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ACL 4M2737H-.025 is a .025 size suffix crankshaft main bearing set for the listed INFINITI J30 engine applications. It is intended for measured engine assembly where journal diameter, housing bore, oil clearance, bearing position, and every MPN suffix are confirmed before installation.
Key Features
- Exact ACL manufacturer part number 4M2737H-.025 for confident product matching
- .025 size suffix configuration
- Purpose-built crankshaft main bearing set for measured engine assembly
- New aftermarket engine component; final clearance is determined by measurement
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 1993-1997 | INFINITI | J30 | Verify engine and crankshaft configuration |
| 1990-1992 | INFINITI | M30 | Verify engine and crankshaft configuration |
| 1997-2000 | INFINITI | QX4 | Verify engine and crankshaft configuration |
| 1987-1988 | Nissan | 200SX | Verify engine and crankshaft configuration |
| 1984-1996 | Nissan | 300ZX | Verify engine and crankshaft configuration |
| 1990-1994 | Nissan | D21 | Verify engine and crankshaft configuration |
| 1999-2004 | Nissan | Frontier | Verify engine and crankshaft configuration |
| 1985-1994 | Nissan | Maxima | Verify engine and crankshaft configuration |
| 1987-2000 | Nissan | Pathfinder | Verify engine and crankshaft configuration |
| 1995 | Nissan | Pickup | Verify engine and crankshaft configuration |
| 1993-2002 | Nissan | Quest | Verify engine and crankshaft configuration |
| 2000-2004 | Nissan | Xterra | Verify engine and crankshaft configuration |
Vehicle fitment is a starting point only. Engine swaps, machining, crankshaft changes, previous repairs, and production variations can change the required bearing or pump configuration.
Specifications
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 4M2737H-.025 |
| Component | Crankshaft Main Bearing Set |
| Size / Clearance | .025 size suffix |
| Condition | New |
What's Included
The exact ACL component set and package quantity identified by the product title and MPN. Order the number of packages stated in the title when a listing is sold by pair or partial set.
About ACL
ACL manufactures engine bearings and lubrication components for replacement, performance, and motorsport engine builds. Black Ops Auto Works organizes the catalog by exact MPN, engine application, component position, and size suffix so builders can compare the correct configuration.
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Frequently Asked Questions
What is ACL part 4M2737H-.025?
It is the crankshaft main bearing set described on this page in the exact .025 size suffix configuration.
Does vehicle fitment alone confirm the correct bearing?
No. Match the exact MPN, engine code, crankshaft version, journal dimensions, and every size or clearance suffix.
What does STD mean?
STD identifies a standard-size configuration. The crankshaft and housing must still be measured before assembly.
What does an HX or clearance suffix mean?
It identifies an MPN-specific clearance configuration. Never substitute it without measured assembly requirements.
Can bearings be installed without measuring oil clearance?
No. A qualified engine builder should measure every journal, housing bore, and assembled oil clearance with calibrated tools.
Are related bearings or thrust washers included?
Only the components and quantity stated for this exact MPN are included. Main, rod, cam, and thrust components may be sold separately.
Is this product new?
Yes. The condition is new unless the product page explicitly states otherwise.
What should I verify before checkout?
Confirm the MPN, engine application, journal size, required clearance, package quantity, coating or series suffix, and all machine-shop measurements.
Installation Instructions
- Confirm ACL part 4M2737H-.025, the engine code, crankshaft version, journal position, and required size before disassembly.
- Have a qualified engine machinist inspect the crankshaft and housing, then measure every journal and bore with calibrated tools.
- Clean all oil passages and bearing seats; never install over debris, burrs, damage, or an unverified machined surface.
- Check bearing orientation, oil-hole alignment, crush, side clearance, and assembled oil clearance using the engine-builder procedure.
- Use the specified lubricant, fastener procedure, and torque sequence, then verify free rotation and oil-system priming before startup.
- Monitor oil pressure and inspect for abnormal noise or contamination during initial operation and break-in.
ACL
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