King MB787AM0.25 Main Bearing Set for 1981-1992 Toyota Supra/Cressida 7MGE/7MGTE

Vehicle Fitment

• 1981-1986 Toyota Celica Supra (5MGE, 2.8L I6 DOHC, RWD)
• 1981-1984 Toyota Cressida Luxury (5ME, 2.8L I6, RWD)
• 1985-1988 Toyota Cressida Luxury (5MGE, 2.8L I6 DOHC, RWD)
• 1989-1992 Toyota Cressida Luxury (7MGE, 3.0L I6 DOHC, RWD)
• 1986-1992 Toyota Supra Base (7MGE, 3.0L I6 DOHC, RWD)
• 1987-1992 Toyota Supra Turbo (7MGTE, 3.0L I6 DOHC Turbo, RWD)

Fitment Notes

• Requires crankshaft machined to +0.25mm undersize - measure journals before ordering
• Not compatible with standard (STD) crankshaft journal dimensions - order MB787AM for standard clearance applications
• For use with Toyota M-series I6 engines only: 5ME, 5MGE, 7MGE, and 7MGTE engine codes
• Does not fit Toyota Celica GT, Celica GTS, or Celica ST equipped with I4 engines (22R, 2S-E, 3S-GE)
• Does not fit Supra models equipped with the 1JZ or 2JZ engine family (1993+)

Features

• AM-Series Alecular silicon aluminum alloy bi-metal construction offers an optimal balance of strength and conformability for street and marine applications
• Superior embeddability allows macro-particles to embed harmlessly into the bearing surface rather than scoring or scratching crankshaft journals
• Lead-free composition ensures environmentally responsible, user-safe engine rebuilding without compromising bearing performance
• Precision tolerance control held to within ±0.0001" for consistent oil clearance and reliable crank-to-bearing fitment across the full set
• Premium steel backing provides structural rigidity and prevents bearing flex or movement within the housing bore during operation
• Engineered to prevent tearing or weakening of the bearing alloy layer under sustained load cycles typical of street-driven inline-six applications
• Specifically machined to accommodate Toyota M-series crankshafts that have been turned 0.25mm undersize during machine shop reconditioning
• Full-round precision forming ensures correct housing seat contact across the entire back surface, eliminating high spots and promoting uniform load distribution
• Manufactured by King Engine Bearings, a company specializing exclusively in engine bearings since 1960, supplying OEM and performance markets worldwide
• Available across multiple undersize options (STD, +0.25mm, +0.50mm, +0.75mm, +1.0mm) to support fully staged crankshaft grinding programs

Specifications

• Part Number: MB787AM0.25
• Series: AM-Series (Alecular silicon aluminum alloy, bi-metal)
• Undersize: +0.25mm crankshaft journal undersize
• Tolerance: ±0.0001" (±0.00254mm)
• Position: Crankshaft main journals
• Quantity: 7 pieces per set (full main journal set for Toyota M-series inline-6)
• Compatible Engine Codes: Toyota 5ME, 5MGE, 7MGE, 7MGTE
• Application Type: Street / Marine
• Backing Material: Steel
• Overlay Material: Alecular aluminum-silicon alloy (lead-free)

Included Components

• 7x Crankshaft main bearing shells (upper and lower halves, complete set of 7 journals)

Product Description

The King Engine Bearings MB787AM0.25 is a complete crankshaft main bearing set engineered for Toyota M-series inline-six engines that have undergone crankshaft reconditioning to a +0.25mm undersize. This set covers the 5ME, 5MGE, 7MGE, and 7MGTE engine families found in the 1981-1986 Toyota Celica Supra, 1981-1992 Toyota Cressida Luxury, and 1986-1992 Toyota Supra in both naturally aspirated and turbocharged configurations. The AM-Series designation identifies the Alecular silicon aluminum alloy construction - a bi-metal bearing design specifically developed for street and marine use, where durability over long service intervals is prioritized alongside strong load-bearing capacity.

King's AM-Series bearings are engineered with superior embeddability, meaning that hard particles - such as casting sand, metallic debris, or carbon - can embed into the soft bearing surface rather than being forced back against the crankshaft journal. This protects expensive reconditioned crankshafts from scratch damage and extends the service life of the rebuild. Tolerance control is held to an industry-leading ±0.0001", ensuring oil clearances are consistent across all seven main journals, which is critical for maintaining proper oil film pressure in the high-revving M-series engines. All AM-Series bearings from King are lead-free, making them safe to handle and environmentally compliant.

Before ordering, it is essential to have the crankshaft measured by a qualified machine shop to confirm the journal has been ground to the +0.25mm undersize. Using an incorrect bearing size - either too tight or too loose - will result in improper oil clearance and potential engine damage. King also offers this application in STD, +0.50mm, +0.75mm, and +1.0mm undersizes to accommodate varying degrees of crankshaft wear or grind. This set is designed exclusively for Toyota M-series I6 engines; it is not compatible with the 1JZ or 2JZ platforms found in post-1992 Supra models, nor with the I4-powered Celica variants (GT, GTS, ST) that used the 22R, 2S-E, or 3S-GE engine families.