[s-cars] []s-cars] Flywheel TDC mark

[Jeremiah Curry]

I just did my 95.5s timing belt this weekend.  There were large square 
pieces of metal on the flywheel, but they were not the mark.  There was a 
fairly faint line on the flywheel at the correct point.  I lined up the 
marks on the pulleys on the front first and then checked on the flywheel and 
was able to see the mark.

It is actually set up so that the mark is just outside the windows when at 
TDC.



-----Original Message----- 
From: Tom Green
Sent: Tuesday, October 27, 2015 3:18 PM
To: s-car-list at audifans.com ; radek at uniserve.com
Subject: Re: [s-cars] []s-cars] Flywheel TDC mark

I believe there is a difference, but it does not look like a documented 
factory
change, but rather sloppy work omitting the mark on many of the later 
engines.
I don’t even know where to place any blame since I don’t know if the 
flywheel is
attached at the engine plant or later, but my understanding is the mark is 
not made
until the mechanical relationship between #1 cyl TDC is established with 
flywheel
position since this mark is the most precise.  I can only surmise that the 
worker
responsible for this retired without training a replacement.

IME, the square marks have no place in timing measurements.

The little oval mark made with a hand stamping tool and hammer that
seems to be on every rusty flywheel for early models just is not there on
some later vehicles.  Flywheel changes can account for some since a new
flywheel won’t have a mark, but others are known original parts.  The timing
pins for for the crankshaft timing and speed sensors give the most problems
now by detaching from the flywheel because the attaching welds were weak.

This causes many to spend some extra time verifying the marks on the front
of the engine and removing the valve cover to match cam sprocket marks and
physical piston position.

Tom

> On Tuesday, Oct 27, 2015, at 09:05 AM,radek at uniserve.com wrote:

> Is there a difference between early and late models urs4 and urs6?  We
> are doing a timing belt job on my son's 1996 and all we can find on
> the flywheel are two small square ridges, one a few degrees Before
> TDC, the other more or less at TDC.  Meanwhile Bentley says it should
> be a notch marking the TDC, consistent with my experience with other
> I-5s.  Any clues?  TIA.
>
> Radek.


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