Operating Instructions
22
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
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 specied range (75°C to 95°C).
Maintaining engine body temperature in the required range will ensure proper t &
clearance between the moving parts.
CAUTION