AR03.20-W-4355B | Measure crankshaft and remount in bearings | 12.12.08 |
ENGINES 902.9 in MODEL 957 with CODE (MS8) Natural gas engine
ENGINES 904.904 in MODEL 670
ENGINES 904.908 /914 /923 /936 in MODELS 668, 670
ENGINES 904.9 in MODEL 374, 375, 673, 674, 676, 958, 970, 972, 975, 976
ENGINES 906.9 in MODEL 374, 958, 970, 972, 974, 975, 976
ENGINES 906.9 in MODEL 374, 375, 950, 952, 953, 954, 957, 958
W03.20-0042-09
Shown on engine 904.9
1 Crankshaft
2 Hardness tester
3 Outside micrometer
4 Main bearing cap
5 Main bearing bolts
F Fillet radii of main and connecting rod journals
G Spherical shape of main and connecting rod bearing journals
H Main bearing inside Ø when installed
A Main bearing journal Ø
B Fitted bearing journal width
C Main bearing journal width
D Connecting rod bearing journal Ø
E Connecting rod bearing journal width
W03.20-0043-05
Shown on engine 904.9
1 Crankshaft
7 Dial indicator
8 Dial indicator holder
| Checking | ||
1 | Remove crankshaft (1) | ||
2 | Clean engine parts | Any chips which are present must be taken away after bearing damage has occurred: | |
Clean main oil gallery. | |||
3 | Clean crankshaft (1) | ||
4 | Check front crankshaft flange for wear | Machine crankshaft (1) if these is wear. | |
5 | Inspect main and connecting rod bearing journals for damage and cracks | If damage or cracks are present: | |
Replace crankshaft (1). | |||
| Measure | ||
6 | Measure hardness of main bearing shaft and connecting rod bearing shaft journals of the crankshaft (1) using the hardness tester (2) | The main bearing shaft and connecting rod bearing shaft journals of the crankshaft (1) to be checked must be subjected to testing. The hardness value must be at least two thirds of the circumference of the bearing journal. | |
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If hardness value is not attained: | |||
Replace crankshaft (1). | |||
7 | Measure smooth operation of the crankshaft (1) using dial indicator (7) and dial indicator holder (8) | Place crankshaft (1) on external main bearing journals. | |
Main and connecting rod bearing journals permissible out-of-roundness variation | |||
Permissible lateral runout at fitted bearing journal | |||
Concentricity deviation measured at middle main bearing journal (support on outer main bearing journal) | |||
Engine 904 | |||
Imbalance of crankshaft (with pin for fixing flywheel but without flywheel), mounted at outer main bearings. | |||
Engine 902, 906 | |||
Permissible imbalance of crankshaft (with pin for locating flywheel but without flywheel), mounted at main bearings two and six. | |||
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If values are outside tolerance: | |||
Replace crankshaft (1). | |||
8 | Measure main and connecting rod bearing journals | Clean crankshaft (1) bearing point with a chamois leather. | |
Measure main bearing journal Ø (A) with the micrometer (3) at two points | |||
Fit bearing journal width (B) | |||
Main bearing journal width (C) | |||
Measure connecting rod journal Ø (A) with the micrometer (3) at two points | |||
Connecting rod bearing journal width (E) | |||
Permissible conicity at main bearing journal and at connecting rod bearing journal | |||
Fillet radii (F) of main and connecting rod bearing journals | |||
Convexity of main and connecting rod bearing journals | |||
If damage and wear present: | |||
Machine crankshaft (1) to the next deviation or replace. | |||
Mounting | |||
9 | Mount crankshaft (1) radially in bearings | Clean crankshaft (1) bearing point with a chamois leather. | |
Main bearing journal Ø (A) | |||
Main bearing inner Ø (H) when installed | |||
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10 | Install crankshaft (1) |
Check values for a crankshaft
Number | Designation | Engine | Engine | ||
BE03.20-N-1001-02B | Main bearing journal Ø | Default | mm | 85.990...86.010 | 85.990...86.010 |
Deviation -0.1 | mm | 85.890...85.910 | 85.890...85.910 | ||
Deviation -0.25 | mm | 85.740...85.760 | 85.740...85.760 | ||
Deviation -0.5 | mm | 85.490...85.510 | 85.490...85.510 | ||
Deviation -0.75 | mm | 85.240...85.260 | 85.240...85.260 | ||
Deviation -1.0 | mm | 84.990...85.010 | 84.990...85.010 | ||
BE03.20-N-1002-02B | Fitted bearing journal width | Standard Ø | mm | 85.990...86.010 | 85.990...86.010 |
Standard width | mm | 31.000...31.062 | 31.000...31.062 | ||
Ø deviation -0.1 | mm | 85.890...85.910 | 85.890...85.910 | ||
Standard width | mm | 31.000...31.062 | 31.000...31.062 | ||
Ø deviation -0.1 | mm | 85.890...85.910 | 85.890...85.910 | ||
Width deviation 0.3 | mm | 31.300...31.362 | 31.300...31.362 | ||
Ø deviation -0.25 | mm | 85.740...85.760 | 85.740...85.760 | ||
Width deviation 0.3 | mm | 31.300...31.362 | 31.300...31.362 | ||
Ø deviation -0.5 | mm | 85.490...85.510 | 85.490...85.510 | ||
Width deviation 0.5 | mm | 31.500...31.562 | 31.500...31.562 | ||
Dia. deviation -0.75 | mm | 85.240...85.260 | 85.240...85.260 | ||
Width deviation 0.5 | mm | 31.500...31.562 | 31.500...31.562 | ||
Ø deviation -1.0 | mm | 84.990...85.010 | 84.990...85.010 | ||
Width deviation 0.5 | mm | 31.500...31.562 | 31.500...31.562 | ||
BE03.20-N-1003-02B | Main bearing journal width | mm | 31.0...31.2 | 31.0...31.2 | |
BE03.20-N-1004-02B | Connecting rod bearing journal Ø | Default | mm | 69.995...70.015 | 69.995...70.015 |
Deviation -0.1 | mm | 69.895...69.915 | 69.895...69.915 | ||
Deviation -0.25 | mm | 69.745 ...69.765 | 69.745 ...69.765 | ||
Deviation -0.5 | mm | 69.495...69.515 | 69.495...69.515 | ||
Deviation -0.75 | mm | 69.245...69.265 | 69.245...69.265 | ||
Deviation -1.0 | mm | 68.995...69.015 | 68.995...69.015 | ||
BE03.20-N-1005-02B | Connecting rod bearing journal width | mm | 34.0...34.2 | 34.0...34.2 | |
BE03.20-N-1008-02B | Main and connecting rod bearing journals permissible out-of-roundness variation | Limit value | mm | 0.005 | 0.005 |
BE03.20-N-1009-02B | Permissible taper | Main bearing journals | mm | 0.005 | 0.005 |
Connecting rod bearing journals | mm | 0.005 | 0.005 | ||
BE03.20-N-1010-02B | Permissible lateral runout | Fit bearing journal | mm | 0.015 | 0.015 |
BE03.20-N-1011-02B | Variation in concentricity measured at middle main bearing journal (mounted at outer main bearing journals) | mm | 0.15 | 0.11 | |
BE03.20-N-1012-02B | Fillet radii | Main bearing journals | mm | 2.5...3.0 | 2.5...3.0 |
Connecting rod bearing journals | mm | 2.5...3.0 | 2.5...3.0 | ||
BE03.20-N-1013-02B | Hardness of main bearing and connecting rod bearing journals (Rockwell hardness) | HRC | 52 | 52 | |
BE03.20-N-1014-02B | Spherical shape | Main bearing journals | mm | 0.000...0.004 | 0.000...0.004 |
Connecting rod bearing journals | mm | 0.000...0.004 | 0.000...0.004 | ||
BE03.20-N-1015-02B | Main bearing inside Ø | Default | mm | 86.066...86.108 | 86.066...86.108 |
Deviation 0.1 | mm | 85.966...86.008 | 85.966...86.008 | ||
Deviation 0.25 | mm | 85.816...85.858 | 85.816...85.858 | ||
Deviation 0.5 | mm | 85.566...85.608 | 85.566...85.608 | ||
Deviation 0.75 | mm | 85.316...85.358 | 85.316...85.358 | ||
Deviation 1.0 | mm | 85.066...85.108 | 85.066...85.108 | ||
BE03.20-N-1019-02B | Maximum approved deviation from perfect crankshaft balance (with flywheel mounting stud, but without flywheel) at the front and rear main bearings. | gcm | - | 30 | |
BE03.20-N-1021-02B | Permissible imbalance of crankshaft (with pin for locating flywheel but without flywheel), mounted at main bearings two and six. | gcm | 30 | - | |
Crankcase, timing case cover, end cover
Number | Designation | Engines 900.9, 902.9, 904.9, 906.9 | ||
BA01.40-N-1001-01C | Bolt from main bearing cap to crankcase | Stage 1 | Nm | 30 |
Stage 2 | Nm | 80 | ||
Stage 3 | Nm | 155 | ||
Stage 4 | ° | 90 | ||
363 589 02 21 00
000 589 20 21 00
001 589 53 21 00
Dial indicator holder
Dial indicator
Hardness tester