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Starter Issues

M

MWB323

New User
My starter is no longer turning the flywheel.

I had my worn-out starter rebuilt recently, and bendix was replaced because it was dinged up pretty good on the tip of the splines. It worked great for all of 2-3 minutes, which tells me that it's all lined up
correctly, and proper sized bendix. But now it just makes a grinding noise and doesn't turn over at all. It went from 100% grip to 0% grip almost instantly, so I was assuming either the bendix wasn't extending or
there were missing teeth on the flywheel, but neither seem to be the case.

The bendix is extending fully; when I pulled the starter it was stuck out in the fully-engaged position. It bench tests fine, though it doesn't always return back down the shaft on a bench test (weak bendix return
spring? Or just lack of flywheel torque to throw it back?). The flywheel teeth are all there, a little dinged up in spots, but none are missing. I can't imagine why it wouldn't engage properly all of the sudden.

Any ideas? Or advice on where to look next?
 
(quoted from post at 18:09:01 01/29/18) My starter is no longer turning the flywheel.

I had my worn-out starter rebuilt recently, and bendix was replaced because it was dinged up pretty good on the tip of the splines. It worked great for all of 2-3 minutes, which tells me that it's all lined up
correctly, and proper sized bendix. But now it just makes a grinding noise and doesn't turn over at all. It went from 100% grip to 0% grip almost instantly, so I was assuming either the bendix wasn't extending or
there were missing teeth on the flywheel, but neither seem to be the case.

The bendix is extending fully; when I pulled the starter it was stuck out in the fully-engaged position. It bench tests fine, though it doesn't always return back down the shaft on a bench test (weak bendix return
spring? Or just lack of flywheel torque to throw it back?). The flywheel teeth are all there, a little dinged up in spots, but none are missing. I can't imagine why it wouldn't engage properly all of the sudden.

Any ideas? Or advice on where to look next?
Click to expand...
I would measure from the face of starter to the gear when it's fully engaged and measure how far back the ring gear is. Maybe it's not the right Bendix or maybe the Bendix is slipping. Did you turn the flywheel and check all the gears?
 
look at the flywheel teeth, you may need to take a diegrinder to them if they are chewed up and reshape them. the dinged up spots is where it has been stopping. it wont engage if the teeth are bad.
 
What tractor and year/engine. If letter series or most 3 digit number series there is a replacement Drive that is cushoned and has a better design. No big spring. Jim
 
I was thinking that as well... But I read about some circumstances where the bendix needs the thrust from the flywheel to return. Not sure how common that is.

What could be wrong with it? Most likely just the spring?
 
I recently had a new Bendix put on mine. It is a td6. The first one the Bendix did engage far enough. Shop ordered another Bendix from another supplier. It had the same part number but had a longer spring. That is why I suggested you measure it.
 
I do not know if the starter on that is in front of the FW or to the rear (like a M) If to the rear, one for an MD would work. Jim
 
If the gears are grinding on each other, surely there is obvious evidence of this on the bendix or the ring gear. The bendix was new, and should be ding-free.

Engines typically stop in one or two places, so your ring gear will only be chewed up in one or two areas on the flywheel.

Try turning your engine over to a clean section of ring gear with the hand crank or a pry bar, about 1/4 turn, then reinstall the starter and see what happens. If it engages, the ring gear is your problem. As a stopgap measure you can take the burrs off the teeth in the worn section of the ring gear and hopefully that will help, but ultimately the flywheel will need to be pulled from the engine, and the ring gear flipped or replaced.
 
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