Dougs951S

I have a question guys. I'm about to bolt the reference sensor back onto the bellhousing, and I have a gapping tool made from an old sensor with a .8mm thick washer glued to the bottom. Tool has worked great in the past but it's been a long time since I've had to use it. The reference pins stick proud of the edge of the flywheel by ~4mm. That being said, does that mean that when I install the bracket and gap the sensors that I need to have the sensor directly over one of the pins? If I don't position it directly over the pins and set the clearance .8mm from the smooth part of of the flywheel, wont the pin and the sensor still have ~3.2mm interference fit and therefore the flywheel will smash the sensors? Am I missing something here?

tempest411

No, that sounds right to me. Just make sure the pins are directly underneath the sensors when you fit them.

Dougs951S

10-4!

Dougs951S

I just thought, is the bracket designed in such a way that if I set the speed sensor (the rearmost of the two) so it's .8mm from the ring gear teeth, will that automatically ensure that the reference sensor is the proper clearance from the pin on the flywheel, assuming the pin is at the correct height?

JacRyann

No, because the reference pin is adjustable. It may end up being more or less than 0.8mm when the other sensor is 0.8mm away from flywheel teeth. Best to rotate crank so you can check spacing on both.

odonnell

Here is the procedure... you DONT gap the reference sensor for that very reason.. the pins are only in a few places. I think there's only one pin actually inline with that sensor.

Instead, you gap the speed sensor, where there is a 100% chance of there being ring gear teeth below your tool. You set THAT gap to 0.8mm. The geometry of the bracket allows there to also be 0.8 on the reference sensor, assuming you didn't play with pin height.

Dougs951S

Pretty much what I thought Michael. I'm using the flywheel from the old motor so the pin height isn't a factor. Procedure is: insert gapping tool into rear spot (speed sensor), tighten bracket, remove tool, insert sensors, enjoy beer.

Michael, the trans is back in and everything is together. Tomorrow I will bolt the manifolds on and put the new radiator in and start it up!

Oh yeah, and gap the sensors!

Otto Mechanic

Hmm. This is something I just did and now you've got me thinking I've done it wrong, but not sure since I have an S2. There's no speed sensor on an S2, just the reference.

I used a spark plug gap tool to set the gap and tightened the set screw. I haven't started the engine yet so if I've done it wrong it would be great to hear about it now...

odonnell

It's technically speed and reference, since there are missing teeth (you're reading a dedicated tooth pattern in the 16v cars, unlike the starter ring in the 8v cars). You gapped the correct wheel, unless you got unlucky and found the spot where there are missing teeth...