[s-cars] 3B Distributor

calvinlc at earthlink.net calvinlc at earthlink.net
Thu Jun 8 00:48:14 EDT 2006

Thanks for the response, Peter.  One more question, are there now little
plastic bits floating around inside the engine?  And if so, how does one go
about getting them out?

-----Original Message-----
From: Peter Schulz [mailto:pcschulz at comcast.net]
Sent: Wednesday, June 07, 2006 7:47 PM
To: calvinlc at earthlink.net; 200q20v at audifans.com
Subject: Re: [s-cars] 3B Distributor


better to post this to the 200q20v list, but here goes...


You could consult Bentley manual, but it says to remove the IM which
I found  unecessary.
J have found that removing the ISV gives some additional room to
access the 13mm Nut that holds the distributor to the head.
But before that you will have to remove the distributor cap and deal
with the anti tamper cover if the distributor was never before replaced.
I used a combination of a dremel with a cutting disk and a chisel,
but I think that cutting a slot into the bolt would allow you to
remove it with a screw driver with less drama and work.

Bernie Benz instructions on replacing the distributor gear with a
plastic gear below:

 > I.  Preliminaries: Bentley refs  3B: 28.47, early 7A: 28.250
 > (The Audi distributor alignment tool is not necessary.)
 > 1.  Rotate the engine to #1 TDC.  Rotor pointing to #1 plug terminal and
 > 0-degree flywheel mark at pointer edge.  Get this right!
 > 2.  With dist cap and Hall sensor connector removed from the dist and
 > junk out of the way (like the 3B intake manifold) as much as possible,
 > the angular position relative to horizontal (3B), or vertical (7A)
of the Hall
 > sensor connector and the rotor (these will be opposite each other) for
 > return to original oriention purposes.
 > 3.  Remove the anti-tamper cover, if any, on the dist hold down clamp
 > located on the stud in the head under the dist location hole, remove nut
 > clamp.
 > 4.  Pull dist from its locating hole, noting that the rotor turns
 > about 1/4 inch as the dist gear is withdrawn from its mating cam gear.
 > reassembly it must go back in with this same final removal
orientation to end
 > up in the same original position.
 > II. Plastic Gear Removal:
 > 1.  Don't try to drive out the retaining pin yet!  Remove the gear
 > from its steel hub by hacksawing 2 or more diagonal cuts thru the plastic
 > the hub, pry or chew off the pieces.
 > 2.  Note that both ends of the groove pin are swaged larger than the pin
 > center dia.  Saw off the smaller pin end and file it flush with
the gear hub.
 > 3.  Support the gear hub and shaft in a suitable V block or vice jaws and
 > drive out the pin using a 5/32" dia pin punch or an old nail on
the filed end.
 > 4.  Remove the gear hub and retain the shim washer pack for reassembly.
 > 5.  Remove the shaft, not loosing the fiber thrust washer at the
top end, and
 > clean the dist body and Hall rotor.  If there is any oil in the
 > service the crankcase breather system.  (This distributor does not
use a shaft
 > seal component, just a reverse spiral groove on the shaft in the top
 > of the upper bushing.)
 > III.  New Bronze Gear Installation:
 > 1.  Install the original shim pack on the shaft, followed by the new
 > align the smaller gear pin hole with the shaft pin hole.  (Do not use the
 > larger pin hole, it is a vendor goof.)  Support the gear hub on the far
 > (not on the gear teeth) and tap the roll pin part way into the shaft.
 > the dist shaft axial clearance.  It must not be tight, but should
have 2 to 5
 > thou end play, a "just perceptable free movement" feel without binding.
 > not so, remove the gear and adjust the shim pack, + or -, as required.
 > additional .003" thick shim is provided with the gear and roll pin to
 > faciliate this adjustment.  Add or subtract different thickness shims
 > the end play is the closest to the "feel" spec.  Unlikely, but if more or
 > different thickness shims are necessary, they can be cut from
paper and added
 > into the center of the shim pack.
 > 2.  Drive the roll pin thru the assembly and center it in the gear.
 > the axial clearance "feel".
 > IV.  Distributor Installation:  without VAG alignment tools.
 > 1.  Remove the black plastic shield which may have been covering and
 > seperating the Hall area of the dist. body from the rotor.  Not all 20V
 > have this shield, which may be replaced just prior to reinstalling the
 > cap.
 > 2.  Notice that there is a line embossed on the top surface of the
Hall rotor
 > immediately under the hot end of the dist rotor, and a mating line
 > into the top edge of the distributor housing opposite the Hall connector
 > just above the Hall sensor unit.  When finally in place and locked
down these
 > two lines must line up with each other with the engine at TDC.
 > 3.  With the dist and rotor lined up about as it was as you removed it
 > forgot where that was, didn't you?) insert the dist, moving the rotor as
 > necessary to get the gears to mesh.  Once all the way seated in
place,  while
 > applying a slight counterclockwise finger bias to the rotor (thus
 > gear mesh clearance), adjust/rotate the dist body to exactly line up the
 > marks, and lock it down (lightly, you may have to move it again) with the
 > clamp and nut.  If you are not happy with the resultant orientation angle
 > the Hall connector, pull the dist just enough to free the gears
and rotate the
 > rotor one gear tooth in the same direction that you would like to move
 > Hall connector when the two marks are again lined up.  The distributor
 > work in any oriention, as long as the two lines are lined up at TDC, the
 > actual oriention just facilitates the electrical connections to the Hall
 > dist cap.
 > 4.  All 200 owners who elected to short cut and not remove the
intake manifold
 > per Bentley, must now curse loudly at the Audi gods for the
inaccessability of
 > the whole dist system and the dist cap hold down clamps in particular.
 > owners need not comply.
 > 5.  "Reinstall all components in reverse order of removal".  More
of Bentley's
 > sage advice.  If the engine won't start, recheck your TDC position for
 > accuracy and then the distributor marks alignment for its
accuracy.  They must
 > be right on.  Do not attempt to move the dist with the engine running as
 > did with those old point type dist, as this dist does not determine
 > ignition timing.  Thank you for flying united.
 > E-mail if you have any serious problems with your installation or with
 > instructions.
 > Bernie

At 09:27 PM 6/7/2006, you wrote:
>Well I got bit by the 3B plastic distributor gear problem today.  I was
>wondering if anybody had replaced this themselves, and if so is there a
>writeup on it anywhere?  ALso, if anybody has a spare 3B distributor laying
>around with the metal gear that they want to part with I would be
>interested.  Thanks!
>S-CAR-List mailing list
>S-CAR-List at audifans.com

-Peter Schulz
Chelmsford Ma, USA

1991 200 20v Q Avant Titan Grey
1991 200 20v Q Avant Indigo Mica
1991 90 20v Q Red

1990 CQ silver (awaiting S2 engine transplant)
1991 CQ silver  (potentially replacing the 1990 for  the transplant)
1990 CQ red ( to part or not)

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