Waterboxer Con Rod Set - 1900cc + 2100cc Waterboxer Engines

This genuine Volkswagen connecting rod (con rod) set is a direct replacement for all 1.9 and 2.1 Waterboxer (WBX) engines originally fitted to VW Type 25 / T3 buses. Supplied as a complete matched set of four, these rods are ideal for engine rebuilds where reliability, balance, and factory correctness are essential.

Each rod is supplied with new small-end bushes already fitted, along with new stretch bolts, making this a ready-to-install solution for professional or high-quality DIY engine builds.

What this con rod set does (and why it matters)

Connecting rods transfer combustion force from the piston to the crankshaft. On high-mileage Waterboxer engines, original rods can suffer from:

• Worn small-end bushes

• Oval big-end housings

• Fatigue from long-term heat cycling

Replacing the con rods during a rebuild ensures:

• Correct piston movement and alignment

• Smooth power transfer to the crankshaft

• Reduced vibration and long-term engine durability

• Compatibility with new pistons, bearings, and crankshafts

Using Genuine VW rods maintains factory tolerances and balance—critical on Waterboxer engines that rely on precise geometry for longevity.

How it works

Each connecting rod links a piston to the crankshaft:

• The small end houses the gudgeon (wrist) pin via a replaceable bush

• The big end clamps around the crankshaft journal using stretch bolts

During operation, the rod converts the piston’s up-and-down motion into rotational movement at the crankshaft. Correct clearances and strength are vital to prevent bearing failure or engine damage.

Kit contents

Supplied as a complete engine set:

• 4 x Genuine VW connecting rods

• Small-end bushes pre-installed

• New stretch bolts included

Everything required to replace all four con rods on one Waterboxer engine.

Engine compatibility

Fits all petrol Waterboxer engines fitted to the VW Type 25 / T3:

1.9 WBX engine codes

• DF

• DG

• DH

• GW

• SP

• EY

2.1 WBX engine codes

• DJ

• SR

• MV

• SS

Applications:

• VW Type 25 / T3: 1983–1992

Helpful fitting notes

• Suitable for all cylinders, regardless of side.

• Always use the supplied new stretch bolts—old bolts must not be reused.

• Big-end bearings should be replaced and clearances checked during installation.

• Rods should be installed in the correct orientation as per factory specification.

Parts you may also need (recommended)

When replacing connecting rods, it’s strongly advised to also consider:

• Big-end bearing shells

• Crankshaft inspection or polishing

• Piston rings or piston & barrel sets

• Full engine gasket set

• Fresh oil and filter after rebuild