Did I kill my starter? 1970 250c w114 - Mercedes-Benz Forum

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post #1 of 34 (permalink) Old 12-21-2014, 09:28 PM Thread Starter
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Did I kill my starter? 1970 250c w114

I've been trying to get this coupe to start for a little while now. I was confident I could make it start because it would fire when pouring fuel in the carbs.

Anyway, it felt like the starter got stuck on one of my many back-to-back attempts to start the car. (It seemed the car would run for a few seconds and then quickly stall.). I was hoping to get some heat on the carbs and maybe melt out some varnish. No go on that obviously.

I need to check to see if there's anything other than the ignition switch between the starter and battery. I guess I could have killed the ignition switch, but the ACC position does seem to work. The car just does nothing when I turn the key all the way to the right. I did check to make sure the car was in park and even tried neutral. So I doubt it's the neutral safety switch, although the car is behaving almost as if that was the issue. Nothing happens when I turn the key.

Any ideas? (Other than scrapping the car and getting it gone?)

Thanks!

.

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post #2 of 34 (permalink) Old 12-21-2014, 10:39 PM
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Hi
I had a similar starting issue recently. I went round and round checking the obvious. Battery, starter, ignition switch etc. You said you checked the car was in park or neutral? Well I did the same. What it turned out to be was the bushing linkage to the transmission had worn off!! So I thought I was in park or neutral but really the tranny was still engaged Check all your mechanical linkage, and the neutral safety switch. The new bushing set me back a whopping $8 Now it shifts lovely and starts
Hopefully this helps.
Cheers John.
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post #3 of 34 (permalink) Old 12-21-2014, 10:58 PM Thread Starter
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Yes. There is lots of slop in the shifter and I am familiar with the shifter bushing, which is why I tried starting in just about every position possible.

I was sitting there repeatedly cranking the car meanwhile in park and not messing with the shifter at all.

Maybe I will jack up the car (possibly while getting ready to part it out) and pull on the shifter linkage before giving up.

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post #4 of 34 (permalink) Old 12-21-2014, 11:16 PM
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Mine had a lot of sloppy movement. When I checked the bushing was completely disconnected from the linkage ball. Have a look, it sounds like a very similar situation.
Good luck. John.
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post #5 of 34 (permalink) Old 12-22-2014, 08:47 AM Thread Starter
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My 1971 w114 sedan with a column shifter worked in such a way that I could turn the key and hold it, and if it didn't kick the starter, I could just move the shifter and the starter would kick. It would also start in neutral.

This is a floor shifter and as I scrolled through the gears and the car did nothing, even as I moved through neutral with the key turned, the starter did nothing.

The only thing left to do with respect to shifter linkage IMO is to get under the car and pull the shifter as far into park as I can get it, and then give starting a try. I will probably have the car up in the air to remove the tires since they look better than the ones on my black coupe. I can plan to try this then.

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post #6 of 34 (permalink) Old 12-22-2014, 09:49 PM
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This sounds a lot like the issue I was having with my 250. I couldn't get it to turn over with the key, but it would with a remote start. After I replaced the rear bushing last week it now turns over with the key. I assume mine just wasn't in park or neutral like we thought.
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post #7 of 34 (permalink) Old 12-23-2014, 02:26 PM Thread Starter
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Jacked up. Blocked, crawled under, pulled linkage all the way to the end (where it already was), pulled other way, pulled back into park. Whacked starter with hammer a few times, nice and hard. Got out from under the car and...

I don't think this has anything to do with the shifter position. Just to prove it, I went out and tried turning the key to the start position while in reverse...

So the shifter position clearly affects what the key does when in the start position. The starter just isn't doing what it is supposed to.

I wonder if there's a starter solenoid that went bad or something else that I fried with my repeated back-to-back start attempts. I need to look at a full-car wiring diagram.

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post #8 of 34 (permalink) Old 12-23-2014, 04:19 PM
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Does it have a neutral safety switch that could be bad?
Will
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post #9 of 34 (permalink) Old 12-23-2014, 04:41 PM
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I would guess it has to be something to do with the neutral safety switch. Maybe it has a short somewhere? The very fact that by moving the shifter changes the pitch sound from the radio, indicates I would think that the switch is the culprit.
Also can you manually jump the starter? Will it crank?
and I'm supposing you have checked all the ground wires etc.
John.
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post #10 of 34 (permalink) Old 12-23-2014, 04:50 PM Thread Starter
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Quote:
Originally Posted by wroding View Post
I would guess it has to be something to do with the neutral safety switch. Maybe it has a short somewhere? The very fact that by moving the shifter changes the pitch sound from the radio, indicates I would think that the switch is the culprit.

Also can you manually jump the starter? Will it crank?

and I'm supposing you have checked all the ground wires etc.

John.

I have not checked any wiring. I am more inclined to think that the starter is jammed or I fried some wires. The car consistently cranked or tried to crank before, even with a drained battery.

I had my truck running with the jumper cables for potentially an hour next to the car, and was fiddling with the idle screws on the carbs, attempting to start, then fiddling more, repeat. I probably cranked more than 100 times in an hour.

I think it was either the night before that seemingly the same problem occurred once before. Cranked, cranked, then no crank. I walked away and came back and the problem disappeared. I was able to crank probably the 100 times mentioned above until:
- crank, wait a second
- crank,
- oops, crank to early. Silence. As if it jammed or just died as the engine was settling backwards against the starter while it was attempting to move the engine forward.

Can the neutral safety switch get fried?

I still haven't looked at a wiring diagram.

.

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