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The KING MB5527AM is an unflanged main bearing set engineered for Toyota 4A-series and 7A-FE engines, with additional fitment for the Geely MR479QA. Main bearings form the load surface between each crankshaft main journal and the engine block, maintaining oil clearance and supporting the rotating crankshaft assembly.
| Detail | Value |
|---|---|
| Brand | KING |
| Part Number | MB5527AM |
| Component | Main Bearing Set, Unflanged |
| Oil Groove | Grooved upper shells only |
| Lug Configuration | 5 left lug + 5 right lug |
| Sold Configuration | Customer specifies oversize at order (STD / 0.25 / 0.50 / 0.75 / 1.00 / 1.50) |
| Dimension | Value |
|---|---|
| Housing Size (Max) | 52.045 mm |
| Housing Size (Min) | 52.019 mm |
| Shaft Size (Max) | 48.001 mm |
| Shaft Size (Min) | 47.981 mm |
| Thickness | 2.004 mm |
| Width | 19.860 mm |
| Available Sizes | STD, 0.25, 0.50, 0.75, 1.00, 1.50 |
| Make | Model | Engine | kW | Years |
|---|---|---|---|---|
| Geely | CK1 1.5i | MR479QA | Not specified | 2007-2009 |
| Toyota | Conquest 1600 | 4A-L | 81 | 1985-1988 |
| Toyota | Conquest 1600 LS | 4A-F | 81 | 1988-1993 |
| Toyota | Conquest 1600 RS | 4A-GE | 81 | 1986-1988 |
| Toyota | Conquest 180i | 7A-FE | 81 | 1993-1996 |
| Toyota | Corolla 1600 | 4A-GE | 81 | 1986-1988 |
| Toyota | Corolla Avante G | 4A-L | 81 | 1986-1988 |
| Toyota | Corolla 1.6 GL G | 4A-F | 81 | 1988-1993 |
| Toyota | Corolla 160i | 4A-FE | 81 | 1994-1997 |
| Toyota | Corolla 180i | 7A-FE | 81 | 1993-1996 |
| Toyota | Corolla 180i GLE | 7A-FE | 81 | 1996-2002 |
| Toyota | Corolla 1.6 RSi | 4A-GE | 81 | 1997-2002 |
| Toyota | Tazz 160i | 4A-FE | 81 | 2001-2003 |
Main bearings are critical engine internal components. Correct selection of size, verification of crankshaft journal condition and oil clearance, and proper installation are essential for engine reliability. These bearings should only be fitted by a qualified engine builder or motor mechanic. Always inspect the crankshaft main journals, verify clearances with plastigauge, and follow the engine manufacturer's torque specification for the main cap bolts.
How do I know which oversize to order?
The oversize required depends on the condition of your crankshaft main journals. After regrinding, your engine builder or machinist will measure the journals and spec
