FIT AND CLEARANCE VALUES O F MAJOR SUB-ASSEMBLIES SR.NO.
DESCRIPTION OF LOCATION THEORETICAL VALUE (IN MM) 1 Clearance of main bearing 0.095 ~ 0.171 2 Clearance of connecting rod bearing 0.059 ~ 0.135 3 Crankshaft axial clearance 0.052 ~ 0.255 4 Crankshaft axial clearance Crankshaft axial clearance 5 Clearance between connecting rod small end bush and piston pin 0.045 ~ 0.061 6 Clearance between piston pin seat and piston pin 0.005 ~ 0.018 7 Butt clearance of piston rings- cold state (in special die) First ring 0.4~ 0.6 Second ring 0.3 ~ 0.55 Scraper ring 0.35 ~ 0.55 8 Piston ring cold State end face clearance First ring Second ring 0.07 ~ 0.115 Scraper ring 0.04 ~ 0.075 9 Clearance between intake valve stem and guide 0.02 ~ 0.048 10 Clearance between exhaust valve stem and guide 0.025 ~ 0.053 11 Value of valve head top recessed in cylinder head plane exhaust/inlet 1.08 ~ 1.48/0.85 ~ 1.05 12 Value of valve head top above cylinder block upper plane 0.05 ~ 0.10 13 Camshaft axial clearance 0.1 ~ 0.4 14 Camshaft bearing clearance 0.04 ~ 0.12 15 Clearance between tappet and tappet housing 0.025 ~ 0.089 Table 4.2 Never operate the engine with very low or very high oil level CAUTION 4.4.4 Monitoring the engine coolant Maintain the correct coolant level in the expansion tank.
Coolant is the media to maintain engine body temperature within the specified range (75°C to 95°C). Maintaining engine body temperature in the required range will ensure proper fit & clearance between the moving parts. 22 22