1677347 Volvo FM12 D12C 2.90 mm Shim

What does a valve adjusting shim do?

This precision-ground shim serves as a critical component within the engine valve train, ensuring that valve clearance remains within the manufacturer's specified tolerance. By acting as a spacer between the cam follower and the valve, it maintains the exact gap required for complete valve seating during every engine cycle, which is vital for maintaining compression and optimal combustion efficiency.

Compatible vehicles and engines

This specific part is designed for use in Volvo FM12 trucks equipped with D12C engines. It is essential for maintaining the performance of heavy commercial vehicle engines where clearance is set via calibrated shims rather than threaded nuts. The correct thickness ensures the engine operates without excessive noise or loss of power.

Installation and maintenance

For professional installation, ensure the shim seat is completely clean and lightly lubricated before assembly to prevent scoring upon first start-up. Technicians should measure each valve individually to ensure each cylinder receives the correct grade, as clearances may vary across different cylinders even within the same engine.

Troubleshooting and selection

Regular maintenance of the valve train is necessary to prevent premature wear on contact surfaces. If a shim shows signs of uneven wear or if valve clearance drifts out of specification, replacement with a high-strength component of the exact required thickness is recommended to maintain system integrity.

OE cross-reference

1300 05 019 (Valve Adjusting Shim Engine Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 1677347.