Timing chains are designed to last much longer than timing belts, but they are not maintenance free. A brief rattle on a cold start, a check engine light for camshaft and crankshaft correlation, or a persistent noise from the front of the engine are common signs that the timing system needs attention.
What Causes Timing Chain Noise
- Chain elongation: wear at the pins and links makes the chain effectively longer, leaving slack that the tensioner can no longer take up.
- Worn or broken guides: plastic guide faces wear down or crack with age and heat. Broken pieces can end up in the oil pan and restrict the oil pickup.
- Tensioner problems: many tensioners are hydraulic and rely on engine oil pressure. Low oil level, sludge or a weak tensioner can allow slack, especially right after startup.
- Oil maintenance: extended oil change intervals and the wrong oil viscosity accelerate chain and guide wear.
Diagnosis
Many modern engines report timing correlation codes when the chain has stretched enough to shift camshaft timing. Scan tool data comparing camshaft and crankshaft position can help confirm this before the engine is disassembled. Always check oil level and condition first, because low oil pressure can cause similar symptoms.
Replace the Timing System as a Set
Installing a new chain on worn sprockets, or new guides with an old chain, usually leads to a short-lived repair. A complete timing chain kit allows the chain, guides, tensioner and gears to be replaced together. Depending on the engine, the water pump, front cover gasket and seals are often replaced during the same job.
Installation Tips
- Follow the timing marks and any special tools or camshaft locking procedures for the engine.
- Inspect the oil pan and pickup screen for broken guide material.
- Prime or reset the tensioner as directed, and rotate the engine by hand to confirm timing before startup.
- Refill with the specified oil grade and recommend regular oil changes.
Evergreen Timing Chain Components
Evergreen supplies timing chain components, including timing chain kits, kits with a water pump, tensioners, gears and covers. Look up the correct kit in the Evergreen eCatalog.
