the "0" on the flywheel

Thu Sep 14 22:44:56 EDT 2006

That's how the local yahoo garage messed up my 91 200 TQ20V. I took it in 
and rolled the timing mark on the flywheel and showed them the damper mark 
being off. They fixed it and magically the car was great!
John
----- Original Message ----- 
From: "Kneale Brownson" <kneale at coslink.net>
To: "SJ" <syljay at optonline.net>; <quattro at audifans.com>
Sent: Thursday, September 14, 2006 12:07 PM
Subject: Re: Re: the "0" on the flywheel


> The problem with using the vibration damper as a marking point is that 
> it's
> subject to change.  The outer rim is separated from the part attached to
> the crankshaft by the rubber.  So SJ's tricks only apply to one-time 
> usage,
> not as a reference for the future.
>
>
> At 11:34 AM 9/14/2006 -0400, SJ wrote:
>>Couple of tricks to finding accurately the "real" TDC
>>
>>1. Find compression stroke for cyl #1
>>Find #1 plug wire on Dist Cap, take off cap
>>Turn engine till rotor lines up with #1 plug wire position on Dist. I 
>>think
>>dist has a mark for this.
>>Back off engine, put finger over spark plug hole, turn engine in correct
>>rotation, verify you have compression
>>
>>2. Back off engine
>>- place measuring stick, dowel, whatever into sparkplug hole and let it 
>>rest
>>on piston top
>>- turn engine by hand, go past TDC(stick goes up and then down) and turn
>>engine backwards  . .make sure measuring stick does not bind
>>- Back off engine
>>
>>3. Find or make a reference point for the measuring stick
>>- piece of sheet metal (tin can)bolted to valve cover stud will do the 
>>trick
>>
>>4. Locate visual TDC
>>- rotate engine till measuring stick stops moving
>>- Mark Vibration Damper Pulley so you can get back to this visual TDC
>>reference later
>>
>>5. Back off the engine
>>- rotate engine in correct rotation till the mark you placed on damper is
>>about 1 or 2 inches before the reference.
>>- Put a new mark on the vibration damper pulley
>>- mark the measuring stick where it intersects the reference point (see 3
>>above)
>>
>>6. Turn engine in same direction while watching measuring stick rise to 
>>TDC
>>and then start to descend
>>- turn engine very slowly till measuring stick aligns with the mark you 
>>put
>>there at step #5
>>- Put a new mark on vibration damper
>>
>>7. You have 3 marks now on vibration damper - BTDC, TDC, ATDC
>>- measure distance between the two outside marks using a flexible or cloth
>>tape
>>- put new mark at the half-point of the measured distance
>>    This Mark is your Actual TDC
>>
>>IMPORTANT NOTE:
>>You must eliminate any slack(play) in the system to get accurate results.
>>You always have to start at the "end point of slack".
>>Always make all measurements by backing off the engine and then turning
>>engine in proper direction. This puts all engine components at their one
>>'end point of slack'.
>>All measurements are taken by backing off the engine and then rotating
>>engine in normal rotation  - this eliminates any error due to slack(play) 
>>in
>>system.
>>
>>
>>If you have too much time on your hands and dont know what to do, you can
>>finesse this to get a more accurate reading of TDC.
>>Once you have found TDC per above instructions, you can now use the
>>hydraulic pump pulley for a more precise TDC location. The hyd pump pulley
>>is smaller than vibration damper pulley so it turns maybe twice for every
>>rotation of the damper pulley. In other words, the hyd pump pulley has 
>>more
>>resolution than the damper pulley.
>>1. Place damper pulley on TDC mark you found before
>>2. Mark hyd pump pulley for visual TDC - make yourself a reference point
>>that is over the hyd pulley and almost touching it
>>3. Back off engine until the measuring stick in spark plug hole goes down
>>below the BTDC mark on stick.
>>4. Rotate engine in correct rotation till measuring stick BTDC mark lines 
>>up
>>with reference.
>>5. Mark hyd pump pulley where it intersects with hyd pump pulley reference
>>mark.
>>6. Rotate engine in correct rotation till you go past TDC and the 
>>measuring
>>stick mark again lines up with the reference.
>>7. Mark hyd pump pulley
>>8. Measure distance between hyd pulley outside marks
>>- halve the distance
>>- mark pulley
>>
>>You now have a more accurate, but temporary, TDC reference on the hyd pump
>>pulley.
>>You can now compare the three TDC marks(damper, flywheel, hyd pump pulley)
>>against each other.
>>
>>SJ
>>85 Dodge PU, D-250, 318, auto
>>85 Audi 4k - - sold but still on the road
>>88 Audi 5kq
>>90 Audi 100q
>>
>>
>>
>>
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