Re: 5k cstq -- jumped timing??

[paul.heneghan@bbc.co.uk (Heneghan,Paul)]

From: brv@chrysler.com

>     Gentlemen of infinite wisdom-
>
>     Went out to start my Q the other day and noticed that it idled
>     terribly and only registered 10 in of vacuum on my mechanical gage.

Hello Brian
If there is no vacuum leak, then you have a problem with ignition 
 timing being too late, or valve timing too late.  From the excessive 
 sound of your symptoms, it sounds like valve timing.  This could be 
 caused by the belt jumping a tooth, the belt being replaced 
 incorrectly, or (as in my case) disintegration of (woodruff) key 
 between crankgear and crankshaft or camgear and camshaft.

     The final thought was a skipped timing belt.  I set the engine up on
     TDC, I think (my cam pully does not have a dot on it but has a line..
     the outboard face has a dot which doesn't seem to line up with
     anything) and the flywheel indicates I'm off by a few degrees (again I
     did not find a "0" mark on the flywheel but found another line..is
     this correct?).  The belt was not missing any teeth and the tension
     seemed ok.

All the cam pulley I have seen (only five actually) have a dot on them 
 on the rear (facing the engine).  Because the camshaft rotates at half 
 engine rate, you sometimes get fooled into setting the engine at TDC, 
 but with the camgear mark 180degrees away from the correct point - 
 rotate the engine another revolution and everything will align.  There 
 has been some discussion on this list recently about the accuracy of 
 the alignment of all these TDC marks.  I personally think the accuracy 
 is reasonable on my engines.  There is one more mark worth checking - 
 the harmonic balancer (front pulley attached to crankgear) has a notch 
 which should align with a protruding dimple on the timing belt cover.

The flywheel always has a 0 stamped on it.  Sometimes this is really 
 difficult to see - it is worth painting white corrective fluid onto it 
 so that it stands out.  There is usually a line engraved at the 
 appropriate timing point (18degrees BTDC) on my I5s.  This will be 
 marked on different locations for the different engines.  New 
 flywheels have no mark and the Benley manual shows how to locate and 
 make this mark.

E-mail me if you need more information.

Paul
paul.heneghan@bbc.co.uk
1984 Audi 80 quattro
1983 Audi 100 Avant