Pin in rim of harmonic balancer?

[t-spoon]

Does anyone know what the purpose is of the pin protruding from the rim of this harmonic balancer? It is approximately 70 degrees from the OT mark.

 

[sfdon]

Its an indexing pin and was added after so many wrenches went nuts trying to assemble the crank and crank pulley without indexing only to find out that the 8 holes are NOT symmetrically spaced on the crank flange. Early flanges, dampeners and pulleys dont have a pin or an index pin- later ones do.

 

[t-spoon]

Thanks for the swift reply. So it is simply a visual marker? I am asking because I am doing an EFI retrofit and need to add 3 Hall sensor protrusions to the rim of the balancer.

 

[sfdon]

Well - what a mess....
I assumed foolishly you were referring to the ninth hole on the dampener.
My apology.
The pin you refer to is a signal to the early diagnostic system for TDC.

 

[t-spoon]

Thank you for the clarification.

 

[sfdon]

The motronic 1.3 uses a toothed wheel-

 

[t-spoon]

Is there a balancer that fits a 3.0 motor that integrates a toothed wheel?

 

[sfdon]

The M30 b35 fits

 

[t-spoon]

Thank you.