Waterboxer Crankshaft Main Bearing Set - 1983-85 - 1 Piece Thrust

These replacement crankshaft main bearing set are designed for early Waterboxer engines fitted to VW Type 25 / T3 buses from 1983 to 1985 that use the one-piece thrust bearing design. Supplied as a complete set of four bearings, it is suitable for engine rebuilds where maintaining correct crankshaft alignment and end-float is essential.

These bearings are specific to early WBX engines with a single-piece thrust bearing. Later engines use a different thrust arrangement.

What this bearing set does (and why it matters)

Main bearings support the crankshaft within the engine case, allowing it to rotate smoothly while maintaining precise alignment. The thrust bearing controls crankshaft end-float, preventing excessive forward and backward movement caused by clutch operation and engine load.

Worn or incorrect bearings can lead to:

• Low oil pressure

• Crankshaft movement and end-float issues

• Premature engine wear or failure

Replacing main bearings during a rebuild restores proper oil clearance, crankshaft stability, and long-term reliability.

How it works

The crankshaft runs on a thin film of pressurised oil between the journals and the bearing surfaces. The one-piece thrust bearing (the bearing with collars, located nearest the flywheel) absorbs axial loads from the clutch and drivetrain, while the remaining bearings support radial loads along the crankshaft.

Correct sizing is critical—this is why all reference measurements are taken from the thrust bearing with collars.

Bearing measurements (standard size)

If measuring your existing bearings to confirm fitment, use the main thrust bearing for reference.

Standard dimensions:

• Crankshaft journal (ID): 55mm

• Crankcase bore (OD): 65mm

• Thrust width: 21mm (distance between thrust faces on the flywheel-side bearing)

Kit contents

• Complete main bearing set for one engine

• 4 bearings total, including one-piece thrust bearing

• Quantity: 1 set per engine

Engine compatibility

Fits early Waterboxer engines with one-piece thrust bearing:

Engine codes

• DF – 1.9

• DG – 1.9

• DH – 1.9

• GW – 1.9

Applications

• VW Type 25 / T3: 1983–1985

Not suitable for later WBX engines with split thrust bearings.

Helpful fitting notes

• Always measure crankshaft journals and crankcase bores before ordering.

• Check crankshaft end-float during assembly.

• Use assembly lube on installation and prime the oil system before first start.

Parts you may also need (recommended)

When replacing main bearings, it’s good practice to also consider:

• Big-end bearing shells

• Crankshaft inspection / polishing

• Full engine gasket set

• New oil pump or oil pump seals

• Fresh oil and filter for initial start-up