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King Engine Bearings MB4012AM is the exact main bearings set shown in this listing. Select it by engine application, bearing position, measured crankshaft journal and housing bore, size designation, material or coating, and manufacturer part number. Engine machining measurements must be confirmed before ordering.
Key Features
- Bimetal Aluminum Construction: Provides strong wear resistance and thermal stability for extended engine life under load.
- Enhanced Oil Clearance: Optimized design promotes better lubrication during high RPM operation.
- Direct OEM Replacement: Matches factory specs while supporting performance upgrades.
- Lightweight Design: Reduces rotational mass for quicker engine response.
- Bimetal construction features an aluminum base with overlay for superior strength and heat dissipation.
- Engineered tolerances support high horsepower builds.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 1990-1991 | Lexus | ES250 | Confirm engine code, displacement, journal size, bearing position, and machining specification |
| 1992-1993 | Lexus | ES300 | Confirm engine code, displacement, journal size, bearing position, and machining specification |
| 1988-2002 | Toyota | 4Runner | Confirm engine code, displacement, journal size, bearing position, and machining specification |
| 1988-1993 | Toyota | Camry | Confirm engine code, displacement, journal size, bearing position, and machining specification |
| 1988-1995 | Toyota | Pickup | Confirm engine code, displacement, journal size, bearing position, and machining specification |
| 1993-1998 | Toyota | T100 | Confirm engine code, displacement, journal size, bearing position, and machining specification |
| 1995-2004 | Toyota | Tacoma | Confirm engine code, displacement, journal size, bearing position, and machining specification |
| 2000-2004 | Toyota | Tundra | Confirm engine code, displacement, journal size, bearing position, and machining specification |
Specifications
| Brand | King Engine Bearings |
|---|---|
| Manufacturer Part Number | MB4012AM |
| Bearing Type | Main Bearings |
| Size | Confirm exact part-number suffix and measured journal dimensions |
| Finish or Coating | Bearing construction identified by exact part number |
| Condition | New |
What's Included
One new King Engine Bearings main bearings set in the exact size and configuration identified by part number MB4012AM. Gaskets, fasteners, assembly lubricant, measuring tools, and machine work are not included unless expressly listed.
About King Engine Bearings
King has specialized in engine bearings since 1960 and produces OE replacement and performance main, connecting rod, camshaft, and thrust bearing solutions. Correct selection depends on exact engine application, journal and housing measurements, material, coating, clearance target, and part-number suffix.
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Frequently Asked Questions
Will King Engine Bearings MB4012AM fit my engine?
Match the listed year, make, and model where available, then confirm the exact engine code, displacement, crankshaft journal dimensions, housing bore, bearing position, thrust location, and part-number suffix.
Does King Engine Bearings MB4012AM fit a standard-size crankshaft?
The listed size designation is Confirm exact part-number suffix and measured journal dimensions. Do not assume standard size from the vehicle application. Measure every journal and compare the finished crankshaft dimensions with the exact bearing specification before ordering.
How should bearing clearance be checked for King MB4012AM?
Have a qualified engine builder measure the housing bore and each crankshaft journal with calibrated tools, install the dry bearing shells in their correct positions, torque the caps to specification, and verify oil clearance against the engine and bearing requirements.
Installation Instructions
Installation requires qualified engine-machining and assembly practices. Identify every cap and bearing position, inspect and measure housing bores and crankshaft journals, verify surface finish and thrust clearance, clean all oil passages, install each shell without contamination or damage, align oil holes and locating features, lubricate as specified, torque fasteners in the correct sequence, verify oil clearance and crankshaft rotation, then prime the lubrication system before initial startup.
King Engine Bearings
Shop King Engine Bearings main, connecting rod, camshaft, and thrust bearing sets by exact manufacturer part number, engine application, size designation, material, and coating. King Main and Rod Bearing Applications King produces OE replacement and performance bearing solutions for domestic, European, and import gasoline and diesel engines. Correct selection depends on the exact engine code, bearing position, measured crankshaft journal and housing bore, thrust location, clearance target, and part-number suffix. Choosing the Correct King Engine Bearings Product Match the exact King manufacturer part number and suffix Confirm year, make, model, engine code, displacement, and bearing position Measure every crankshaft journal and housing bore with calibrated tools Choose standard, undersize, oversize, or extra-clearance bearings from measured dimensions Confirm material, coating, oil-clearance target, and intended engine use Verify thrust-bearing location, oil-hole alignment, and re...
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