DLP Unit 2: Upper Engine Disassembly and Diagnosis
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Key point: The three types of camshaft drives are:
Chain: Timing chains are used in most in‑block cam engines and lubricated with engine oil. Belt: The timing belt requires no lubrication. Gear: The camshaft gear is larger than the crankshaft gear.
Key points: The camshaft gear is larger than the crankshaft gear. Timing chains are used in most in‑block cam engines and lubricated with engine oil. The timing belt requires no lubrication.
Key points: Service timing belts at regular intervals. Replace chains and gears when worn.
Key points: A bluish discoloration on the journal indicates a lack of lubrication. If this occurs, inspect the corresponding camshaft bearing and oil feed hole for blockage. Inspect camshaft lobes for irregular wear patterns, scratches, gouges, and pitting.