Click to zoom in
ACL 5M8309HXO/S2-STD is a main bearing set for the cataloged Subaru EJ18E, EJ205, EJ20D, EJ20E engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.
Bearing Configuration
HX specifies 0.001 inch (0.025 mm) additional oil clearance relative to the corresponding H-STD set on the specified standard-size shaft. It is separate from any repair-size or housing-oversize designation.
0.002 inch oversize housing configuration. Keep the housing-oversize requirement separate from the crankshaft size suffix.
For the cataloged Subaru configuration with the thrust bearing in position five. Verify the block and thrust arrangement before ordering.
Engine Application
| Manufacturer / Engine | Subaru — EJ18E |
|---|---|
| Manufacturer / Engine | Subaru — EJ205 |
| Manufacturer / Engine | Subaru — EJ20D |
| Manufacturer / Engine | Subaru — EJ20E |
| Manufacturer / Engine | Subaru — EJ20G |
| Manufacturer / Engine | Subaru — EJ20T |
| Manufacturer / Engine | Subaru — EJ20TT |
| Manufacturer / Engine | Subaru — EJ22E |
| Manufacturer / Engine | Subaru — EJ22EZ |
| Manufacturer / Engine | Subaru — EJ22G |
| Manufacturer / Engine | Subaru — EJ22T |
| Manufacturer / Engine | Subaru — EJ251 |
| Manufacturer / Engine | Subaru — EJ25D |
| Manufacturer / Engine | Subaru — EJ25T |
The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.
Specifications
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 5M8309HXO/S2-STD |
| Component | Main Bearing Set |
| Size Selection | STD manufacturer size designation; verify the exact engine and assembled clearance. |
| Catalog Housing Bore (STD journal) | 64.051–64.071 mm |
| Catalog Shaft Diameter (STD) | 59.984–60.000 mm |
| Catalog Family | ACL Race Series |
| Half Type | Identical halves |
| Catalog Size Options | STD |
Quantity and Assembly Checks
Confirm the set contents, bearing positions and any separate thrust components against the complete manufacturer number. The photo is representative of the part family.
Measure shaft journals, housing bores and assembled oil clearance using the engine builder’s specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size.
Frequently Asked Questions
Is the year and model enough to choose this bearing? No. Match 5M8309HXO/S2-STD to the exact engine and measured build specification.
What size is this listing? STD manufacturer size designation; verify the exact engine and assembled clearance.
Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.
Related Engine Parts
ACL Performance Parts
Shop ACL engine bearings, Race Series rod and main bearings, thrust components, bushings and selected oil pumps at Black Ops Auto Works. Build your parts list around the engine you are rebuilding, then compare Race Series H, extra-clearance HX and the available repair-size configurations with your engine builder’s requirements.ACL Race Series Engine BearingsACL Race Series bearings give engine builders application-specific choices for performance engine assembly. H and HX configurations let you select the specified bearing family and oil-clearance option, with additional designs available for selected engines. The right choice starts with the planned engine build and the measured components rather than a universal bearing upgrade.Shop ACL Engine Parts Connecting-rod bearings: service the crankshaft’s rod journals with the set or individual pair specified for your engine. Main bearings: support the crankshaft in the block; compare complete sets and selective-grade listings where of...
View ACL Performance Parts Products
Bearings
Shop engine bearings, drivetrain bearing kits and specialty spherical bearings at Black Ops Auto Works. Compare ACL and Clevite rod, main, cam and thrust components with Yukon or USA Standard axle and gearbox service parts, plus QA1 bearing components. Choose the assembly being built or repaired first, then select the exact bearing specification with the builder’s measured dimensions.ACL and Clevite Engine Bearing ChoicesThe engine selection includes ACL Race Series and Clevite applications for domestic and import builds. Rod bearings, main bearings, cam bearings and thrust washers have different positions and functions. Compare the exact engine family and the required component rather than assuming one engine-bearing set covers the entire short block.Choose the manufacturer’s material, series and size for the actual build specification. Broad rules that label every bi-metal bearing a racing upgrade or every tri-metal bearing a mild-street part are not a sound substitute for the app...
View Bearings Products
Engine
Shop automotive engine parts, cooling-system components, oil-system upgrades, ignition parts, pulleys, sensors, gaskets, fuel components, and engine-bay accessories at Black Ops Auto Works. This collection covers vehicle-specific replacement parts, performance upgrades, supporting hardware, and universal components for street cars, trucks, SUVs, Jeeps, diesel vehicles, off-road builds, and motorsport applications. Engine Parts and Performance Components The Engine collection brings together components used throughout the engine, lubrication system, cooling system, ignition system, fuel system, crankcase ventilation, accessory drive, and engine compartment. Available products range from replacement sensors and gaskets to rotating-assembly parts, performance cooling systems, supercharger pulleys, catch cans, cylinder heads, camshafts, intake manifolds, and engine-bay dress-up components. Engine compatibility cannot be determined from vehicle model alone. Confirm the exact year, make, ...
View Engine Products
Engine Block
Shop engine bearings, gaskets, engine mounts, sealing components and engine-bay accessories at Black Ops Auto Works. Compare ACL and Clevite bearing references with Cometic/MAHLE sealing parts, Innovative and other mount choices, and listed covers or service fittings. Choose the specific repair or build scope before completing a parts order.Main and Rod Bearings: Measure the AssemblyMatch the bearing to the engine family, journal position and exact size designation. ACL references distinguish standard, journal-undersize, extra-clearance and housing-oversize configurations. These descriptions address different dimensions; one is not a universal substitute for another.Establish running clearance from the measured crankshaft and assembled housing/bearing with the correct tools and builder specifications. Load, oil viscosity, temperature, alignment and journal condition all matter. Neither a horsepower threshold nor a bearing brand establishes a universal tighter-clearance target.Gasket...
View Engine Block Products