1677348 Shim for Volvo VHD D12 Engines

What does a valve adjusting shim do?

This valve adjusting shim is a precision-ground component designed to bring valve clearance in heavy commercial vehicle diesel engines to the exact tolerance required by the manufacturer. By being fitted between the rocker arm, valve bridge, or cam follower and the valve, it maintains the necessary gap to ensure the valve seats fully on every cycle. Using high-strength components ensures long-term stability under high-pressure engine operation.

Compatible vehicles and engines

This specific 2.95 mm shim is compatible with Volvo VHD engines, specifically the D12 series. It serves as a critical part of the engine valve train, helping to maintain precise mechanical timing and combustion efficiency. It is also fitted to other heavy commercial vehicle engines within the same series where this exact thickness is required.

Installation and maintenance

For correct installation, technicians should verify that the shim diameter and thickness match the requirements of the cylinder head assembly. It is essential to check for any surface irregularities or uneven wear on the rocker arm or cam follower before installation. Maintaining correct clearance prevents compression loss and protects the valve seating face from premature wear.

Troubleshooting and selection

If engine noise increases or compression drops, inspecting the shim thickness is a recommended troubleshooting step. Proper selection of these shims ensures that the mechanical timing remains within factory specifications throughout the service interval.

OE cross-reference

1300 05 020 (Valve Adjusting Shim Engine Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 1677348.