|
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 |
|
|
|
Engine
|
|
X 20 XEV, X 20 XER, Z 20 LET
|
|
|
|
|
|
Crankshaft dimensions
|
|
Ø Main bearing journal
|
Colour code
|
|
|
|
1 – 5
|
|
|
|
Standard size
|
mm
|
57.974 – 57.981
|
white
|
|
|
|
mm
|
57.981 – 57.988
|
green
|
|
|
|
mm
|
57.988 – 57.995
|
brown
|
|
|
Undersize (0.25)
|
mm
|
57.732 – 57.738
|
green/blue
|
|
|
|
mm
|
57.738 – 57.745
|
brown/blue
|
|
|
Undersize (0.50)
|
mm
|
57.482 – 57.488
|
green/white
|
|
|
|
mm
|
57.488 – 57.495
|
brown/white
|
|
|
|
|
Ø Con-rod bearing journal
|
|
|
|
|
1 – 4
|
|
|
|
Standard size
|
mm
|
48.970 – 48.988
|
-
|
|
|
Undersize (0.25)
|
mm
|
48.720 – 48.738
|
blue
|
|
|
Undersize (0.50)
|
mm
|
48.470 – 48.488
|
white
|
|
|
|
|
3 wide main bearing journals (guide bearing)
|
|
|
|
Standard size
|
mm
|
25.950 – 26.002
|
-
|
|
|
Undersize (0.20)
|
mm
|
26.150 – 26.202
|
-
|
|
|
Undersize (0.40)
|
mm
|
26.350 – 26.402
|
-
|
|
Engine
|
|
X 20 XEV, X 20 XER, Z 20 LET
|
|
|
|
|
|
Crankshaft bearing
|
|
Lower crankshaft bearing shell
|
|
1, 2, 4, 5
|
|
Colour code
|
Thickness
|
Identification
|
|
|
|
|
|
GM 985
|
|
|
Standard size
|
mm
|
brown
|
1.989 – 1.995
|
662 N
|
|
|
|
mm
|
green
|
1.995 – 2.001
|
663 N
|
|
|
|
mm
|
white
|
2.001 – 2.007
|
528 N
|
|
|
Undersize (0.25)
|
mm
|
brown/blue
|
2.114 – 2.120
|
664 A
|
|
|
|
mm
|
green/blue
|
2.120 – 2.126
|
665 A
|
|
|
Undersize (0.50)
|
mm
|
brown/white
|
2.239 – 2.245
|
666 B
|
|
|
|
mm
|
green/white
|
2.245 – 2.251
|
667 B
|
|
|
|
|
Upper crankshaft bearing shell
|
|
|
Standard size
|
mm
|
brown
|
1.989 – 1.995
|
662 N
|
|
|
|
mm
|
green
|
1.995 – 2.001
|
663 N
|
|
|
|
mm
|
white
|
2.001 – 2.007
|
528 N
|
|
|
Undersize (0.25)
|
mm
|
brown/blue
|
2.114 – 2.120
|
664 A
|
|
|
|
mm
|
green/blue
|
2.120 – 2.126
|
665 A
|
|
|
Undersize (0.50)
|
mm
|
brown/white
|
2.239 – 2.245
|
666 B
|
|
|
|
mm
|
green/white
|
2.245 – 2.251
|
667 B
|
|
Perm. crankshaft bearing play
|
mm
|
0.015 – 0.043
|
|
Perm. crankshaft end play
|
mm
|
0.050 – 0.152
|
|
Perm. out-of-round
|
mm
|
0.03
|
|
Engine
|
|
X 20 XEV, X 20 XER, Z 20 LET
|
|
|
|
|
|
3 crankshaft bearings
|
|
Lower crankshaft bearing shell
|
|
(guide bearing)
|
|
Colour code
|
Thickness
|
Identification
|
|
|
|
|
|
GM 985
|
|
|
Standard size
|
mm
|
brown
|
1.989 – 1.995
|
655 N
|
|
|
|
mm
|
green
|
1.995 – 2.001
|
656 N
|
|
|
|
mm
|
white
|
2.001 – 2.007
|
126 N
|
|
|
Undersize (0.25)
|
mm
|
brown/blue
|
2.114 – 2.120
|
657 A
|
|
|
|
mm
|
green/blue
|
2.120 – 2.126
|
658 A
|
|
|
Undersize (0.50)
|
mm
|
brown/white
|
2.239 – 2.245
|
659 B
|
|
|
|
mm
|
green/white
|
2.245 – 2.251
|
660 B
|
|
|
|
|
Upper crankshaft bearing shell
|
|
|
Standard size
|
mm
|
brown
|
1.989 – 1.995
|
655 N
|
|
|
|
mm
|
green
|
1.995 – 2.001
|
656 N
|
|
|
|
mm
|
white
|
2.001 – 2.007
|
126 N
|
|
|
Undersize (0.25)
|
mm
|
brown/blue
|
2.114 – 2.120
|
657 A
|
|
|
|
mm
|
green/blue
|
2.120 – 2.126
|
658 A
|
|
|
Undersize (0.50)
|
mm
|
brown/white
|
2.239 – 2.245
|
659 B
|
|
|
|
mm
|
green/white
|
2.245 – 2.251
|
660 B
|
|
Engine
|
|
X 20 XEV, X 20 XER, Z 20 LET
|
|
|
|
|
|
3 wide main bearing journals (guide bearing)
|
|
Colour code
|
Width
|
Identification
|
|
|
Standard size
|
mm
|
brown – green – white
|
25.850 – 25.900
|
-
|
|
|
Undersize (0.25)
|
mm
|
brown / blue green / blue
|
26.050 – 26.100
|
-
|
|
|
Undersize (0.50)
|
mm
|
brown / white green / white
|
26.250 – 26.300
|
-
|
|
Engine
|
|
X 20 XEV, X 20 XER
|
|
|
|
|
|
Con-rod bearing
|
|
Lower con-rod bearing shell
|
|
|
|
|
Colour code
|
Thickness
|
Identification
|
|
|
|
|
|
|
GM 124
|
|
|
Standard size
|
mm
|
-
|
1.490 – 1.500
|
623 N
|
|
|
Undersize (0.25)
|
mm
|
blue
|
1.615 – 1.625
|
624 A
|
|
|
Undersize (0.50)
|
mm
|
white
|
1.740 – 1.750
|
625 B
|
|
|
|
|
Upper con-rod bearing shell
|
|
|
Standard size
|
mm
|
-
|
1.490 – 1.500
|
623 N
|
|
|
Undersize (0.25)
|
mm
|
blue
|
1.615 – 1.625
|
624 A
|
|
|
Undersize (0.50)
|
mm
|
white
|
1.740 – 1.750
|
625 B
|
|
Perm.
|
Con-rod bearing play
|
mm
|
|
0.006 – 0.031
|
|
|
Engine
|
|
Z 20 LET
|
|
|
|
|
|
Con-rod bearing
|
|
Lower con-rod bearing shell
|
|
|
|
|
Colour code
|
Thickness
|
Identification
|
|
|
|
|
|
|
GM 272
|
|
|
Standard size
|
mm
|
-
|
1.490 – 1.500
|
202 N
|
|
|
Undersize (0.25)
|
mm
|
blue
|
1.615 – 1.625
|
203 A
|
|
|
Undersize (0.50)
|
mm
|
purple
|
1.740 – 1.750
|
204 B
|
|
|
|
|
Upper con-rod bearing shell
|
|
|
Standard size
|
mm
|
-
|
1.490 – 1.500
|
202 N
|
|
|
Undersize (0.25)
|
mm
|
blue
|
1.615 – 1.625
|
203 A
|
|
|
Undersize (0.50)
|
mm
|
purple
|
1.740 – 1.750
|
204 B
|
|
Perm.
|
Con-rod bearing play
|
mm
|
|
0.006 – 0.031
|
|
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
|
|
|
|
|
|
|
Ø cylinder bore
|
|
|
|
|
|
Standard size
|
|
|
|
|
|
|
Index
|
99
|
|
mm
|
85.985 – 85.995
|
|
|
|
|
Index
|
00
|
|
mm
|
85.995 – 86.005
|
|
|
|
|
Index
|
01
|
|
mm
|
86.005 – 86.015
|
|
|
|
|
Index
|
05
|
|
mm
|
86.045 – 86.055
|
|
|
|
Oversize 1)
|
|
|
|
|
|
|
Index 0 + 0.5
|
mm
|
86.495 – 86.505
|
|
|
Ø Piston
|
|
|
|
|
|
Standard size
|
|
|
|
|
|
|
Index
|
99
|
|
mm
|
85.967 – 85.983
|
85.942 – 85.958
|
|
|
|
Index
|
00
|
|
mm
|
85.977 – 85.993
|
85.952 – 85.968
|
|
|
|
Index
|
01
|
|
mm
|
85.987 – 86.003
|
85.987 – 86.003
|
|
|
|
Index
|
05
|
|
mm
|
86.027 – 86.043
|
86.002 – 86.018
|
|
|
Oversize
|
|
|
|
|
|
|
Index 0 + 0.5
|
mm
|
86.477 – 86.493
|
86.452 – 86.468
|
|
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
|
|
|
|
|
Gap
|
mm
|
0.30 – 0.50
|
|
|
|
|
Vertical play
|
mm
|
0.02 – 0.04
|
|
|
|
Tapered compression ring
|
|
|
|
|
|
|
Height
|
mm
|
1.50
|
|
|
|
|
Gap
|
mm
|
0.30 – 0.50
|
|
|
|
|
Vertical play
|
mm
|
0.02 – 0.04
|
|
|
|
Oil scraper ring
|
|
|
|
|
|
|
Height
|
mm
|
3.0
|
2.44 – 2.52
|
|
|
|
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
|
|
|
|
|
|
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.
|
