AR03.20-A-4465A | Machine crankshaft | 11.12.08 |
ENGINE 457.939 /945 /946 /949 in MODEL NAB372.124
ENGINE 457.939 /945 in MODEL NAB372.317
A03.20-0017-06
1 Crankshaft
2 Counterweight
3 Screw
4 Crankshaft sprocket
5 Dowel pin
A Main bearing journal dia.
B Connecting rod bearing journal dia.
C Fitted bearing journal width
D Main bearing journal width
E Connecting rod bearing journal width
F Fillet radii
G Spherical shape
L Shank length
| Removing | ||
1 | Remove crankshaft (1) | ||
Machining | |||
2 | Inspect crankshaft (1) for damage and cracks | Inspect main and connecting rod bearing journals in particular. If damage or cracks are present: | |
Replace crankshaft (1). | |||
3 | Measure crankshaft (1) | Check journals and establish repair stages for machining. | |
If the permissible dimensions for machining are not achieved: | |||
Replace crankshaft (1). | |||
| Removing | ||
4 | Take off crankshaft sprocket (4) | Carefully detach crankshaft gear (4) if necessary using a plastic mallet. | |
5 | Remove counterweights (2) | Mark counterweights (2) relative to matching position on crankshaft. | |
Machining | |||
6 | Machine main bearing journal | All main bearing journals must have the same repair size. | |
Depending on the repair size of main bearing journal dia. (A), the fit bearing journal width (C) of the fit bearing journal must have a matching repair size: (A) Normal, Normal I (C) Normal (A) Repair Stage I or II (C) Repair Stage I (A) Repair Stage III or IV (C) Repair Stage II | |||
Main bearing journal diameter (A) | |||
Fit bearing journal width (C) | |||
Main bearing journal width (D) | |||
Fillet radii (F) | |||
Spherical shape (G) | |||
Maximum out-of-roundness and conicity | |||
Maximum peak-to-valley height of bearing journals | |||
7 | Machine connecting rod bearing journals | All connecting rod bearing journals must have the same repair size. | |
Connecting rod bearing journal dia. (B) | |||
Connecting rod bearing journal width (E) | |||
Fillet radii (F) | |||
Spherical shape (G) | |||
Maximum out-of-roundness and conicity | |||
Maximum peak-to-valley height of bearing journals | |||
8 | Clean crankshaft (1) | Deburr oil drillings on bearing journals. | |
Wash crankshaft (1) with diesel fuel and clean holes with a round brush. | |||
9 | Inspect hardness of main and connecting rod bearing journals | The bearing journal to be tested must be placed on a base for the test. The hardness must be achieved around at least two thirds of the circumference of the bearing journal, if necessary: | |
Replace crankshaft (1). | |||
| |||
10 | Check bolt (3) shank length (L) | Replace, if necessary. | |
| Install | ||
11 | Attach counterweights (2) | Observe installation marking! | |
Lightly oil the bolts (3) on thread and on contact surface of screw head. | |||
| |||
12 | Check imbalance of crankshaft (1) | Check crankshaft (1) with counterweights but without flywheel. | |
13 | Attach crankshaft sprocket (4) | Replace dowel pin (5). | |
14 | Install crankshaft (1) |
Check values for a crankshaft
Number | Designation | Engine | Engine | ||
BE03.20-N-1001-02J | Connecting rod bearing journal dia. | Normal | mm | 89.980 to 90.000 | 89.980 to 90.000 |
Standard I | mm | 89.880 to 89.900 | 89.880 to 89.900 | ||
Repair size I | mm | 89.730 to 89.750 | 89.730 to 89.750 | ||
Repair size II | mm | 89.480 to 89.500 | 89.480 to 89.500 | ||
Repair size III | mm | 89.230 to 89.250 | 89.230 to 89.250 | ||
Repair size IV | mm | 88.980 to 89.000 | 88.980 to 89.000 | ||
BE03.20-N-1002-02J | Connecting rod bearing journal width | mm | 46.0 to 46.1 | 46.0 to 46.1 | |
BE03.20-N-1003-02J | Hardness of main bearing and connecting rod bearing journals (Rockwell hardness) | HRC | 53 to 59 | 53 to 59 | |
BE03.20-N-1004-02J | Main bearing journal dia. | Normal | mm | 103.980 to 104.000 | 103.980 to 104.000 |
Standard I | mm | 103.880 to 103.900 | 103.880 to 103.900 | ||
Repair size I | mm | 103.730 to 103.750 | 103.730 to 103.750 | ||
Repair size II | mm | 103.480 to 103.500 | 103.480 to 103.500 | ||
Repair size III | mm | 103.230 to 103.250 | 103.230 to 103.250 | ||
Repair size IV | mm | 102.980 to 103.000 | 102.980 to 103.000 | ||
BE03.20-N-1005-02J | Fitted bearing journal width | Normal | mm | 46.000 to 46.062 | 46.000 to 46.062 |
Repair size I | mm | 46.500 to 46.562 | 46.500 to 46.562 | ||
Repair size II | mm | 47.000 to 47.062 | 47.000 to 47.062 | ||
BE03.20-N-1006-02J | Main bearing journal width | mm | 46.000 to 46.250 | 46.000 to 46.250 | |
BE03.20-N-1009-02J | Fillet radii | Main bearing journals | mm | 4.2 to 4.5 | 4.2 to 4.5 |
Connecting rod bearing journals | mm | 4.2 to 4.5 | 4.2 to 4.5 | ||
BE03.20-N-1010-02J | 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-1011-02J | Out-of-roundness and taper, main and connecting rod bearing journals | Limit value for reuse | mm | 0.02 | 0.02 |
Replacing or machining crankshaft | mm | 0.01 | 0.01 | ||
BE03.20-N-1015-02J | Peak-to-valley height of journals | (Rt) | mm | 0.0015 | 0.0015 |
BE03.20-N-1016-02J | Permissible imbalance of crankshaft | at 400 rpm-1 | Ncm | 0.6 | 0.6 |
BE03.20-N-1017-02J | Bolt, counterweight to crankshaft | Shank length (L) when new | mm | 69.95 to 70.00 | 69.95 to 70.00 |
permissible shank length (L) | mm | 71.20 | 71.20 | ||
Crankshaft
Number | Designation | Engine 457.939/ | Engine 457.945/ | ||
BA03.20-N-1001-01E | Bolt, counterweight to crankshaft | Stage 1 | Nm | 140 | 140 |
Stage 2 | Nm | - | - | ||
Stage 3 | ° | 90 | 90 | ||
Hardness tester
000 589 20 21 00
Referenced documents
- ar0320a4351a Remove/install crankshaft
- ar0320a4355a Measure crankshaft and remount in bearings