Note: Be very careful not to split evenly for reasons that represent no more than a minor inconvenience. "noisy" boxes or boxes whose synchronizers fail when shifting quickly can still last quite a long time in this state. To eliminate noise, a worn box usually has to be completely sorted out, because. when installing together old and new parts, the noise will still not disappear. Therefore, the decision to rebuild the box should be taken with great care.
Gearbox makes noise in neutral
1. When the box is in neutral position and the engine is running, the drive shaft and 4 gears rotate in the box. All of them rotate on ordinary bushings, with the exception of one of the ends of the drive shaft (from the casing of the gas distribution mechanism), which rotates in a ball bearing. Noise can be caused by excessive wear on gear teeth or bushings/ball bearings, as well as worn circlips and cup washers. Inspect all of the above parts and replace as necessary.
Gearbox makes noise in gear
2. When the box is in gear, in addition to the above parts, the output shaft, its two ball bearings and one roller bearing, differential and (when driving in reverse) reverse gear. Inspect all parts listed in paragraphs 1 and 2 and find and eliminate the cause of the noise.
The gearbox makes noise only in one of the gears
3. Gear box noise in one particular gear can be caused by any of the above reasons, however, during inspection, special attention should be paid to those gears or gear blocks that relate to this gear.
Knocks out the gear when accelerating or braking the engine
4. This is usually caused by wear on the yokes or grooves on the synchronizers, as well as wear on the synchronizer hubs or V-rings, wear on the locking grooves on the rods, or excessive axial movement of the output shaft. In any case, you will have to disassemble the box for inspection.
Poor synchro work
5. Disassemble the box and inspect the synchronizers for excessive wear. Prior to disassembly of the box, gear shifting can be facilitated by double depressing the clutch.
Difficulty shifting gears
- A. damage or misalignment of the gear lever mechanism
- b. lock wear and (or) gear locks
- V. failure of the needle bearing in the drive gear, standing on the crankshaft (see chapter 5)