Crankshaft drive, cylinder block
Illustration
1. |
Main bearing journal |
2. |
Con-rod bearing journal |
3. |
3 Main Bearing Journals (Guide Bearing) |
4. |
Crankshaft colour code |
5. |
Bearing shell colour code |
6. |
Bearing shell identification |
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Engine
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X 20 XEV, X 20 XER, Z 20 LET
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Crankshaft dimensions
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Ø Main bearing journal
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Colour code
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1 – 5
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Standard size
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mm
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57.974 – 57.981
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white
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mm
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57.981 – 57.988
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green
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mm
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57.988 – 57.995
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brown
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Undersize (0.25)
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mm
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57.732 – 57.738
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green/blue
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mm
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57.738 – 57.745
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brown/blue
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Undersize (0.50)
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mm
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57.482 – 57.488
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green/white
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mm
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57.488 – 57.495
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brown/white
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Ø Con-rod bearing journal
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1 – 4
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Standard size
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mm
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48.970 – 48.988
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-
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Undersize (0.25)
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mm
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48.720 – 48.738
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blue
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Undersize (0.50)
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mm
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48.470 – 48.488
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white
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3 wide main bearing journals (guide bearing)
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Standard size
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mm
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25.950 – 26.002
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-
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Undersize (0.20)
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mm
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26.150 – 26.202
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-
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Undersize (0.40)
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mm
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26.350 – 26.402
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-
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Engine
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X 20 XEV, X 20 XER, Z 20 LET
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Crankshaft bearing
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Lower crankshaft bearing shell
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1, 2, 4, 5
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Colour code
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Thickness
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Identification
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GM 985
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Standard size
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mm
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brown
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1.989 – 1.995
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662 N
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mm
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green
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1.995 – 2.001
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663 N
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mm
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white
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2.001 – 2.007
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528 N
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Undersize (0.25)
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mm
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brown/blue
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2.114 – 2.120
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664 A
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mm
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green/blue
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2.120 – 2.126
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665 A
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Undersize (0.50)
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mm
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brown/white
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2.239 – 2.245
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666 B
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mm
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green/white
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2.245 – 2.251
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667 B
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Upper crankshaft bearing shell
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Standard size
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mm
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brown
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1.989 – 1.995
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662 N
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mm
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green
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1.995 – 2.001
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663 N
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mm
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white
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2.001 – 2.007
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528 N
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Undersize (0.25)
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mm
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brown/blue
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2.114 – 2.120
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664 A
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mm
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green/blue
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2.120 – 2.126
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665 A
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Undersize (0.50)
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mm
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brown/white
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2.239 – 2.245
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666 B
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mm
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green/white
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2.245 – 2.251
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667 B
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Perm. crankshaft bearing play
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mm
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0.015 – 0.043
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Perm. crankshaft end play
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mm
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0.050 – 0.152
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Perm. out-of-round
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mm
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0.03
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Engine
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X 20 XEV, X 20 XER, Z 20 LET
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3 crankshaft bearings
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Lower crankshaft bearing shell
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(guide bearing)
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Colour code
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Thickness
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Identification
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GM 985
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Standard size
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mm
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brown
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1.989 – 1.995
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655 N
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mm
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green
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1.995 – 2.001
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656 N
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mm
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white
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2.001 – 2.007
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126 N
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Undersize (0.25)
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mm
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brown/blue
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2.114 – 2.120
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657 A
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mm
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green/blue
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2.120 – 2.126
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658 A
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Undersize (0.50)
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mm
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brown/white
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2.239 – 2.245
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659 B
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mm
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green/white
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2.245 – 2.251
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660 B
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Upper crankshaft bearing shell
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Standard size
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mm
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brown
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1.989 – 1.995
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655 N
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mm
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green
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1.995 – 2.001
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656 N
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mm
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white
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2.001 – 2.007
|
126 N
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Undersize (0.25)
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mm
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brown/blue
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2.114 – 2.120
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657 A
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mm
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green/blue
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2.120 – 2.126
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658 A
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Undersize (0.50)
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mm
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brown/white
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2.239 – 2.245
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659 B
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mm
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green/white
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2.245 – 2.251
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660 B
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Engine
|
|
X 20 XEV, X 20 XER, Z 20 LET
|
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|
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3 wide main bearing journals (guide bearing)
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Colour code
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Width
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Identification
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Standard size
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mm
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brown – green – white
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25.850 – 25.900
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-
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Undersize (0.25)
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mm
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brown / blue green / blue
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26.050 – 26.100
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-
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Undersize (0.50)
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mm
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brown / white green / white
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26.250 – 26.300
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-
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Engine
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X 20 XEV, X 20 XER
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Con-rod bearing
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Lower con-rod bearing shell
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Colour code
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Thickness
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Identification
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GM 124
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Standard size
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mm
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-
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1.490 – 1.500
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623 N
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Undersize (0.25)
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mm
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blue
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1.615 – 1.625
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624 A
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Undersize (0.50)
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mm
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white
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1.740 – 1.750
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625 B
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Upper con-rod bearing shell
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Standard size
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mm
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-
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1.490 – 1.500
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623 N
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Undersize (0.25)
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mm
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blue
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1.615 – 1.625
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624 A
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Undersize (0.50)
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mm
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white
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1.740 – 1.750
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625 B
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Perm.
|
Con-rod bearing play
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mm
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0.006 – 0.031
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Engine
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Z 20 LET
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Con-rod bearing
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Lower con-rod bearing shell
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Colour code
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Thickness
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Identification
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GM 272
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Standard size
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mm
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-
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1.490 – 1.500
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202 N
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Undersize (0.25)
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mm
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blue
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1.615 – 1.625
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203 A
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Undersize (0.50)
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mm
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purple
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1.740 – 1.750
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204 B
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Upper con-rod bearing shell
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Standard size
|
mm
|
-
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1.490 – 1.500
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202 N
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Undersize (0.25)
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mm
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blue
|
1.615 – 1.625
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203 A
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Undersize (0.50)
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mm
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purple
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1.740 – 1.750
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204 B
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Perm.
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Con-rod bearing play
|
mm
|
|
0.006 – 0.031
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Illustration
1. |
Index-identification of cylinder bore |
2. |
Cylinder Bore |
3. |
Double bevelled ring with spiral-type expander |
4. |
Tapered compression ring or double trapezoidal
ring |
5. |
Rectangular compression ring |
6. |
Piston diameter |
|
|
Engine
|
|
X 20 XEV, X 20 XER
|
Z 20 LET
|
|
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|
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Ø cylinder bore
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|
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Standard size
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Index
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99
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mm
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85.985 – 85.995
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Index
|
00
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mm
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85.995 – 86.005
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Index
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01
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mm
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86.005 – 86.015
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Index
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05
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mm
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86.045 – 86.055
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Oversize 1)
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Index 0 + 0.5
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mm
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86.495 – 86.505
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Ø Piston
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Standard size
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Index
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99
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mm
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85.967 – 85.983
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85.942 – 85.958
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Index
|
00
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mm
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85.977 – 85.993
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85.952 – 85.968
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Index
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01
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mm
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85.987 – 86.003
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85.987 – 86.003
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Index
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05
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mm
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86.027 – 86.043
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86.002 – 86.018
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Oversize
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Index 0 + 0.5
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mm
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86.477 – 86.493
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86.452 – 86.468
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Piston play
|
mm
|
0.002 – 0.028
|
0.027 – 0.053
|
Piston projection
|
mm
|
0.4
|
|
Engine
|
|
X 20 XEV, X 20 XER
|
Z 20 LET
|
|
|
|
|
Piston Rings
|
|
|
|
|
Rectangular compression ring
|
|
|
|
|
|
Height
|
mm
|
1.50
|
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|
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Gap
|
mm
|
0.30 – 0.50
|
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Vertical play
|
mm
|
0.02 – 0.04
|
|
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Tapered compression ring
|
|
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Height
|
mm
|
1.50
|
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Gap
|
mm
|
0.30 – 0.50
|
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Vertical play
|
mm
|
0.02 – 0.04
|
|
|
Oil scraper ring
|
|
|
|
|
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Height
|
mm
|
3.0
|
2.44 – 2.52
|
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Gap
|
mm
|
0.4 – 1.4
|
0.5
|
|
|
Vertical play
|
mm
|
0.01 – 0.03
|
0.01 – 0.03
|
Ring gap distribution
2)
°
|
|
120
|
Engine
|
|
X 20 XEV
|
X 20 XER, Z 20 LET
|
|
|
|
|
Piston Pins
|
|
|
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Length
|
mm
|
61.2 – 61.5
|
|
Diameter
|
mm
|
20.99 – 21.00
|
|
Bearing
|
|
shrink-fit in con-rod
|
floating in con-rod
|
|
Play
|
|
|
|
|
|
in piston
|
mm
|
0.007 – 0.022
|
|
|
in con-rod
|
mm
|
0
|
0.014 - 0.025
|
1 ) After re-boring, the old index must be
invalidated and the new oversizing index must be embossed.
2 ) Arrange gap of upper oil scraper ring 25 to 50
mm offset to the left and gap of the lower ring 25 to 50 mm offset
to the right relative to the gap of the lower intermediate ring.
|