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On the Harmonic balancer there are several marks on the right the marks start at 30* BTC (Before top dead center) Going left the marks stop at 0* (TDC) you need to line this up with a mark that is just to the right of the crankshaft position sensor. One you line up the 0* mark with the mark you will have TDC.
NOTE: There are two TDC one is the power stroke and one is the compression stroke most specs require you to be on TDC compression
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How do you determine TDC on BMW M50 525i 1991 engine?
move fac, there is a mark on the flywheel , match it with the mark on the engine block,,,good luck
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