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ACL 7M1172HX-STD is a standard size with the extra-clearance configuration identified by the mpn crankshaft main bearing set for the listed Nissan 240Z 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 7M1172HX-STD for confident product matching
- Standard size with the extra-clearance configuration identified by the MPN 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 |
|---|---|---|---|
| 1970-1973 | Nissan | 240Z | Verify engine and crankshaft configuration |
| 1974-1975 | Nissan | 260Z | Verify engine and crankshaft configuration |
| 1975-1978 | Nissan | 280Z | Verify engine and crankshaft configuration |
| 1979-1983 | Nissan | 280ZX | Verify engine and crankshaft configuration |
| 1977-1981 | Nissan | 810 | Verify engine and crankshaft configuration |
| 1981-1984 | Nissan | Maxima | 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 | 7M1172HX-STD |
| Component | Crankshaft Main Bearing Set |
| Size / Clearance | Standard size with the extra-clearance configuration identified by the MPN |
| 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.
Related Parts
- ACL Nissan VR38DETT 3799cc V6 DOHC 4V Twin Turbo Standard Size High Performance Main Bearing Set
- ACL GTR Standard Sized High Performance Main Bearing Set (Version 1 Block)
- Shop the complete ACL engine bearing and oil-pump collection
Frequently Asked Questions
What is ACL part 7M1172HX-STD?
It is the crankshaft main bearing set described on this page in the exact standard size with the extra-clearance configuration identified by the mpn 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 7M1172HX-STD, 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.
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