VIDEO: Using the FCAR HD truck scanner on a 2017 Mack with Cummins engine

April 24, 2018

In this video, FCAR is are using FCAR HD truck scanner to diagnose a Mack truck.

In this video, FCAR is are using FCAR HD truck scanner to diagnose a Mack truck.

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The cylinder head was removed, and the valve train was inspected. Cylinder No. 3 exhaust valve had excessive stem-to-guide clearance. This allowed the No. 3 exhaust valve to rock along the seat and created an intermittent sealing issue. The cylinder head requires reconditioning and/or replacement. These cylinder heads are a known issue so replacement is prudent.

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Figure 1- All communication faults should begin with a vehicle-wide all-DTC scan. Often, scan results like this offer the common node(s) in which the non-faulted nodes are complaining about.

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