear (4) from mainshaft.

Tool number A: ST33052000 ( - )






6. Install Tool (A) and suitable tool onto mainshaft front bearing inner race (1), and remove mainshaft front bearing inner race (1) from mainshaft.

Tool number A: ST33052000 ( - )


INSPECTION AFTER DISASSEMBLY

Mainshaft and Gears





Check items below. If necessary, replace them with new ones.
- Damage, peeling, dent, uneven wear, bending, and other nonstandard conditions of the shaft.
- Excessive wear, damage, peeling, and other non-standard conditions of the gears.

Synchronizer





Check items below. If necessary, replace them with new ones.
- Damage and excessive wear of contact surfaces of coupling sleeve, synchronizer hub, insert key.
- Coupling sleeve and synchronizer hub must move smoothly.





- If any crack, damage, or excessive wear is found on cam face of baulk ring or working face of insert, replace it.

Bearing





Check bearing for damage and unsmooth rotation. Replace if necessary.

CAUTION:
- Replace mainshaft front bearing outer race and mainshaft front bearing inner race as a set.
- Replace mainshaft rear bearing inner race and mainshaft rear bearing outer race as a set.

ASSEMBLY





1. Install mainshaft front bearing inner race (1), using Tool (A).

Tool number : ST36720030 ( - )


CAUTION:
Replace mainshaft front bearing outer race and mainshaft front bearing inner race as a set.
2. Apply gear oil to 1st inner baulk ring, 1st synchronizer cone, 1st outer baulk ring, 2nd inner baulk ring, 2nd synchronizer cone, and 2nd outer baulk ring.

CAUTION:
- Replace 1st inner baulk ring, 1st synchronizer cone, and
1st outer baulk ring as a set.
- Replace 2nd inner baulk ring, 2nd synchronizer cone, and 2nd outer baulk ring as a set.
3. Install insert keys and 1st-2nd coupling sleeve to 1st-2nd synchronizer hub.

CAUTION:
Replace 1st-2nd synchronizer hub and 1st-2nd coupling sleeve as a set.





4. Install 1st main gear (1), 1st inner baulk ring, 1st synchronizer cone, 1st outer baulk ring, 1st-2nd synchronizer hub assembly
(2), 2nd inner baulk ring, 2nd synchronizer cone, and 2nd outer baulk ring.
5. Install bushing (3), using Tool (A).

Tool number : ST32102700 ( - )






6. Install 3rd main gear (1) and 2nd main gear (2), using Tool (A).

Tool number : ST32102700 ( - )






7. Measure dimension (L) as shown. Select mainshaft adjusting shim (1) according to the following list, and then install it to mainshaft.















8. Install 4th main gear (1), using Tool (A).

Tool number : ST33052000 ( - )






9. Install 5th main gear (1), using Tool (A).

Tool number : ST33052000 ( - )






10. Install 6th main gear (1), using Tool (A).

Tool number : ST33052000 ( - )






11. Install mainshaft rear bearing inner race (1), using Tool (A).

Tool number : ST30901000 (J_26010-01)


CAUTION:
Replace mainshaft rear bearing inner race and mainshaft rear bearing outer race as a set.
12. Install snap ring.

CAUTION:
Never reuse snap ring.

ASSEMBLY





1. Press-fit the mainshaft front bearing inner race (1) onto the mainshaft using Tool (A).

Tool number A: ST36720030 ( - )






2. Install 1st main gear (1), and 1st-2nd synchronizer assembly (2) onto the mainshaft.
3. Press-fit the bushing (3) onto the mainshaft using Tool (A).

Tool number A: KV32102700 ( - )






4. Press-fit 3rd main gear (1) onto the mainshaft with Tool (A) after installing the 2nd main gear (2) and the 3rd main gear (1) onto the mainshaft.

Tool number A: KV32102700 ( - )






5. Select the thickness of the intermediate adjusting shim (1) needed by measuring the distance (L) between the base of the mainshaft (2) and the top of the 3rd main gear (3). Refer to the following table to determine the thickness of the adjusting shim.






6. Install selected intermediate adjusting shim.





7. Press-fit the 4th main gear (1) onto the mainshaft using Tool (A).

Tool number A: KV32102700 ( - )






8. Press-fit the 5th main gear (1) onto the mainshaft using Tool (A).

Tool number A: KV32102700 ( - )






9. Press-fit the 6th main gear (1) onto the mainshaft using Tool (A).

Tool number A: KV32102700 ( - )






10. Press-fit the mainshaft rear bearing inner race (1) onto the mainshaft using Tool (A).

Tool number A: ST30901000 (J-26010-01)

11. Install snap ring onto mainshaft.
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