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Changing a Briggs ring gear.


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#1 UncleWillie OFFLINE  

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Posted April 28, 2016 - 09:35 PM

Let's face it, we have all been there. Only little slip up and you have ruined a perfectly good ring gear. Dispair not good fellows, there is hope. You can change them. It is pretty straight forward.


Tools needed:

Hammer
Sharp cold chisel
Screwdriver
Ratchet and socket
Bench Vice Or a brave helper
Block of wood
Punch

Optional - cold beverage of choice
Bandaids

Materials needed.

One flywheel with bad ring gear
One flywheel with good ring gear
4 Machine screws and lock nuts (sorry I didn't note the size I carried the ring gear and a rivet to the parts store I think 1/4 - 20 but I may be wrong)

The ring gear is held on by 4 rivets - the bumps between the cooling fins in the pic. These are fairly soft.
IMG_20160428_143818580.jpg
Place a flywheel(I recommend starting with the bad one in case you learn something you should not do to the good one) in your bench vice putting a piece of wood on the ring gear side to keep from breaking it.

(Tech tip - make sure there is as much crap as possible on your work bench. It so much nicer to work with stuff falling on your feet every time you use the hammer.)

Trust me you want to use a vice or this will happen - ouch!
IMG_20160428_143821595.jpg
Using the cold chisel and the hammer (duuh) cut the heads off the rivets. Take care to not break a cooling fin off. Don't try to break the heads off in one swing. Work your way through. It took me all of 10 seconds per rivet.
IMG_20160428_143738103.jpg
Place the flywheel, ring gear side down, on your block of wood. You don't want to break that ring gear you are harvesting. Then use the punch to drive the rivets out.
IMG_20160428_145037658.jpg
IMG_20160428_144520086.jpg
IMG_20160428_145422971_HDR.jpg
You may need to use a screwdriver to pry the ring gear off. One I mine I did the other just fell off.

Repeat for the second flywheel.




Clean the debris off the good flywheel and the good ring gear.

Then place the ring gear on the flywheel. There is only one way it will go the bolts are not symetrical so check before you start bolting things down.
IMG_20160428_161317770.jpg
Make sure you use lock nuts so things don't vibrate loose.
IMG_20160428_161320626.jpg
The bolts I bought were about an inch too long so I had to cut them down. It didn't take long.

START ALL BOLTS BEFORE TIGHTENING ANY! This is especially true when you are using lock nuts. You don't want to have to go out and buy new ones if you mess up.

Finally tighten all the bolts down and you are done.
Somehow the finished pic came out like this
IMG_20160428_162901873.jpg
So you have to use your imagination, because I am not taking it back off the engine just to make you happy. Yeah, you. You know who I am talking to.

If you did this right you spent about 30 minutes. IF you did it like I did - 2 hours. I had to make 2 trips to the hardware store (I broke a bolt), and search high and low for every tool I needed, then there was the inevitable finding where Heath and Gunner had run off to every 5 minutes.

Edited by MH81, April 29, 2016 - 06:41 AM.

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#2 MH81 OFFLINE  

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Posted April 28, 2016 - 09:49 PM

Thank you sir.
That's how a Briggs is done. Anyone need to do it on any other brands?
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#3 larrybl OFFLINE  

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Posted April 28, 2016 - 09:49 PM

For all my how-too's I left out all the grizzly details. I enjoyed this. I might start adding the how-to-not-too to my posts. Great How too and will be a benefit to all that breaks a perfect ring gear.  :poke:


Edited by larrybl, April 28, 2016 - 09:50 PM.

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#4 UncleWillie OFFLINE  

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Posted April 28, 2016 - 10:00 PM

Thank you sir.
That's how a Briggs is done. Anyone need to do it on any other brands?

Feel free to change the title to reflect the Briggs engine. I forgot.


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#5 boyscout862 ONLINE  

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Posted April 28, 2016 - 11:52 PM

In almost 49 years I've never changed a ring gear on anything. Good complete flywheels were always available. Thanks for the demonstration. One thing I will try, if ?I have to do one, is to drill the heads off of the rivets. I find that drilling is faster and safer than a chisel. I learned that changing upper balljoints on Chevys. Good Luck, Rick



#6 dodge trucker ONLINE  

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Posted April 29, 2016 - 05:53 AM

I have yet to run into a bad ring gear on a small engine. But have on cars before.

But I hafta ask; why couldn't you just put the flywheel that you robbed the good ring gear off of, onto your engine and called it "done"?  rather than going thru all of that?



#7 crittersf1 OFFLINE  

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Posted April 29, 2016 - 07:38 AM

I have yet to run into a bad ring gear on a small engine. But have on cars before.

But I hafta ask; why couldn't you just put the flywheel that you robbed the good ring gear off of, onto your engine and called it "done"?  rather than going thru all of that?

That was my question. Maybe Willie has a lot of time on his hands. :thumbs:


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#8 jpackard56 OFFLINE  

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Posted April 29, 2016 - 08:20 AM

I think this is the one that Uncle Willie had that the ring was similar but the flywheel itself was much thicker and wouldn't fir under the tin> I could be wrong (it happens now and again, ask my wife) :wave:


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#9 UncleWillie OFFLINE  

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Posted April 29, 2016 - 10:56 AM

I have yet to run into a bad ring gear on a small engine. But have on cars before.

But I hafta ask; why couldn't you just put the flywheel that you robbed the good ring gear off of, onto your engine and called it "done"?  rather than going thru all of that?

As was said the flywheels were different thicknesses. The pic of the different flywheels was accidentally deleted, but there was significant difference. Not only would it not fit under the tins, the coil would not have been high enough. 

 

I didn't drill them because they were not like normal rivets. They had a solid domed head and I don't have a drill press.

 

I could have bought a new ring gear, but I am too cheap. I had a parts engine with a nicely ventilated block that didn't needs it nice purty ring gear.


Edited by UncleWillie, April 29, 2016 - 10:59 AM.

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#10 UncleWillie OFFLINE  

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Posted April 29, 2016 - 12:53 PM

That was my question. Maybe Willie has a lot of time on his hands. :thumbs:

I have more sweat than money.


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#11 MH81 OFFLINE  

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Posted April 29, 2016 - 01:13 PM

I also have a Briggs with no "compression" down in the garage and it's good to know that these parts can be repurposed to keep other units alive.
Got a couple pull start Briggs that might get the Uncle Willie treatment.
And no, I don't mean I'm going to drown them in coffee. :D
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