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  #1  
Old 11-23-2015, 10:45 PM
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81 300SD Could it be the neutral safety switch?

First time in 34 years my SD will not start. I get no click like a bad starter solenoid or bad battery. Just no starter action; I hear one clink over by the glove compartment and that is all - no other noise at all.

I think the shifter bushings are pretty worn because I have to shift it from park to drive, then slip the shifter backwards and back up to Drive before it knows it is in Drive. And it sits and thinks a few seconds before it recognizes that it is back in Park. So worn shifter bushings which I hear are a bear to replace. So I have just been jiggling the shifter into gear.

But now no start. Does this sound like NSS? I read a thread about replacing it on a 124 and with no lift am not sure I want to do it myself.

Isn't there a way to jump the NSS or pass it by? Otherwise what do I do? Could it be something else? Would trying to jump it with my Land Rover do any good?

Thx.


Last edited by tyl604; 11-24-2015 at 07:16 AM.
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  #2  
Old 11-24-2015, 12:06 AM
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What does the number 99 stand for? Just curious.
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  #3  
Old 11-24-2015, 07:17 AM
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99 means fumbly fingers. Sorry. I fixed it this AM. Car not fixed though.
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Old 11-24-2015, 08:19 AM
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Try starting in neutral.

-J
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  #5  
Old 11-24-2015, 10:08 PM
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x2. Foot firmly on brake pedal, turn the key to start then slowly move the shifter from N to almost R and N to almost D. You should find a point at which the starter catches if it's only worn shift rod bushings. Might be safer to do the test around R checking for reverse lights rather than the starter. If that doesn't do it, I've replaced the NSS in a 124 and 126 and the 126 is easier but the 124 is possible.

To bypass the NSS FOR TESTING ONLY, there are two pairs of pins in a trapezoid arrangement. IIRC the forward pair are for reverse lights and the aft pair are for the starter. I can only be off by 50% The NSS connector has a bayonet lock.

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Old 11-24-2015, 10:13 PM
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I had a customer bring in a 123 300D to my shop, and he said "It will start in drive and reverse! I thought it wasn't suppose to do that." When I looked at the NSS it was hotwired and all jury rigged up.

Shifter bushings will definitely cause a no start, and Sixto's procedure is what I would recommend as well.
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Old 11-28-2015, 07:29 PM
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OK; will try it that way. Silly thing cranked right up today but tomorrow - who knows?

Am thinking about buying shifter bushings and trying to replace myself rather than fool with the NSS.
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Old 11-28-2015, 07:44 PM
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There's decent room to work in a 126 SD. Set the lever in D, remove the bolt and nut (2 10mm wrenches, there's a tiny washer on the nut side) holding the selector bell crank in place, remove the clip at the aft end, pull the rod and bell crank aft and out. There a MB tool to press in new bushings but I do okay with channel pliers, Sil-Glyde, a big washer (to push) and a 19mm socket (to receive). Installation is the reverse. Note which hole in the bell crank the rod went through.

Sixto
83 300SD
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  #9  
Old 11-30-2015, 07:32 AM
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Great info. Thx.
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  #10  
Old 11-30-2015, 05:31 PM
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The shifter bushings aren't that bad on the W126. Don't put it off too long or the metal-on-metal contact will wear the metal ends. Mine was worn half way through at the gearshift end. Who knows when it might have completely broken off!

As previously mentioned, take the shifter arm loose from the side of the transmission and then un-clip the other end. It took a little wedging of a screwdriver in the open area to be able to pry the arm off of there.

I just did this job about a week ago. It's possible to do it without the special pliers but for ~$20 it was worth the ease of installation. Before installing, put the new bushings in a can and pour boiling water over them to make it even easier for them to squeeze through the openings.
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  #11  
Old 12-06-2015, 10:44 PM
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Good info. Need to order from Peachparts. Do I need to put the SD on stands or leave it on the ground?

Well, I just looked at Peachparts and do not mind spending $4 instead of $1.25 on a bushing but which one do I need? Is Part #: 115-267-12-50-MBZ
the right part number and do I need two or only one? Assume I should also buy the clip.
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  #12  
Old 12-07-2015, 09:43 AM
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You need the bushings 115-992-03-10 qty (2)
and the clips 000-994-41-60 qty (2)

The other number,you mentioned, is for the bushings inside the shifter. Replacement of those is much more involved and may not be necessary at this point.

You will need the front of the car in the air, on stands or ramps.
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  #13  
Old 12-07-2015, 12:26 PM
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Blue - got it. Thanks. Ordering today.
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  #14  
Old 12-07-2015, 12:36 PM
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try tapping starter with a hammer next time.If it starts you will need to buy a starter.I have had good luck with my advance starter 4 years now.
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  #15  
Old 12-07-2015, 12:45 PM
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Old - yes, thought about that too.

Just ordered the bushings and clips for $20 delivered; pretty good deal.

Thx.

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