King Crankshaft Thrust Washer / Bearing Set – MX-5 MK1 / MK2 / MK2.5 1.6 & 1.8 • TW133AM

King Engine Bearings TW133AM Crankshaft Thrust Washer Set

Replacement King Engine Bearings crankshaft thrust washer set for Mazda MX-5 MK1 / NA, MK2 / NB and MK2.5 / NB-FL 1.6L B6 and 1.8L BP petrol engines (1989–2005), including compatible 1.8 VVT applications.

The King TW133AM is a standard-size crankshaft thrust washer set designed to control axial movement of the crankshaft within the engine block. Manufactured from aluminium-based bi-metal bearing material, the set provides a replacement solution for restoring the correct crankshaft thrust-bearing arrangement during engine maintenance and rebuilding.

Crankshaft thrust washers play an important role in controlling crankshaft end float. By supporting the crankshaft against axial loads, they help prevent excessive forward and backward crankshaft movement during engine operation.

Excessive thrust bearing wear can lead to increased crankshaft end float, unwanted movement within the rotating assembly and accelerated wear of related components. Replacing worn thrust washers is an important part of correcting excessive end float and ensuring the engine is rebuilt within the correct dimensional tolerances.

The TW133AM set belongs to King's AM Series, featuring aluminium-based bi-metal bearing construction designed for original-equipment replacement applications.

This product is particularly suitable for engine bottom-end rebuilding, crankshaft replacement, main bearing servicing and repairs involving worn or damaged crankshaft thrust surfaces.

Important – Main Bearing Set Sold Separately: This product contains the crankshaft thrust washers only. It does not include the main crankshaft bearing shells. For a complete crankshaft bearing replacement, the compatible King Racing MB5304XP Main Bearing Set is available separately from MazSpec.

Product features and specifications:

• Product type: Crankshaft thrust washer / thrust bearing set
• Primary use: Controlling crankshaft axial movement and end float
• Location / system: Engine crankshaft / main bearing assembly
• Product series: King AM – OE Replacement
• Construction: Aluminium-based bi-metal
• Material type: Lead-free aluminium bearing material
• Size: Standard (STD)
• Nominal standard wall thickness: 2.55mm
• Crankshaft thrust diameter range: 57.25–57.50mm
• Housing diameter range: 68.75–69.00mm
• Engine applications: Mazda B6 1.6L and BP 1.8L petrol engines
• Vehicle applications: Mazda MX-5 MK1 / NA, MK2 / NB and MK2.5 / NB-FL
• Quantity per engine: 1 matched pair for the specified arrangement
• Quantity supplied: 1 pair / 2 individual thrust washers
• Main crankshaft bearings: Not included
• Compatible main bearing family: King Racing MB5304XP
• Brand: King Engine Bearings
• Manufacturer Part No.: TW133AM
• EAN: 6115004115880

Common replacement reasons: Crankshaft thrust washers may require replacement when excessive crankshaft end float is detected, during crankshaft or main bearing replacement, following thrust surface wear or as part of a comprehensive engine bottom-end rebuild. Excessive axial movement should be investigated before fitting replacement components.

Fitment advice: Designed for the Mazda B6 and BP engine applications listed in the compatibility table. This is the standard-size TW133AM thrust washer set. Correct selection depends on the crankshaft thrust surface dimensions and the required crankshaft end float. King also manufactures alternative thrust washer thicknesses for suitably machined crankshafts; those are separate products.

Other items to consider: When replacing crankshaft thrust washers, you may also want to purchase the compatible King Racing MB5304XP main crankshaft bearing set, connecting rod bearings, crankshaft oil seals, engine gasket sets, sump sealing compound, an oil pump, engine oil, oil filter and suitable assembly lubricant.

Useful tools / consumables: Dial indicator with magnetic stand, precision measuring equipment, socket set, torque wrench, engine stand, clean engine assembly lubricant and suitable engine cleaning materials.

Difficulty guide: DIY Difficulty: Advanced. Replacement requires access to the crankshaft thrust bearing arrangement and accurate measurement of crankshaft end float. Correct thrust washer orientation, lubrication and crankshaft installation procedures are essential. Professional engine-building knowledge is recommended.

Why King Engine Bearings? King Engine Bearings specialises in precision-manufactured bearing components for original-equipment replacement, engine rebuilding and performance applications. Its AM Series uses aluminium-based bi-metal bearing construction to provide reliable replacement components for compatible engines. The TW133AM thrust washer set complements King's range of main and connecting rod bearings for Mazda B6 and BP engine rebuilds.

What's in the box: 1 × King Engine Bearings TW133AM Standard Crankshaft Thrust Washer Set, containing 2 individual thrust washers (1 pair). Main crankshaft bearing shells are NOT included and are sold separately.

Installation / service notes: Before installation, thoroughly inspect the crankshaft thrust faces and associated bearing housing surfaces for scoring, excessive wear or damage. Measure the crankshaft thrust arrangement and select the correct washer size. Clean all components thoroughly and install the thrust washers in the specified orientation, ensuring the bearing surfaces and lubrication grooves are positioned correctly. Lubricate the thrust surfaces during assembly and tighten all crankshaft bearing components using the engine manufacturer's procedures. Measure crankshaft end float with a dial indicator after assembly and confirm that the crankshaft rotates freely. Correct any excessive or insufficient end float before completing the engine rebuild. Prime the lubrication system before initial engine startup.