Dog Gears, how to remove and what to look for. - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 47 (permalink) Old 07-06-2006, 08:41 AM
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Quote:
Originally Posted by JoeCab
No, Alfa has never sold the dog gears without the main gear. I don't think there are any aftermarket manufacturers of this part.

Joe
Joe -- thanks for the info. I'll look for some used 4th or 5th gears to "borrow" the dog gears.

Bill / 1977 Alfa Romeo 4C2000 / 2012 BMW S1000RR / 1975 BMW R90/6
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post #17 of 47 (permalink) Old 07-06-2006, 12:31 PM Thread Starter
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G'Day Bill,

Quote:
Originally Posted by Bill77
By the way, do you find the snap ring to be a royal pain in the arse to remove & reinstall? Maybe I have lousy snap ring pliers.
Yep, hard to open and they flex the wrong way

Lousy snap ring pliers bend

Using the socket was a good idea, the disk I used was an offcut (center out of a hole saw hole) from work.

Post some pics of your dog gears if you can (1st, 2nd, 3rd).

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post #18 of 47 (permalink) Old 07-06-2006, 03:07 PM
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My camera won't do close-ups like yours can. My 2nd gear dogs are pretty rounded off. 3rd is a little better and 1st is pretty good. Maybe the 2nd dog will be ok for 5th?

Bill / 1977 Alfa Romeo 4C2000 / 2012 BMW S1000RR / 1975 BMW R90/6
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post #19 of 47 (permalink) Old 07-06-2006, 06:22 PM Thread Starter
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Bill,

To me, 'pretty rounded off' sounds like a last resort even for fifth,replace it if you can.

I'm assuming you have a digital camera, most have a macro mode (normally a little tulip symbol) but if not you can try taking a photo from as close as you can focus then crop it to just the bit you want to show.

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post #20 of 47 (permalink) Old 07-10-2006, 05:44 AM
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Quote:
Originally Posted by JoeCab
No, Alfa has never sold the dog gears without the main gear. I don't think there are any aftermarket manufacturers of this part.

Joe
Porche Dog gears, which are similar, are available on the aftermarket. Some entreprenure shouild track down that manufacturer(of the Porche part) and see about getting Alfa dog gears manufactrured.

Regards

Ken

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ex- 1965 GTA, RHD, Corsa, Trans/Am 66-72
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post #21 of 47 (permalink) Old 11-14-2006, 02:16 AM
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Unhappy

Hi Craig,

How on earth, do you manage to separate these two parts ?
I followed your process trying several pullers, even warming the dog gear with a torch. Did not move 1/100 mm. The best I can do is to bend the clip.
I am not brave hearted enough to pull harder as I am afraid to either destroy the clip or break the retaining lip which is not too thick.
Is there a secret that you did'nt reveal ?

Cheers.
Jean-Pierre
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post #22 of 47 (permalink) Old 11-14-2006, 11:24 AM Thread Starter
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Bonjour Jean-Pierre,

First make sure that the metal disk (or socket) you are using does not sit on any part of the dog gear, it must not be greater than 49mm in diameter.

You can then try applying as much pressure with the puller as you are happy with then giving a sharp hit with a hammer to the end of the puller. This may jolt the dog gear loose.
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post #23 of 47 (permalink) Old 11-15-2006, 02:12 AM
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Thanks Craig,

BTW in my case the gearbox I'm working on is a 105 box. Therefore the max diameter of the sitting part must be 42 mm max. I'm using a 32 mm socket that fits perfectly.
I tried the hammer hit already but ... nada de nada.
May be the factory assembly is different ?
If it goes on with bad willing, I'll change the complete gear but i'm a bit afraid of a whistling noise as the new gear wont necessarily be fitted to the intermediate axle facing gear.

I'm also going to ask another question under a new title about the synchro rings. If you can help again...

Merci beaucoup.

Jean-Pierre
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post #24 of 47 (permalink) Old 11-15-2006, 12:20 PM Thread Starter
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Sorry,

I'm out of ideas.

Craig,
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post #25 of 47 (permalink) Old 11-15-2006, 03:30 PM
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I used a hydraulic press and wore a face shield and a heavy coat just in case.

Bill Sinclair
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post #26 of 47 (permalink) Old 11-15-2006, 03:57 PM Thread Starter
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G'Day Bill,

The question then becomes - what method did you use for holding each piece (gear/dog gear) ?

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post #27 of 47 (permalink) Old 11-15-2006, 07:54 PM
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Quote:
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G'Day Bill,

The question then becomes - what method did you use for holding each piece (gear/dog gear) ?
Craig,

I'm embarassed to say I don't remember. I have a couple stacks of different thickness plates sitting next to my press so I guess I used some combination so that the gear was basically hanging by the edges of the dog gear and the socket pushed down to separate them. I only tried it on a spare 5th gear just to see if it would work. Seemed to take a good bit more pressure than say, separating gears from the mainshaft. The face shield and coat was mainly in case the socket shattered.

Bill
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post #28 of 47 (permalink) Old 11-16-2006, 01:06 AM
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Bill,

Your method is usable only when the main gear diameter is smaller than the dog gear : 5th, 4th and maybe 3rd but not for 2nd and 1rst gears which are generally the ones that need overhaul.
And then again was it on an Alfetta or a 105 box ?

Jean-Pierre
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post #29 of 47 (permalink) Old 11-16-2006, 07:49 AM
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Jean-Pierre,

This was a 105, I expect that your observation applies to both types though. Fortunately the tranny I reconditioned didn't need new dog gears so I never got that far. Good luck. I hope someone else pipes up or that Craig's method eventually works. I'll stay tuned.

Bill
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post #30 of 47 (permalink) Old 11-16-2006, 09:44 AM
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Bill,

Your method is usable only when the main gear diameter is smaller than the dog gear : 5th, 4th and maybe 3rd but not for 2nd and 1rst gears which are generally the ones that need overhaul.
And then again was it on an Alfetta or a 105 box ?

Jean-Pierre
Jean-Pierre, this is true you can press the dog gears (syncro hub) off the smaller gears. I did the following for the all the gears.

I machined and bored and cut a groove to clear the the hubs teeth, in a round plate that could be put behind the spring clip and that extended past the gear teeth diameter, (larger OD that even 1st) and then set this on some v-knotched press plates and pushed against a correctly sized plug. One could also use a large puller.

FWIW

Ken

Ken Geiger, Toronto
1965 GTA, RHD, Stradale
ex- 1965 GTA, RHD, Corsa, Trans/Am 66-72
1964 Sprint GT, B-Sedan in 70's
1970 Giulia Super (CDN Spec)
1976 1600 GTj (Italian Spec)
1966 Harley Sprint (Aermacchi) 250
2000 Catalina 320, Hull #765 Northern Dream
2001 BMW Z3 3.0i

Last edited by kengta; 11-16-2006 at 09:48 AM.
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