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ruechaos's Avatar
 
Join Date: Jul 2001
Location: Saint Louis, MO. USA
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What are these..?

You guys are probably going to get sick of me asking,"what's this? what's that?" but I honestly do try other resorces before posting. (Haynes, Porsche shop manuals, etc.)



The two items circled hook up to the engine wiring harness. If you follow the arrow you will see that they both go into the clutch housing. What could thry be, and what are they doing in the clutch housing? Tach maybe..?

Thanks guys!

-Tony
'84 944NA
Old 05-12-2003, 06:33 PM
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TDC and RPM sensors. Closest one to the engine is your TDC sensor
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'84 944 auto/ps/ac/cc
'86 951
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Old 05-12-2003, 06:39 PM
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Don't move that bracket unless you absolutely have to
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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 05-12-2003, 06:40 PM
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But this car is an '84..? I thought that they didn't start that until 85.5?

TDC = Top dead centre?
And why not move the bracket?

Thanks for the reply!

-Tony
'84 944NA
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Old 05-12-2003, 06:49 PM
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Don't move the bracket cause I think it has to be EXACTLY 8mm off the flywheel or your car won't run. The sensors tell the DME when to fire or something like that.
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Old 05-12-2003, 06:54 PM
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Wow! That's good to know! Thanks!

-Tony
'84 944
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Old 05-12-2003, 07:43 PM
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The Top Dead Center sensor sends a pulse to your DME when the little stud on your flywheel passes by. To do this, it has to be 0.8mm away from the stud when it passes by. If you mess with the bracket, it's a bizitch to get lined back up. The RPM sensor counts the teeth on the flywheel as they zing by. The top bracket you may move as you wish, the part with the plugs. The stud is 5mm high. There is very little tolerance in the measurements.
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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 05-12-2003, 07:44 PM
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Actually there are a total of three senders. The two circled are the impulse senders (both part #944 606 115 00), also called speed reference senders that help the DME know when and for how long to fire a spark pulse (timing and dwell?) the TDC sensor also called the timing mark sender is part # 911 606 108 00 and I think it's just to the left of the other two on the clutch housing.
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Old 05-12-2003, 09:29 PM
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These are the Engine Speed and Timing Mark Reference sensors. One tells the DME how fast the engine it spinning, and the other tells the DME when #1 cylinder is at TDC. Engines prior to 85.5 do not have a seperate TDC sensor.

In order to function properly the sensors must have a 0.8mm clearance with respect to the teeth on the starter ring gear (speed sensor), and an Allen head set screw in the fly wheel (TDC sensor). This is set by adjusting the mounting bracket. If you move the bracket, you loose the setting, and it is a major PITA to get right.
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Old 05-13-2003, 09:32 AM
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Hey,
I don't know if you guys have ever done it, but I pulled these today and cleaned them off. Part of some trouble-shooting I was doing to fix a timing problem I think I caused. They were both covered in black sludge and had metal particles clustered at the magnetic sensor tips. Used WD-40 and re-installed without moving the bracket and she purrs like a kitten. I recommend you take the 30 min if you've never done it to check on yours. All it required was the can of WD-40 and a ratchet with an extension, a swivel coupling and a 10 mm socket.
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'85 (Early) 944 - Beater
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'76 924 - Long Gone
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- Mario Andretti
Old 05-13-2003, 09:37 PM
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I managed to take off the bracket that holds the TDC and RPM sensors in place any good advice on getting it back into place? Also my engine is in about a million pieces.
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Last edited by ace_944; 01-30-2009 at 10:08 AM..
Old 01-30-2009, 10:03 AM
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Quote:
Originally Posted by ace_944 View Post
I managed to take off the bracket that holds the TDC and RPM sensors in place any good advice on getting it back into place? Also my engine is in about a million pieces.
you take the old sensor and glue a .8mm washer to the end, and use it as guide to were to bolt down the bracket.
BTW does anyone have an old DOA sensor i can borrow?
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Last edited by AZ_porschekid; 01-30-2009 at 10:19 AM..
Old 01-30-2009, 10:15 AM
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My set of sensors are still good so I am hanging onto them but, I used a feeler gauge (0.8mm) between the sensor and the setscrew and then set the height of the bracket.

Speedy
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Old 01-30-2009, 01:50 PM
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