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DIY AAN Cam Position Sensor on a 3B

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 Post subject: DIY AAN Cam Position Sensor on a 3B
PostPosted: Tue Jul 26, 2016 11:40 pm 
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Alright, so as I'm doing my 20v swap into my '89 200, I've decided to go with VEMS. Along with this I'm going to be running a coil on plug setup and since it's almost impossible to find a 3B distributor and my motor did not come with one, I took matters into my own hands and made a custom mount for an AAN cam position sensor.

So here's my write-up if anyone needs instructions on how I did it!

Parts list:
1 x AAN Camshaft Pulley
1 x AAN Camshaft position sensor with bracket
1 x Square L shaped aluminium bracket (mine was 3inx3inx.25in iirc)
2 x 6mmx1.25mm hex head bolts
2 x 6mmx1.25mm allen head bolts

I started by making a temporary mount for the sensor to allow me to position it properly with the rotor on the back of the AAN pulley.
I did this by using a little piece of some flat aluminum bar and a bolt, with the other end bolted to the timing belt cover bolt from the head.

Image

Image

Ironically, this mount actually placed the sensor at the perfect distance from the head to line up fore/aft with the rotor on the back of the pulley. After doing this, I moved the mount around until the left/right positioning was correct, and then clamped it down so the sensor wouldn't move.

To mount the actual bracket itself, I used the two blanks on the exhaust side of the head, as shown below.

Image

I then clamped the bracket onto these blanks and proceded to draw out (clumsily) where the bracket needed to be cut to clear the oil passage access on the front of the head.
This is the only photo I got, which was after I cut the bracket, but you get the idea.

Image

After tracing it out, I used a hacksaw and file to cut the bracket for clearance, then drilled/tapped the blanks on the head to accept the two 6mmx1.25 bolts that are used to secure the bracket to the motor.

Image

Image

With the bracket mounted on the side, I marked and drilled the holes for the sensor to mount to the bracket, and again tapped the holes for a 6mmx1.25 allen head bolt. I used an allen head because a hex head would not fit.

Image

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This is the final step, all I did now was screw the sensor into the bracket, and remove the temporary mount on the timing belt cover.

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You will also need to modify the rear timing belt cover, but it's as simple as cutting out the section where the bracket interferes.

Image


Let me know what you think and if you have any questions/comments or ways I could improve this. I'm open to suggestions!

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Peter T Golledge

I drive cars that are older than I am...

Otto -'89 200 TQ - 20v swap into a 10v body to make the purists mad...
Project Thread - https://www.motorgeek.com/viewtopic.php?f=6&t=58313&start=0
Veronica - '91 200 20v Avant - Lehmann Stage 1 - On hold for the moment.
The Blue Armadillo - '95 90q 2.crap - Rally car project in humble beginnings. 20v swap soon!


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 Post subject: Re: DIY AAN Cam Position Sensor on a 3B
PostPosted: Thu Jul 28, 2016 7:25 am 
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bracket to hold the cam position sensor:
Image

custom "alien" template to hold the bracket while welding on:
Image

bracket welded on:
Image

right on spot:
Image

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 Post subject: Re: DIY AAN Cam Position Sensor on a 3B
PostPosted: Thu Jul 28, 2016 10:12 am 
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Location: Milton, Canada
varia wrote:
bracket to hold the cam position sensor:
Image


is someone making these for sale?
I have 8 7A cylinder heads that need to be modded.. ;)

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Martin Pajak
www.quattro.ca
82 Ur-q - SQ project, long term
83 80 q - Euro 2-door!!
85 Ur-q - Euro with 3B
93 90 quattro - S2 Limo copy
93 80q Avant - 2.5TDI, 6-speed in the works
04 A4q avant 1.8T USP 6-speed
04 A4q avant 3.0 USP 6-speed


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 Post subject: Re: DIY AAN Cam Position Sensor on a 3B
PostPosted: Tue Aug 02, 2016 7:16 pm 
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ralleyquattro wrote:
is someone making these for sale?
I have 8 7A cylinder heads that need to be modded.. ;)


What you doing for the water manifold openings on the 7A heads?

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91 20vt Avant (The Couch Rocket...So fast in such comfort..)
83 URq ("Roland" Think: 'The Gunslinger'.. Just gets the job done.. )
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 Post subject: Re: DIY AAN Cam Position Sensor on a 3B
PostPosted: Tue Aug 02, 2016 7:26 pm 
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you can easily drill it without a cmc mill

Attachment:
7a_head_water_manifold_fitting_machining.jpg
7a_head_water_manifold_fitting_machining.jpg [ 104.16 KiB | Viewed 1561 times ]


Attachment:
7a_head_waterrail_jig.jpg
7a_head_waterrail_jig.jpg [ 148.95 KiB | Viewed 1561 times ]

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 Post subject: Re: DIY AAN Cam Position Sensor on a 3B
PostPosted: Fri Oct 09, 2020 9:25 am 
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Joined: Fri Oct 09, 2020 3:43 am
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Freepetra wrote:
Alright, so as I'm doing my 20v swap into my '89 200, I've decided to go with VEMS. Along with this I'm going to be running a coil on plug setup and since it's almost impossible to find a 3B distributor and my motor did not come with one, I took matters into my own hands and made a custom mount for an AAN cam position sensor.

So here's my write-up if anyone needs instructions on how I did it!

Parts list:
1 x AAN Camshaft Pulley
1 x AAN Camshaft position sensor with bracket
1 x Square L shaped aluminium bracket (mine was 3inx3inx.25in iirc)
2 x 6mmx1.25mm hex head bolts
2 x 6mmx1.25mm allen head bolts



Hey Freepetra, was it truly only the CPS, bracket/mount, and the cam pulley you needed to have the CPS work on your 3b? I am looking to completely ditch the distributor, not even the empty dizzy, "tuna can", on my 3b so I can use just the CPS like the late-AANs and EFI's coil conversion. I cannot seem to get clarity of what is needed beyond the CPS itself - some say just that, some say that and the AAN cam, another post listed the entire front end (oil pump, water pump, timing belt, etc). Would be helpful to know.


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 Post subject: Re: DIY AAN Cam Position Sensor on a 3B
PostPosted: Fri Oct 09, 2020 9:41 am 
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Location: Lost Angels, Ca
You need the oem AAN cam gear (or an equivalent after market) and the bracket installed to hold the Cam Position sensor.

https://www.flickr.com/photos/quattro4l ... 172505700/

https://www.flickr.com/photos/quattro4l ... 172505700/

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