
| ENGINE BEARINGS | ||
![]() |
MAIN BEARING SET |
|
| Part# | ||
| 5M1237H |
5M1237HX |
|
| Sizes | STD, .025, .25 | STD |
| Oil Clearance | Standard | + 0.001" Extra |
| Half Type | Upper & Lower | |
| Material | Tri-Metal | |
| Min Std Shaft Size |
2.0462 in / 51.973 mm |
|
| Max Std Shaft Size |
2.0467 in / 51.985 mm |
|
| Min Std Tunnel Size |
2.2047 in / 56.000 mm |
|
| Max Std Tunnel Size |
2.2054 in / 56.018 mm |
|
| Max Wall at Crown |
0.0786 in / 1.996 mm |
0.0781 in / 1.983 mm |
| Max Overall Length |
0.709 in / 18.00 mm |
|
| Notes | - | |
|
Diagram |
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|

| ENGINE BEARINGS | ||
![]() |
CON ROD BEARING SET |
|
| Part# | ||
| 4B1236H |
4B1236HX |
|
| Sizes | STD, .025, .25 | STD |
| Oil Clearance | Standard | + 0.001" Extra |
| Half Type | Identical Halves | |
| Material |
Tri-metal Hardened steel backs |
|
| Min Std Shaft Size |
2.0454in / 51.954 mm |
|
| Max Std Shaft Size |
2.0461in / 51.972 mm |
|
| Min Std Tunnel Size |
2.1654 in / 55.000 mm |
|
| Max Std Tunnel Size |
2.1657 in / 55.010 mm |
|
| Max Wall at Crown |
0.0591in / 1.500 mm |
0.0585in / 1.487 mm |
| Max Overall Length |
0.669 in / 17.00 mm |
|
| Notes | - | |
|
Diagram |
![]() |
|


|
|||||||
| Quantity | 4 | ||||||
| Crankshaft | 47.777 / 47.757 | ||||||
| Housing | 50.599 / 50.620 | ||||||
| Max Wall | 1.402 | ||||||
| Max Length | 18.971 |

| Position | 1,2,3,4,5,6 | ||||||
|---|---|---|---|---|---|---|---|
| Pairs & PN |
|
||||||
| Quantity | 6 | ||||||
| Crankshaft | 57.978 / 57.958 | ||||||
| Housing | 63.000 / 63.017 | ||||||
| Max Wall | 2.499 | ||||||
| Max Length | 18.471 |

| Position | 1,2,3,4,5,6 | ||||||
|---|---|---|---|---|---|---|---|
| Pairs & PN |
|
||||||
| Quantity | 6 | ||||||
| Crankshaft | 57.978 / 57.958 | ||||||
| Housing | 63.000 / 63.017 | ||||||
| Max Wall | 2.499 | ||||||
| Max Length | 18.471 |

|
|||||||
| Quantity | 4 | ||||||
| Crankshaft | 47.777 / 47.757 | ||||||
| Housing | 50.599 / 50.620 | ||||||
| Max Wall | 1.402 | ||||||
| Max Length | 18.971 |

Upper | Lower | Quantity | Position | Crankshaft | Housing | Max Length | Max Wall |
|---|---|---|---|---|---|---|---|
AM ![]() |
5 | 45.96 / 45.94 | 49.01 / 49.00 | 19.0 | 1.502 |

| Position | 1,2,3,4,5,6 | ||||||
|---|---|---|---|---|---|---|---|
| Pairs & PN |
|
||||||
| Quantity | 6 | ||||||
| Crankshaft | 57.978 / 57.958 | ||||||
| Housing | 63.000 / 63.017 | ||||||
| Max Wall | 2.499 | ||||||
| Max Length | 18.471 |


Manufacturer: ACL Bearing Company
Part number: 4B1490H-STD
For BMW - 1.6 1.8 1.9 (M40, M42, M43, M44)