Timing chain guides and rails

How you know it is this

• Plastic fragments in the sump or caught in the oil strainer
• A rattle that no new tensioner cures
• A chain that has worn a groove right through a rail, found when the cover is off

Worth knowing before you buy

• The plastic goes brittle with heat and age, and it is usually the guide that fails rather than the chain.
• Broken pieces end up in the sump and can block the oil pick-up, which turns a timing job into an engine.
• Always with the chain and tensioner as a set.

Rest of the timing

• Timing chains
• Timing chain tensioners
• Timing belts and kits
• Camshaft adjusters (phase variators)
• Camshaft adjuster magnets / solenoids
• Timing covers and gaskets