85-40-43 Checking procedure of timing chain
To conduct the checking procedure the engine has to be hand turned at the propeller to the top dead
center (TDC) position:
Turn the engine into TDC position
To detect the engine position in reference to the TDC position, an indication scale is attached
at the belt pulley at the rear end of the engine. In addition a pointer is visible at the crank
case. In figure below the TDC (“OT”) indicator and pointer at the crank case are shown.
Fig. 85 - 100 Belt pulley with TDC (“OT”) indicator
The engine is in the TDC position when the mark next to “OT” is positioned at the pointer of
the crank case.
Due to the aircraft system build up the TDC position must be checked with mirror and
torch light when the engine is attached to the aircraft.
To move the engine into the TDC position turn the propeller by hand until the TDC position is
reached. Record the values visible at the dial gauge and turn the engine for one revolution to
reach the second TDC.
Due to the gearbox transmission the propeller must be turned for a 3/5 revolution to
turn the engine for one revolution.
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