nitehawk951

So here's the situation,

A few days ago I tried to change my reference and speed sensors on my 944 turbo (1986). I had no problem removing the speed sensor, however the reference sensor gave me a lot of trouble. After giving up on PB blast and WD-40, I decided to remove the sensor bracket. It came out easily and I discovered that the reference sensor had been dented due to it being a hair too close to the flywheel.

Here's my question/problem:

I read the instructions on Clarksgarage several times and installed the sensors and bracket by measuring the clearance per the washer method outlined on the site. The problem I'm having is that I took a few pics and made a mark on the bracket to kind of reference where it had been prior to removal. But, the weird thing is that the bracket looks like it's in the same exact place as before, even after closely following the directions on Clarksgarage; if not closer to the flywheel. I used an old sensor, cut off the electrical lead and glued a washer to the end to measure clearance. I kind of triple checked my work only to find the same result. Am I just tripping or has anyone else gone through this feeling of uncertainty? I mean, the clearance is after all only a millimeter. And if it's that small, I guess I shouldn't expect to see much of a difference anyway in the appearance of the mounting bracket.

Any similar stories, advice or opinions on the job are welcome. Sorry for the length of this post, I'm just a little skeptical....

Also: Prior to me doing this job the car ran just fine, needing the usual little TLC. My belief is that the last person to adjust the bracket didn't check clearance and was lucky enough to have the flywheel just graze the sensor enough to dent, but not render it inoperable.....?

mytrplseven

Here's my take for what it's worth. Your car has a shim that looks like a figure 8 and if it's not included with the speed sensor, when you do the adjustment per the book, the speed sensor will hit the flywheel and will look like the picture. There's two shims available. The 2mm shim is the one for the 951. They're cheap when ordered from pelican.

Dan Martinic

As of this writing, 2mm shim appears to be no longer available from Porsche; it is no longer listed on Pelican and only Paragon has it listed but I haven't checked if they actually have it.

NCLA951

My trick for setting that gap is build up pieces of e tape on the face of the sensor to .8mm, then trim to slightly smaller than the edge of the sensor. Set gap with the sensor bolted in, fix the adjustment, then pull sensor and remove tape. Takes out any worry of variations in sensor depths, and you don’t have to have a washer glued to a sensor.

rahulsingh

Hi everyone, the correct gap for 968 crank sensor is 1.0mm to 0.6mm, is it correct ?
thanks...

rahulsingh

Hi everyone, the correct gap for 968 crank sensor is 1.0mm to 0.6mm, is it correct ?
thanks...

kwikt

I glue a .8mm piece of feeler gauge to an old crank sensor tip then adjust.

fejjj

I used this one.

https://944store.com/product/dg-spee...-gapping-tool/

Tiger03447

Dear Fejjj: Thanks for the tips on the speed and reference sensor video! Great work by a verrrry patient guy and lotsa work on the car he was working on!

curtisr

This is my reference sensor depth gauge. Bottoms up!