cylinder head | |
Maximum allowable flatness of the bottom surface of the head cylinder block |
0.1mm
|
Cylinder head height: | |
– standard |
131.45 – 131.55 mm
|
– minimum |
131.25 mm
|
Valve seat width: | |
– standard |
1.2 to 1.5 mm
|
- limiting |
2.0 mm
|
Protrusion of the swirl chamber |
0.001 – 0.030 mm
|
Valve recess in the cylinder head |
0.5 – 1.0 mm
|
piston pins | |
Diameter |
27 mm
|
Length |
60 mm
|
Piston pin clearance in the piston |
0.002 – 0.012 mm
|
Piston pin clearance in the connecting rod |
0.008 – 0.050 mm
|
valves | |
Valve stem diameter: | |
- inlet valve |
6.959 – 6.977 mm
|
- Exhaust valve |
6.960 – 6.978 mm
|
Valve guide bore diameter |
7.000 – 7.015 mm
|
Clearance between stem and valve guide: | |
- inlet valve: | |
standard |
0.023 – 0.056 mm
|
ultimate |
0.080 mm
|
- Exhaust valve: | |
standard |
0.030 to 0.063 mm
|
ultimate |
0.095 mm
|
Valve length: | |
- inlet valve |
104.05 mm
|
- Exhaust valve |
104.00 mm
|
Valve disc diameter: | |
- inlet valve |
34.6mm
|
- Exhaust valve |
30.6mm
|
Cylinder block | |
Engine cylinder diameter: | |
– size group A |
79.000 – 79.009 mm
|
– size group B |
79.010 – 79.019 mm
|
– size group C |
79.020 – 79.029 mm
|
Maximum cylinder out-of-roundness |
0.015 mm
|
Maximum taper of the cylinder |
0.015 mm
|
Main bearing diameter (without inserts): | |
– size group 1 |
55.992 – 56.000 mm
|
– size group 2 |
55.984 – 55.992 mm
|
– size group 3 |
55.976 – 55.984 mm
|
Pistons and rings | |
Piston diameter: | |
– size group A |
78.975 – 78.984 mm
|
– size group B |
78.965 – 78.994 mm
|
– size group C |
78.995 – 79.004 mm
|
Piston clearance in cylinder |
0.016 – 0.034 mm
|
Piston ring gaps (installed in a hole): | |
– top sealing ring |
0.25 – 0.80 mm
|
– lower sealing ring |
0.20 – 0.80 mm
|
- oil scraper ring |
0.20 – 0.80 mm
|
Piston ring clearance in piston: | |
– top sealing ring |
0.12 - 0.18 mm
|
– lower sealing ring |
0.05 – 0.15 mm
|
- oil scraper ring |
0.02 – 0.15 mm
|
Piston ring thickness: | |
– top sealing ring |
2.0 mm
|
– lower sealing ring |
2.0 mm
|
- oil scraper ring |
3.0mm
|
connecting rod | |
Lateral clearance of the lower head of the connecting rod |
0.20 – 0.40 mm
|
Maximum allowable weight difference between connecting rods |
4 g
|
Crankshaft | |
Axial play |
0.06 – 0.30 mm
|
Diameters of main journals: | |
– 1st size group |
51.928 – 51.938 mm
|
– 2nd size group |
51.918 – 51.928 mm
|
Operating clearance of the main bearing |
0.030 – 0.080 mm
|
Connecting Rod Bearing Working Clearance |
0.025 – 0.100 mm
|
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