Noisy Valve Train Components
- Insufficient oil supply.
- Worn or bent push rods.
- Worn rocker arms, or bridged pivots.
- Dirt or chips in hydraulic valve lifters.
- Excessive valve lifter leak down.
- Valve lifter face worn.
- Broken or cocked valve springs.
- Excessive valve stem-to-guide clearance.
- Valve bent.
- Loose rocker arms.
- Excessive valve seat runout.
- Missing valve lock.
- Push rod rubbing or contacting cylinder head.
- Excessively worn camshaft lobes.
- Plugged valve lifter oil feed holes.
- Faulty valve lifter check ball.
- Rocker arm retaining nut installed upside down.
- Valve lifters incorrectly fitted to bore size.
- Faulty valve lifter plunger, or push rod seat.