Dog ring removal - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 24 (permalink) Old 08-26-2018, 02:42 PM Thread Starter
eas
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Quote:
Originally Posted by Jim G View Post
I don't use the ring to press the dog gear off.

Take your bearing press tool and fit the lip into the groove of the dog gear and tighten it with a wrench. Put the slot in the dog gear in the center of the space between the 2 halves of your press tool.

I've pressed hundreds of this way and never broke one.
You must have the bearing separator lip the exact diameter of the groove in the ring to make it work. If I were to do this often, i would invest in a special tool mentioned above.

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post #17 of 24 (permalink) Old 08-26-2018, 02:53 PM Thread Starter
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Originally Posted by Chas H View Post
Using the snap ring would work better if the part was rotated 90 deg in the clamshell. You were pulling right the weakest area.
I have a special tool for pulling the dog ring off Porsche gears-I should check to see if it fits Alfas.
Tried that too. I actually broke another ring from a different part and this time not from the weak area.
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post #18 of 24 (permalink) Old 08-26-2018, 03:57 PM
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Quote:
Originally Posted by eas View Post
You must have the bearing separator lip the exact diameter of the groove in the ring to make it work. If I were to do this often, i would invest in a special tool mentioned above.
I do not have a special tool.

I have the same style bearing separator as you do. I bought off the tool truck 30 years ago.

I have 30 years of doing it like I posted. Never broke one. Make sure you tighten it up each thread rod tight with 2 wrenches.

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post #19 of 24 (permalink) Old 08-28-2018, 01:55 PM
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Here are some pictures of how I do it.
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1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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post #20 of 24 (permalink) Old 08-29-2018, 10:34 AM
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Hello to everyone that has posted.
I've been watching this post from the start and I'm wondering, if a good bearing puller that FITSthe snap ring groove like Jim G is using to pull the dog ring from a gear then what does it matter if the dog ring cracks or brakes at the groove. The dog ring is going to be replaced with a new one anyway. It seems as if getting the dog ring off of the gear and leaving the gear serviceable is the goal here. I'm not sure anyone would pull a dog ring from a gear then reinstall it. There would be to much of a chance for deforming or fracturing the dog ring making it unserviceable. Lastly, I would say this, do not use the synchro snap ring in any way in the process of dog gear removal. I believe y'all are doing it this way anyway. I was just thinking out loud, Chief

P.S. ramblings of an old Alfa mechanic

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post #21 of 24 (permalink) Old 08-29-2018, 12:15 PM
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I'm an old Alfa tech that learned the tricks of rebuilding gearboxes from the older Alfa techs who started working on Alfas in the 50's and 60's.

If you have a gearbox that is only grinding second. You can swap the 2nd gear dog teeth for 5th gear dog teeth and not have to buy a gear.

Your not going to deform a dog gear by pulling it off.

Alfa mechanics have been rebuilding gearboxes and transaxles like this for many decades.

Like I said earlier I have pulled hundreds of dog teeth off gears from both 105 and 116 series using a bearing separator and reinstalled them on other gears by heating them up.
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post #22 of 24 (permalink) Old 03-05-2019, 06:42 PM
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Quote:
Originally Posted by Jim G View Post
....Your not going to deform a dog gear by pulling it off. Alfa mechanics have been rebuilding gearboxes and transaxles like this for many decades. Like I said earlier I have pulled hundreds of dog teeth off gears from both 105 and 116 series using a bearing separator and reinstalled them on other gears by heating them up.
The bearing separator you show must have the exact diameter as the groove diameter in the dog tooth gear presumably? If it does not support the flange evenly around the perimeter of the groove....it can crack at the the high localized pressure points. Now this method did work for me on one dog gear (a bad one)...but not on the second one (also a bad one). I used the snap ring method ...luckily this was only a test. But I'm not going to try this on a good dog gear. So it looks like I need to find a machine shop to fabricate a special tool....that Porsche tool looks very nicely designed.
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post #23 of 24 (permalink) Old 03-05-2019, 07:33 PM
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Originally Posted by 1750GT View Post
The bearing separator you show must have the exact diameter as the groove diameter in the dog tooth gear presumably? If it does not support the flange evenly around the perimeter of the groove....it can crack at the the high localized pressure points. Now this method did work for me on one dog gear (a bad one)...but not on the second one (also a bad one). I used the snap ring method ...luckily this was only a test. But I'm not going to try this on a good dog gear. So it looks like I need to find a machine shop to fabricate a special tool....that Porsche tool looks very nicely designed.
The bearing separator I have I bought off the Mac truck 30 something years ago. I have not modified it in anyway. I only use this one for removing dog teeth gears.

The top surface of the tool must be flat. If you used one that that has slight bends or chips in it from use. This could be what is damaging your gear. Also for this job you would want a higher quality tool and not one from Harbor Freight. The separator needs to tighten up tight into the groove.

I think the curve in the jaw of the tool vert closely matches the curve of the gear. But I have not modified it at all.

Unless I'm reading your post wrong. It seems you still used the snap ring to press them off. This is why they are getting damaged.

1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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post #24 of 24 (permalink) Old 05-21-2019, 06:29 AM
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Tried Jim G's method and the dog tooth gears came right off with no damage and no issues. Even with my cheap and unmodified Chinese gear flange.

Thanks Jim
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