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It all depends on what KIND of knocking sound.
Some people call it a knocking sound when the engine pings from pre-ignition. If that's what you have, check the knock sensor.
A classic knocking sound is typically either worn bearings or piston slap.
- Piston slap is when there the skirt of the piston is a little small and it "pops" at the bottom of the stroke. Typically that sound goes away once the engine warms up. The small block 350 is notorious for a little piston slap and as long as it goes away once the engine is warmed up piston slap is considered to be in the nuisance category of engine sounds.
- If it's worn bearings you'll also see some kind of indication of low oil pressure. If THAT'S going on, the engine is "done". You can try a heavier weight oil but if it's knocking constantly that probably won't do much good.
Thank You for that Answer about the Bearings and Crankshaft
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∙ 14y ago
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