NANO

141 / 1980

ENGINE 273 MPFI
135
ENGINE
Stage Crank case main bearing bore Crank case main bearing
dia.with bearing shell (mm) journal dia. (mm)
Standard 45.02 to 45.043 44.989 to 45
CRANKSHAFT AND MAIN BEARING
Stage Width of main bearing journal mm (for axial location)
Standard 25.00 to 25.052
Thickness of thrust washers (standard) 2.52 mm
Fillet radius of main bearing journals NA
Fillet radius of crank pin journal NA
Width 1st main bearing journals 25.8±0.4
Width 3rd main bearing journals 25.8 +0.2
Width crank pin journal 22 + 0.2 mm
Maximum permissible circularity main bearing journal 0.0025 mm
Cylindricity of main bearing journal 0.005 mm
Maximum permissible cylindricity of crank pin 0.005 mm
Maximum permissible run out of 2nd main bearing journals 0.02 mm
with respect to 1st and 3rd journal
Maximum permissible out of parallelism between crank pin & main journal axis 0.01 mm
Main bearing parent bore dia. in crankcase 49.00/49.011
Maximum permissible concentricity of main bearing parent bore 0.02 mm
Maximum permissible cylindricity of main bearing parent bore 0.01 mm
Crankshaft journal to main bearing clearance 0.020-0.054 mm
ASSEMBLY CLEARANCE :
DESCRIPTION VALUE (MM)
Main bearing clearance in cold condition 0.020 to 0.054
Balancer bearing clearance in cold condition 0.031 to 0.069
Crankshaft axial play 0.06 to 0.245
Balancer shaft axial play for 2nd bearing 0.1 to 0.252
Balancer shaft axial play for 3rd bearing 0.1 to 0.2
Piston projection on cylinder crankcase -0.413 to -0.715
Gap between crankshaft speed sensor and sensor wheel 0.5 to 1.4
Connecting rod bearing clearance in cold condition 0.015 to 0.058
Connecting rod axial play 0.05 to 0.35
Piston to cylinder bore clearance 0.035 to 0.050
Camshaft bearing clearance cold condition 0.027 to 0.053
Camshaft axial play 0.1 to 0.3
Tappet clearance INLET 0.15
Tappet clearance EXHAUST 0.25
Valve guide clearance INLET 0.025 to 0.051
Valve guide clearance EXHAUST 0.057 to 0.083