162fmj Engine Service Manual Link -

Align the "T" mark on the flywheel with the stationary index mark. The manual provides a clear photo—if you align the "F" mark, your ignition timing will be off. On the 162FMJ, both valves should be loose at TDC of the compression stroke.

Giving a benchmark for diagnostic testing to determine the health of piston rings and cylinder walls. Diagnostic and Maintenance Procedures 162fmj Engine Service Manual