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#1
02-04-2013, 05:02 PM
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TDC Indicator??
I spent all day trying to figure out what this is and used for. 1975 450SL
My driver has this sitting there with 2 whitish leads running from this, and a 3rd with 2 wires going to the wire block under the resistors on the drivers wheel well. One of the leads goes to a black cylinder with a hole thru it, the other was unknown, it has a screw cap with a electrical receptacle under it. The bracket that hold this mounts to the power steering pump. After looking at the one on my parts car I see 1 lead goes down and is mounted to a bracket by the crank timing pulley, so mine was broken there. what is it used for and is it needed? I have a few pics but do not know how to add them here. I do not see a manage attachments button Last edited by AZreGuy; 02-04-2013 at 05:16 PM. 
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#3
02-07-2013, 01:14 PM
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That's the closest thng there is to a dignostic port on a '75 D-Jet. There is a Hall-effect sensor that is aimed at the harmonic balancer, looking for a nub that is aimed at the sensor when the engine is at TDC. The only use is for a timing meter. The little 'shoe' on the fender that looks like a wire connector is the terminal for an external tachometer for use while setting the idle RPM.
Mine was missing when I got the car, and it really isn't needed. If I could figure out how to get a 36-1 tooth wheel on the balancer, it would be perfect for the Megasquirt project to use the sensor bracket. Scott
__________________
Remember, it's not just a car. It's an Adventure.
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#4
02-07-2013, 01:49 PM
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Thanks for the info, I have 2, one with a broken sensor housing
I removed and still seem to have issues with the EGR removal and vacuum lines, backfires when I rev. So I just wanted to make sure that was not the problem. I added the Crane kit hoping that would help but no.
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#5
02-08-2013, 03:26 PM
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Quote:
If I remember correctly, Backfiring after revving the engine is usually a timing problem, but it's been decades since I was involved in that vehicle. What are you having trouble with on the EGR removel? Do you have a digrm of the vacuum lines? There is an online vsite with the Service manual here: Model 107 Searching through that will give you a LOT of info. Scott
__________________
Remember, it's not just a car. It's an Adventure.
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#6
02-08-2013, 06:28 PM
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when i replaced the E manifolds I lost EGR mount and am trying to figure out what vacuum lines and if I still need the vacuum switch as it T's with the dizzy advance line.
why electric on vacuum pods? I am also trying to find out if I need to change the timing and what other adjustments are needed now that the cats are removed.
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#7
02-08-2013, 06:54 PM
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Quote:
I'm planning on using the valve mount on the left manifold to put in a wideband O2 sensor, so I have to figure out the same thing. The Electric Thingys (sorry-technical term :-) ) are electrically operated valves: If a sensor, such as a temperature sensor, is warm enough, then it will send a signal to the valve, letting it open or close to permit or prevent vacuum to go to a device, such as the vacuum advance/retard. Scott
__________________
Remember, it's not just a car. It's an Adventure.
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#8
02-08-2013, 09:52 PM
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I set timing to the 1974 (no cats) spec of 5 ATDC and it ran great, however when I came home I was going to check the varying degrees of timing at the different RPM's I noticed the timing at 750 RPM's went to 12 ATDC.
Does timing need to be done with hot or cold engine? I do not know if I want to mess with because it has never ran better... SO FAR!
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#9
02-08-2013, 10:56 PM
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Quote:
I'm mot too sure I'd mess with it if it was running good. If it can pass emissions, or a reasonable facsimile thereof, just enjoy the ride.
__________________
Remember, it's not just a car. It's an Adventure.
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