Timing Chain Stretch and Guide Wear (SR20DET/SR20DE)
Symptoms
Rattling or clattering from the front of the engine, most pronounced on cold start. The noise may diminish when warm but persist at idle. In severe cases, the engine loses power, runs rough, or misfires.
Cause
The SR20 uses a timing chain (not a belt) driven from the crankshaft to the camshaft sprockets. Over time, particularly above 150,000 km, the chain stretches and the plastic chain guides wear down. The hydraulic chain tensioner compensates for some stretch, but eventually the chain becomes excessively loose. A severely stretched chain can jump a tooth on the camshaft sprocket, causing the valve timing to shift. In extreme cases, this leads to valve-to-piston contact and significant engine damage.
Fix
Replace the timing chain, chain guides, and chain tensioner as a set.
The job requires removing the front timing cover, which means removing the radiator, fan, and various accessories.
It is a full day's work for a competent mechanic.
Parts: $200-400 for a complete kit (chain, guides, tensioner, gaskets).
Labour: $400-600 at a workshop.
This is a DIY-friendly job for experienced home mechanics.
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