506817 - Tappet Adjuster

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OEM: Made by an Original Equipment Manufacturer. This part is made by an original equipment manufacturer or under their license, ensuring compatibility and quality.

Tappet Adjuster is the adjustment screw used to set valve clearance in the cylinder head of Land Rover Series 4-cylinder engines.

The screw threads into the rocker arm and is secured by its lock nut once the correct tappet clearance is established, maintaining accurate valve timing across the operating temperature range.

Vehicle Model Land Rover Defender up to 2016
Land Rover Series 2 and 3

Fitment Notes Fitment data limited — derived from web research, verify if uncertain
SERIES 2, 2A & 3 (88 & 109) — tappet adjusting screw, 2.25L petrol/diesel engine, valve train

Alternative Codes

506817STC1117

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Frequently asked questions

What does the tappet adjuster do?

The tappet adjuster is the screw that sets valve clearance in the cylinder head. It threads into the rocker arm and is locked by its lock nut once the correct clearance is set. It's used on the Land Rover Series 2.25L 4-cylinder petrol and diesel engines.

Which Land Rover engines use this tappet adjuster?

This tappet adjuster fits the Land Rover Series II, IIA and III (88 and 109 inch) with the 2.25L petrol or diesel engine. It's a valvetrain part, so confirm your engine is the 2.25L 4-cylinder before ordering, as other engines use different valve adjustment components.

How is the tappet adjuster set and locked?

The tappet adjuster screws into the rocker arm and is turned to set the valve clearance, then held by its lock nut so it can't move. Set the clearance to your workshop manual specification with the engine in the right position. It's a job most home mechanics can do with basic tools and feeler gauges.