568688G - Inlet Valve Guide – Diesel

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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.

Inlet Valve Guide for the diesel cylinder head, part of the valve train.

Pressed into the cylinder head, the guide locates the inlet valve stem and keeps the valve concentric with its seat throughout the cycle, while conducting heat away from the stem into the head casting. A worn guide lets the valve rock in its bore, leading to oil consumption past the stem seal and poor seat sealing. Guides are renewed and reamed to the correct stem clearance during a cylinder head overhaul. Fitted to naturally aspirated and turbocharged diesel engines.

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

Fitment Notes DEFENDER 1986-2006 — 2.5 Diesel NA, 2.5 Turbo Diesel
SERIES II/IIA & III — Diesel only

Alternative Codes

568688G568688605482BR 3386STC1048

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Frequently asked questions

What is the inlet valve guide and what does it do?

The inlet valve guide is pressed into the diesel cylinder head and locates the inlet valve stem, keeping the valve concentric with its seat through every cycle. It also carries heat from the valve stem into the head casting. It's part of the valve train on the 2.5 diesel and Series diesel engines.

How many valve guides are needed, and when are they replaced?

Valve guides are typically renewed as a full set during a cylinder head overhaul, not singly, since all guides wear at a similar rate. New guides are pressed in and then reamed to the correct stem clearance. Order enough to cover every inlet position on your head.

Why do inlet valve guides wear out?

Inlet valve guides wear because the valve stem constantly slides in the bore under heat and side load. A worn guide lets the valve rock, which draws oil past the stem seal and stops the valve sealing on its seat. Typical signs are oil smoke and lost compression.

Does this guide fit both naturally aspirated and turbo diesel engines?

This inlet valve guide fits the 2.5 naturally aspirated and 2.5 turbo diesel engines in the Defender up to 2006 and the diesel Series 2, 2A and 3. It's an OEM part. Check your head casting when overhauling, as guides are reamed to suit the valve stem on assembly.