M/T Mainshaft Inspection

1.Inspect the oil passage, gear, and bearing surfaces for wear and damage, then measure the mainshaft at points A, B, C, D, E, and F. If any part of the mainshaft is less than the service limit, replace it.

Standard:
A Ball bearing surface (transmission housing side): 
 30.987-31.000 mm (1.2200-1.2205 in.) 
B 6th gear distance collar surface: 
 32.987-33.000 mm (1.2987-1.2992 in.) 
C 4th/5th gear distance collar surface: 
 35.987-36.000 mm (1.4168-1.4173 in.) 
D Needle bearing surface: 
 41.984-42.000 mm (1.6529-1.6535 in.) 
E Ball bearing surface (clutch housing side): 
 28.002-28.015 mm (1.1024-1.1030 in.) 
F Pilot bearing surface: 
 19.967-19.980 mm (0.7861-0.7866 in.) 

Service Limit:
A: 30.93 mm (1.218 in.) 
B: 32.93 mm (1.296 in.) 
C: 35.93 mm (1.415 in.) 
D: 41.93 mm (1.651 in.) 
E: 27.95 mm (1.100 in.) 
F: 19.91 mm (0.784 in.) 

 

2.Inspect the runout by supporting both ends of the mainshaft. Then rotate the mainshaft two complete turns while measuring with a dial gauge. If the runout is more than the service limit, replace the mainshaft.

Standard: 0.02 mm (0.001 in.) 
Service Limit: 0.05 mm (0.002 in.)