Engine Noise or Engine Misfire Condition

Some 2017-2018 Silverado HD, Sierra HD, Express, Savana and Low Cab Forward models equipped with a 6.0L V8 engine (RPOs L96, LC8) (Fig. 10) may have an engine noise or misfire condition caused by a broken rocker arm.

 

Fig 10

 

If there is excessive engine noise or an engine misfire, inspect for possible broken rocker arms. (Fig. 11) A broken rocker arm could result in a valve dropping to the cylinder, causing catastrophic engine failure, which would require engine replacement due to cylinder head and block damage.

 

Fig 11

 

If a broken rocker arm is found, check to see if the valve dropped into the cylinder. If the valve has dropped, the engine will need to be replaced. If the valve has not dropped, reinstall any valve keepers and replace all the intake rocker arms.

 

In the 6.0L V8 engine, motion is transmitted from the camshaft through the hydraulic roller valve lifters and tubular pushrods to the roller type rocker arms. The nylon valve lifter guides position and retain the valve lifters. The valve rocker arms for each bank of cylinders are mounted on pedestals or pivot supports. Each rocker arm is retained on the pivot support and cylinder head by a bolt.

 

– Thanks to Richard Renshaw

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