OM617 starter motor bench test procedure - Fried???

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Dweezil
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OM617 starter motor bench test procedure - Fried???

Post by Dweezil » Sun 19 Aug, 2018 7:06 pm

Hi Team,

What's the best 'bench' test for an OM617 (or any) starter motor?

I tried using a jump starter rather than a battery and jumper cables for ease of use and to not unduly drain the battery. I made an assumption that it would be putting out about 14V.

The sprocket moved forward and spun, but without conviction and after a couple of seconds, with smoke.

Here's the set-up:

1) On a bench, not the ground

2) Jumper pack negative to solenoid negative post

3) Jumper pack positive to solenoid positive post

4) Alligator clip from jumper pack positive to ignition screw

5) Jumper lead from starter motor body to ground

Have I buggered this up and fried the unit?

Rego grace period is fast running out, so all help hugely appreciated.

Thanks

Dweezil

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Re: OM617 starter motor bench test procedure - Fried???

Post by Dweezil » Sun 19 Aug, 2018 7:58 pm

Ah, crap, I just realised that I should have had the negative cable going to the body, not the negative post. It's been a long day...

For those who know the electrics, have I indeed fried the solenoid and/or starter?

Thanks

Dweezil

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T-Modell
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Re: OM617 starter motor bench test procedure - Fried???

Post by T-Modell » Sun 19 Aug, 2018 8:29 pm

Just connect it properly and see what happens. It should make noises without smoke :whistle:
Thomas
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Re: OM617 starter motor bench test procedure - Fried???

Post by Dweezil » Sun 19 Aug, 2018 9:35 pm

Yep, did that. Didn't do anything. Looks rooted.

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Re: OM617 starter motor bench test procedure - Fried???

Post by Tony From West Oz » Sun 19 Aug, 2018 11:17 pm

Looks like you have fried the jump starter, or burnt the solenoid contacts so they don't make a good contact.
Use a multimeter to check for voltage from the jump starter and resistance between the big bolts on the solenoid when you put neg. on the body and pos. on the solenoid coil terminal.
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Re: OM617 starter motor bench test procedure - Fried???

Post by T-Modell » Mon 20 Aug, 2018 5:37 pm

I'd go to a wrecker and see, if you get one. A new one should be around 250-300 Euros here, I don't know in Oz. If you have time on your hands, you can dismantle it and see, if there's something to rescue ...
Thomas

P. S.: Is that the motor for the W111 Coupé?
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1967 W111 250SE Cabriolet, horizon blue
1973 W115 220D 5.0 Pick-Up Argentina, work in progress 2017/18/19
1986 R107 500SL, arctic white, the midlife crisis viagra replacement
2007 R171 SLK350, calcit white
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Re: OM617 starter motor bench test procedure - Fried???

Post by Dweezil » Mon 20 Aug, 2018 7:21 pm

A kind gentleman has agreed to sell me one.

Unfortunately, the W111 coupe is still a while away from gracing the road. Possibly this decade.

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Re: OM617 starter motor bench test procedure - Fried???

Post by T-Modell » Mon 20 Aug, 2018 7:25 pm

Dweezil wrote:
Mon 20 Aug, 2018 7:21 pm
...Unfortunately, the W111 coupe is still a while away from gracing the road. Possibly this decade.
If you define the start of the next decade on 1.1.2020, then you don't have long to go :laughing6:

Good luck with the starter!
Thomas
---------------------------------------------------------------
1967 W111 250SE Cabriolet, horizon blue
1973 W115 220D 5.0 Pick-Up Argentina, work in progress 2017/18/19
1986 R107 500SL, arctic white, the midlife crisis viagra replacement
2007 R171 SLK350, calcit white
2008 S211 E63T, calcit white, sleeper

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Re: OM617 starter motor bench test procedure - Fried???

Post by John Green » Mon 20 Aug, 2018 9:54 pm

T-Modell wrote:
Mon 20 Aug, 2018 5:37 pm
I'd go to a wrecker and see, if you get one. A new one should be around 250-300 Euros here,
Dam, I sold it too cheap.... :banghead: :banghead:
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Re: OM617 starter motor bench test procedure - Fried???

Post by Dweezil » Wed 22 Aug, 2018 1:53 pm

Ok, so just to make sure I'm not losing my mind, here's me doing a bench (floor) test of my M127 starter. Forgive the less-than-stellar cinematography:

https://www.youtube.com/watch?v=cSZ_n4k1ACg

+ to + post, alligator clip from + to ignition screw, - to body, just where the holding bolt goes. All good.

Here's me doing EXACTLY the same thing on the freshly-delivered OM617 starter:

https://www.youtube.com/watch?v=CYumPkjq9m0

A little whiff of smoke and whole bunch of nothing else.

Any ideas greatly welcomed.

Thanks

Dweezil

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Re: OM617 starter motor bench test procedure - Fried???

Post by Dweezil » Sun 26 Aug, 2018 4:35 pm

Finally figured out what was going on. The brand new alligator clips that I bought were frying. When I used the screwdriver bridge method it worked fine. :wall:

Dry compression figures as follows:

260 280 220 240 240

The unevenness between 2 and 3 is the obvious worry. All perspectives on whether this is worth reinstalling gratefully accepted.

Thanks

Dweezil

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Re: OM617 starter motor bench test procedure - Fried???

Post by mathuisella » Mon 10 Sep, 2018 1:16 pm

https://www.gumtree.com.au/s-ad/northco ... 1173804590

just in case.

also, try a new valve adjustment and redo the compression test.

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