ring gear

dieselbob · May 3, 2017

I have a fly wheel ring that is worn in a couple spots, there is no replacement one available I could flip it but would have to grind the inside radius and then each tooth for engagement or use as is but clock it differently. My question is could the worn teeth be welded back in and ground to the proper shape? If so then what to use and procedure? This is on a Ford ranger Diesel 121 tooth. Thanks Bob

showcrop · May 3, 2017

Probably a better fix would be to just remove the ring gear and rotate it a little. Due to engine compression all engines almost always stop in one of 2-3 places, so that is where the teeth wear.

JD Seller · May 3, 2017

Welding and grinding WILL NOT work. The teeth would break after you try that. Just heat it up and rotate it to where the worn spots are in a different place. The worn areas show up where the engine stop on compression. So the starter engages in the same spots all the time and wear the ring gear there.

moresmoke · May 3, 2017

I disagree with JD seller that the teeth can't be welded. I have done it successfully to replace broken off teeth. And that was through the starter hole. Just regular mig or stick weld will work.

But in your situation, I would do as the others suggest and rotate the ring a bit.

MSD · May 3, 2017

Welded them up on my JD 720 diesel over 10 years ago and it is still working. I used a nickel rod I believe..

Adirondack case guy · May 3, 2017

Remove the ring gear from flywheel and rotate it about 90d and reinstall it.
Loren

Richard G. · May 3, 2017

Shouldn't those be available from Europe.
Richard

Steve@Advance · May 3, 2017

I would do some serious searching for a new one.

Turning it 90* will get it to stop on some fresh teeth so the starter will engage.

But think about it, the reason it always stops in the same 2 spots is because that is where the pistons are at mid stroke. Think about what is going to happen, the starter is going to engage on fresh teeth, then as compression builds, the starter will be in the range of the damaged teeth!

Turning it will buy some time, and you may have to do that if a new one can't be found, but...

Maybe turning it about 45* past the damage would be better?

johndeere720GA · May 3, 2017

It looks like these folks have a Ford 121 tooth ring gear.

Out of New Zealand:
Wood Engineering Services
19 Olena Ave
Pakuranga
Auckland 2010
New Zealand
Ring Gear R Us

dieselbob · May 3, 2017

Thanks for all the reply's. I clocked 90 degrees for now see if I can't get some thing ordered. Bob

ring gear

dieselbob

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showcrop

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JD Seller

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moresmoke

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MSD

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Adirondack case guy

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Richard G.

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Steve@Advance

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johndeere720GA

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dieselbob

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