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Old 12-21-2017, 08:00 PM   #21
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Here is the starter from my 91 5.9. To the right of the bolt and cable is a cover held on by 3 bolts that is where the solenoid plunger and the starter contacts are. You can buy these replacement parts very inexspensively. Also the ammeter is shunted so it does not have the full amperage going through it, just a calibrated percentage.
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Old 12-22-2017, 09:27 AM   #22
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Originally Posted by cadillackid View Post
are our starters like that one picutred??? thats a GMC style starter with an integrated solenoid.. THAT type of solenoid moves the gear... if your solemnoid is external then no the solenoid doesnt movde the gear.. those are just a big switch and inertia moves the gear out to engage the fly wheel.
-Christopher
On the smaller cummins(3.9-5.9) engines they use a denso gear reduction style starter.

I linked the video to show how the bendix and one way clutch operates because it showed it well and I feel that is his problem.

Larger cummins (8.3+) engines will use a similar starter as the video, where the solenoid will help start gear engagement.
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Old 12-22-2017, 01:58 PM   #23
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Cummins's Quickserve gives the number as ST9068.

that doesnt really google a match but it has plenty of pictures.



napa lists some different ones for a 3500 94 dodge.
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Old 12-22-2017, 02:02 PM   #24
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On most Cummins there are usually several starter options. I know my 4BT shows three or four as well as both right and left side fitting. Can be tricky at times finding the right one as a direct replacement on some older engines.
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Old 12-22-2017, 02:02 PM   #25
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Someone upthread mentioned that maybe it wasn't "greased" properly.

Bendix gears run dry! Maybe a little graphite lubrication, but basically none at all.

If they get grease or oil on them, they can stick.
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Old 12-22-2017, 11:58 PM   #26
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well, it sounds like no matter what, its coming off.

i could have dinged it up the starter with the trans swap. i did grind one of my first steel spacers into dust. it could have been there. the edge of the flywheel that catches the starter gear is a bit rounded over.

tomorrow or sunday i'll start it and see how it goes. if its ssdd, the starter will come off, if all it needs a cleaning, it be worth the time. if its ssdd the second time i'll get a new one.

last weekend i tightened battery connections so maybe i'll have better luck as well
i did find the part number
3924410 which does translate in napa's online system
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Old 12-23-2017, 12:11 AM   #27
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Skimmed the thread so not sure if mentioned, but did you shim the starter when you changed transmissions? If that's where it was mounted....I was JUST laying under my bus starter 10 minutes ago, didn't look.

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Old 12-23-2017, 09:55 PM   #28
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i got the bus started today and made my weekly maintenance loop.

here is a better description of of the starter noises.
it engages and the flywheel turns it a bit and then the starter flys off and winds up.

after an hour of trying, i got it started. i let it sit plenty, but i know i havent been kind to this starter in the past.

the ammeter was all over the place again. i suspect loose wiring.

as i rolled down the road, the bus made a horible dragging noise. i hit the flashers and pulled over. got out and looked under the bus for what ever had broken loose. nothing!

i got back in and started on my way again, and then it happened again, that clanky dragging noise. this time i realixed i was a glass bowl in the microwave ratlling around.
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Old 12-23-2017, 11:30 PM   #29
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too funny.. s glass bowl... yep that can definitely sound like metal parts coming into bits!!

so after you get your bus started can you shine a flashlight up into your inspection hole and make sure the flywheel is turning true.. if the flywheel is spinning untrue then at times the teeth would be close to the starter and at other times far away.. might explain for it coming off the wheel... although it almost sounds like the solenoid fails to hold once it is engaged.. looking at the pictures your starter looks like the type that has the solenoid driven gear as opposed to a standard bendix.. ive had those type solenoids go weak on me. (on GM vehicles).. the solenoid is a separately serviceable item..
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Old 01-27-2018, 05:50 PM   #30
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the starter gave it a few more ummphhs, and she help up until today.

i pulled out the starter and see the problem immediately. the starter gears have worn and no longer make contact on the flywheel.



i got a new one ordered and on the way.
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Old 01-28-2018, 10:59 AM   #31
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Pretty good guess that you found the problem. Quite a bit of wear there. Do make sure that whatever starter they sell you matches what you have (except for the wear, of course). Cummins has quite a number of starter configurations for most of their engines.

Best of luck on the replacement.
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Old 01-28-2018, 11:45 AM   #32
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Thanks.

surprisingly, the Cummins Quickserve number came up when i plugged it into NapaOnline.

3924410

the picture looks right. says its obsolete, has a new part number for replacement. this broken starter is newer than the motor and probably is the same one.

when i changed the transmission, i did grind up one of the spacers i made for the first go round. the spacer probably got caught in between the fly wheel and starter a few times and ground down a bit then. i remember seeing the mating flywheel edge is a bit worn too.

i think with a new starter, she'll be good to go a few more miles.
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Old 01-28-2018, 12:10 PM   #33
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Have you considered rebuilding the existing starter with a new bendix gear?
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Old 01-28-2018, 12:28 PM   #34
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well, yes and no.

i just called napa and got it coming. i see now that if i slowed down a bit, i probably could have saved $100, from an online parts place.

10479618 28MT New Starter | Product Details | Delco Remy

i did see their rebuild kits. however the part that is worn, #2 in the picture?, doesn't have a rebuild part number.

its done, just waiting until Tuesday now, to move.
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Old 02-02-2018, 03:46 PM   #35
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when replacing the drive be sure and count the teeth on the drive gear as there are different tooth counts for most of the heavy duty starters depending on application and I have seen the wrong drive in the right box.
the offset grind on driven gear gear is normal as that eases the meshing of the drive into the driven gear on the flywheel.
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Old 02-02-2018, 04:41 PM   #36
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Quote:
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well, yes and no.

i just called napa and got it coming. i see now that if i slowed down a bit, i probably could have saved $100, from an online parts place.

10479618 28MT New Starter | Product Details | Delco Remy

i did see their rebuild kits. however the part that is worn, #2 in the picture?, doesn't have a rebuild part number.

its done, just waiting until Tuesday now, to move.
There wouldn’t be a rebuild part # for the Benedix, the Benedix is new. You could have (if the motor part of the starter is good) bought the new Benedix and installed it yourself.
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Old 02-02-2018, 06:03 PM   #37
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thanks!


i got the new starter in and it was an easy job. 3 bolts, 2 electric connections. and she starts easy, no heartburn or queasy wondering if..... she just starts.

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Old 02-02-2018, 06:18 PM   #38
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Excellent. Rebuild the old one and keep it for a spare.
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Old 02-03-2018, 11:04 AM   #39
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In looking at the old starter teeth you may still have a problem. The teeth are ground like the starter is too far away from the flywheel. You may have the wrong bendix in there originally. Did you check the flywheel teeth? they may be damaged by now. Just hope this problem doesn't re occurr.
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Old 02-03-2018, 11:35 AM   #40
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The drive gear in my experience never enters the driven gear more than about 60% I believe that that is to facilitate spin out once the key is released.
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