3c351ee6

9.11. Main shaft of the BF DOHC transmission

Main shaft of the BF DOHC transmission

1 – bearing;
2 – gear wheel of the 4th transfer;
3 – ring of the synchronizer of the 4th transfer;
4 – lock ring;
5 – synchronizer 3-ey/of the 4th transfer;
6 – ring of the synchronizer of the 3rd transfer;
7 – needle bearing;
8 – gear wheel of the 3rd transfer;
9 – bearing;
10 – main shaft;
11 – synchronizer spring;
12 – the sliding synchronizer coupling;
13 – clamp cracker;
14 – synchronizer coupling nave

Preliminary check

GAP OF THE GEAR WHEEL OF THE 3RD TRANSFER
PERFORMANCE ORDER

1. Measure a gap between a gear wheel of the 3rd transfer and a gear wheel 2-it transfers.

Nominal gap: 0,06–0,21 mm
Maximum permissible gap: 0,26 mm

2. If the gap exceeds maximum permissible value, check the surface of contact of a gear wheel of the 3rd transfer, a gear wheel of the 2nd transfer and a nave of the coupling of the synchronizer 2-oy/of the 3rd of transfers. Replace the worn-out or damaged details.

GAP OF THE GEAR WHEEL OF THE 4TH TRANSFER

PERFORMANCE ORDER

1. Measure a gap between a gear wheel of the 4th transfer and the bearing.

Nominal gap: 0,1–0,37 mm
Maximum permissible gap: 0,57 mm

2. If the gap exceeds maximum permissible value, check the surface of contact of a gear wheel, the bearing and coupling of the synchronizer 3-ey/of the 4th of transfers. Replace the worn-out or damaged details.

Dismantling


Prevention

You hold a shaft with one hand so that to exclude its falling.


PERFORMANCE ORDER
1. By means of a press and special OK130 175 008 adaptation remove the bearing from a shaft.
2. Remove a gear wheel of the 4th transfer
3. Remove a lock ring.
4. Remove the coupling of the synchronizer 3-ey/of the 4th of transfers, a ring of the synchronizer of the 3rd transfer and a gear wheel of the 3rd transfer.
5. A stripper of OK670 990 AA0, remove the bearing from a main shaft.

Check

SYNCHRONIZER RING

PERFORMANCE ORDER
1. Visually check a condition of teeths of a ring of the synchronizer for absence of damage, wear and cracks.
2. Check a condition of a conic surface for absence of damage, wear and cracks.

Prevention

Establish a synchronizer ring in a gear wheel, and measure a gap between a ring of the synchronizer and a surface of a flange of a gear wheel.


3. To measure a gap between a ring of the synchronizer and a surface of a flange of a gear wheel.

Nominal gap: 1,1–1,4 mm
Minimum admissible gap: 0,8 mm

MAIN SHAFT


Prevention

If replacement of a gear wheel of a main shaft was made, adjust a preliminary tightness of the bearing.


PERFORMANCE ORDER
1. Check a beating of a seat of gear wheels of a main shaft.

Maximum permissible beating: 0,1 mm

2. Check a condition of shlits of a main shaft.
3. Check a condition of a surface of teeths of gear wheels for absence of damage, wear and cracks.

GEAR WHEELS OF THE 3RD, 4TH, 5TH TRANSFERS AND TRANSFER OF THE BACKING

PERFORMANCE ORDER
1. Measure a gap between gear wheels of a shaft and gear wheels.

Element
Gap for lubricant, mm
Shaft And (outer diameter)
34,987 – 34,998
Shaft In (internal diameter)
40,009 – 40,025
The plug About (outer diameter)
30,94 – 30,97
Gear wheel of the 3rd transfer
31,00 – 31,02
Gear wheel of the 4th transfer
34,00 – 34,02
Gear wheel of the 5th transfer
33,94 – 33,97
2. Examine the plug of a gear wheel of the 5th transfer on absence of damage.
3. Examine a condition of a surface of teeths of gear wheels on absence of damage, wear and cracks.

BEARING

PERFORMANCE ORDER
Check the bearing for absence of damage and smoothness rotation.

Assembly

PERFORMANCE ORDER
1. Establish a gear wheel of the 3rd transfer, a ring of the synchronizer and the coupling of the synchronizer.
2. Establish a new lock ring.
3. Establish a gear wheel of the 4th transfer.
4. Using a press, install the bearing.

Check

PERFORMANCE ORDER

1. Measure a gap between a gear wheel of the 3rd transfer and a gear wheel 2-it transfers.

Nominal gap: 0,06–0,21 mm
Maximum permissible gap: 0,26 mm

2. Measure a gap between a gear wheel of the 4th transfer and the bearing.

Nominal gap: 0,1–0,37 mm
Maximum permissible gap: 0,57 mm

3. If the gap differs from the required value, sort and repeatedly collect a main shaft of the transmission.