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Build the BMW N63 or S63 with Measured ACL Race Series Clearance
ACL Race Series 5M1573HX-STD is a standard-size crankshaft main-bearing set for BMW N63B44 and S63B44 4.4-liter V8 engines. Its HX configuration provides additional oil clearance compared with the corresponding H-STD set. Confirm the engine code, crankshaft condition, housing dimensions, and target assembled clearance with a qualified engine builder before ordering.
Key Features
- Race Series performance main bearings for BMW N63B44 and S63B44 V8 engines
- Standard-size HX configuration with approximately 0.001 inch (0.025 mm) additional oil clearance
- Upper and lower bearing halves using ACL F780 material
- Published 70.000 to 70.019 mm housing-bore range
- Exact manufacturer part number 5M1573HX-STD
- Manufactured in Australia
Fitment
| Years | Make | Model | Verified Application |
|---|---|---|---|
| 2009–2012 | BMW | 750i | N63B44 4.4L V8; verify engine and measured clearances |
| 2013–2016 | BMW | M5 | S63B44 4.4L V8; verify engine and measured clearances |
| 2012–2018 | BMW | M6 | S63B44 4.4L V8; verify engine and measured clearances |
| 2011–2013, 2015–2018 | BMW | X5 xDrive50i | N63B44 4.4L V8; verify engine and measured clearances |
| 2015–2018 | BMW | X5 M | S63B44 4.4L V8; verify engine and measured clearances |
Vehicle fitment narrows the application but does not replace measurement. Match 5M1573HX-STD to the exact N63 or S63 engine version and the crankshaft, block, bearing position, and oil-clearance requirements of the build.
Specifications
| Detail | Value |
|---|---|
| Brand | ACL |
| Manufacturer Part Number | 5M1573HX-STD |
| Product Type | Crankshaft main-bearing set |
| Series | Race Series |
| Engine Applications | BMW N63B44 and S63B44 4395 cc V8 |
| Size | Standard |
| Clearance | HX extra-clearance configuration |
| Positions 1, 2, 4, 5 | 1573HX upper/lower; 64.961–64.980 mm shaft; 2.487 mm maximum wall; 22.25 mm maximum length |
| Position 3 | 1574HX(F) upper/lower; 64.971–64.990 mm shaft; 2.487 mm maximum wall; 27.95 mm maximum length |
| Standard Housing Bore | 70.000–70.019 mm |
| Material Code | F780 |
| GTIN | 9315726470237 |
| Country of Manufacture | Australia |
What’s Included
- One ACL Race Series 5M1573HX-STD five-main bearing set
- Upper and lower shells for the cataloged main-bearing positions
- Manufacturer packaging
Rod bearings, seals, fasteners, assembly lubricant, machine work, and installation tools are not included unless specifically shown as part of the manufacturer package.
About ACL
ACL develops replacement and Race Series engine bearings for performance and motorsport applications. Its Race Series range combines application-specific geometry, bearing materials, and controlled wall thicknesses for engine builders who select bearings by complete part number and measured assembly requirements.
Related Parts
- ACL BMW N63/S63 HX standard-size rod-bearing set for a matching extra-clearance rod-bearing configuration
- ACL BMW N63/S63 H standard-size rod-bearing set for builds requiring the standard H configuration
- ACL BMW N63/S63 H standard-size main-bearing set as the standard-clearance alternative
Frequently Asked Questions
What is the 5M1573HX-STD?
It is an ACL Race Series standard-size crankshaft main-bearing set for cataloged BMW N63B44 and S63B44 4.4-liter V8 applications.
What does HX mean on this ACL bearing set?
HX identifies the extra-clearance version. ACL specifies approximately 0.001 inch, or 0.025 mm, more oil clearance than the corresponding H-STD set when used on the specified standard-size shaft.
Is HX the same as an undersize or repair-size bearing?
No. HX changes the bearing-wall configuration for additional oil clearance. A repair-size suffix describes a separate crankshaft-journal requirement.
Can I select this bearing set from the vehicle year alone?
No. Confirm the exact engine code, crankshaft journal dimensions, housing bore, bearing positions, and required assembled clearance.
Does this set fit both N63 and S63 engines?
It is cataloged for N63B44 and S63B44 4395 cc V8 applications, but engine revisions and prior machine work must be verified before installation.
Are rod bearings included?
No. This listing is for the crankshaft main-bearing set. Rod bearings and other supporting engine components are sold separately.
Should the crankshaft be measured before ordering?
Yes. A qualified engine builder should measure every journal, housing bore, and assembled clearance before selecting or installing bearings.
Can this bearing set be installed without professional measuring tools?
No. Correct bearing selection and installation require calibrated measuring equipment, the applicable BMW service information, and the engine builder’s target clearances.
Installation Instructions
- Confirm 5M1573HX-STD, the engine code, and the required bearing configuration before disassembly or machining.
- Have a qualified engine builder inspect and measure the crankshaft journals and main-bearing housing bores.
- Compare the measured dimensions with ACL’s published ranges and the builder’s target oil clearances.
- Clean the block, caps, oil passages, and bearing seats without altering the bearing surfaces.
- Install each shell in its correct position and verify tang location, oil-hole alignment, groove placement, and crankshaft-fillet clearance.
- Measure assembled oil clearance and crankshaft endplay before final assembly. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.
- Apply the specified assembly lubricant, follow BMW’s torque sequence and fastener requirements, and confirm smooth crankshaft rotation.
- Prime the lubrication system and verify oil pressure before the first startup.
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