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Tag: Failure

3126

3116 and 3126 Truck Engines Failures Oil Quality

Posted on July 29, 2017 by sam

Varnished oil can accumulate on the valve stem near the bottom of the valve guides’ contact. This accumulation of varnish is similar to the happenings…

3126

3116 and 3126 Truck Engines Failures High Temperature

Posted on July 29, 2017 by sam

Valves for engines that operate in an overheated system will typically have a narrow band of oil coking near the bottom area of the valve…

3126

3116 and 3126 Truck Engines Failures Piston Contact

Posted on July 29, 2017 by sam

Multiple cylinders displayed outlines of the piston crown and the piston crater on the valve heads. This intermittent contact indicated a valve to a piston…

3126

3116 and 3126 Truck Engines Failures Tight Lash

Posted on July 27, 2017 by sam

Valves may not display oil degradation, adhesive wear, or fretting if valve lash was too tight. Also if valve lash was too tight valve heads…

3126

3116 and 3126 Truck Engines Failures Fretting

Posted on July 27, 2017 by sam

Fretting indicates repeated movement in a tight joint. Movement should not occur in the retaining area of the valve. Typically fretting is a result of…

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