Re: [alfa] 164 Motronic Cam Timing Mystery

[hagen_jason@xxxxxxxxxxx]

On the 24 valves, the mark does not point up at TDC, but rather to the side (I.E. parallel to the ground).  Also, the mark is at the end of the cam (opposite end from the timing pulleys).  This is probably the same on the 12 valves.  

The "direction" of the mark may be causing some of the confusion.

--
Jason Hagen
Chicago, IL
'73 Spider
'95 164Q


> Dennis,  The Motronic 164 crank pulley has a mark etched on it that lines up 
> with a pointer on the front engine cover at TDC. Just look a bit harder! The 
> reference sensor and the missing tooth are not intended for setting the crank 
> timing.  -Farzan
> 
> -------------- Original message from Dio Genio : -------------- 
> > Digesti: 
> > 
> 
> > 
> >> 
> > In trying to learn as much about Motronic as much as 
> > possible, I rotated the crank until the two cam 
> > reference marks lined up with the cap marks, and CYL 
> > #1 was at TDC, with both valves fully closed. I then 
> > expected the "gap" in the tooth wheel to be directly 
> > aligned with the magnetic sensor (which is located at 
> > the 3 o'clock position when facing the crank pulley). 
> > Much to my surprise...it was not lined up! Rather, the 
> > "gap" was facing downwards at approximately 7 o'clock. 
> 
> > 
> > I now wonder why this seemingly strange timing is so? 
> > I also wonder how on Earth I am supposed to properly 
> > re-time the cams if I remove them? Without the crank 
> > pulley tooth "gap" referenced to anything, I'm bound 
> > to get it wrong. 
> > 
> > There's something to be said for the old L-Jet with 
> > it's TDC mark etched into the pulley! That made life 
> > (and cam timing) rather easy! 
> --
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