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Fig. 23: Timing Chain Alignment Diagram Callouts For Fig. 23 DIAGNOSTIC INFORMATION AND PROCEDURES DIAGNOSTIC STARTING POINT - ENGINE MECHANICAL Begin the system diagnosis by reviewing the Disassembled Views, Engine Component SYMPTOMS - ENGINE MECHANICAL Strategy Based Diagnostics 1. Perform A Diagnostic System Check in Engine Controls before using the symptom tables (if applicable). 2. Review the system operations in order to familiarize yourself with the system functions. Refer to Disassembled Views, Engine Component Description and Lubrication All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the engine. Inspect the easily accessible or visible system components for obvious damage or conditions Callout Component Name 1 Timing Marks 1 Timing Marks 1 Timing Marks
2007 Hummer H3 2007 ENGINE Engine Mechanical - 3.7L - H3
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