Cause of malfunction | Remedy |
Noise in gearbox | |
Wear of gear teeth in the gearbox Bearing wear Insufficient oil level in the gearbox | Replace worn parts Replace worn bearings Add oil to the gearbox. If necessary, replace damaged or worn oil seals in the gearbox |
Difficulty shifting gears | |
Incomplete clutch disengagement Deformation of the drive rod of the gearshift control mechanism or jet thrust Loose screws securing the hinge or gear selector lever Incorrect adjustment of the gear shift actuator Wear or breakage of plastic parts in the gearbox control drive | Cm. «Clutch» Straighten or replace gearshift control linkages Tighten the screws (see «Disassembly and assembly of the gearbox and troubleshooting of its parts») Adjust the transmission control actuator Replace damaged parts in the gearbox control actuator |
Spontaneous disengagement of gears | |
Damage or wear to the ends of the synchronizer teeth on the gear and clutch in the gearbox Increased vibrations of the power unit on the supports due to cracks or delamination of rubber on the rear supports Lack of shifting due to incorrect adjustment of the gearbox control drive | Replace worn and damaged parts in the gearbox Replace damaged powertrain parts Adjust the transmission control actuator (see «Gearbox control drive adjustment») |
Noise (crackling) at the moment of switching gears | |
Incomplete clutch disengagement Deterioration of the blocking ring of the synchronizer of the switched gear | Cm. «Clutch» Replace the gear synchronizer blocking ring |
Oil leak from gearbox | |
Wear on the gearbox input shaft seals, constant velocity joint housings, gear selector rod or speedometer drive shaft seal Loose crankcase or transmission cover or damaged sealant under transmission cover or between transmission housing and clutch housing, loose drain plug | Replace oil seals, seal in gearbox Change the sealant, tighten the bolts and nuts, tighten the drain plug on the gearbox |