Low speed drum

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Model T Ford Forum: Forum 2012: Low speed drum
Top of pagePrevious messageNext messageBottom of page Link to this message  By Arthur J. DeLorenzo on Friday, May 11, 2012 - 02:47 pm:

I have a low speed drum with a groove.023 deep caused by a rivet. How much metal can I safely remove to smooth the band surface,or should I just ignore it and reassemble the transmission? The other two drums show no sign of excessive wear


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Friday, May 11, 2012 - 03:00 pm:

You either need to use it as is or replace it. Removing metal will weaken the drum. The groove won't hurt anything.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dave Huson, Berthoud, Co. on Friday, May 11, 2012 - 03:12 pm:

Arthur Deloreazo:

What ever you do don't machine the surface down to get rid of the groove, they are already too thin. Machining Drums NOT kevlar is what breaks so many drums. I have never heard of a
drum coming in half because of the rivet grove. In fact I have heard some very good T mechanics say the grove just gives you more oil.
This is what happens to machined drums.

cracked drum


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jim Patrick on Friday, May 11, 2012 - 03:29 pm:

I agree that the groove will cause no harm and should be left alone. Just be sure the groove has no raised sharp edges that can cut your lining. If any portion of the groove is sharp, I would knock down and smooth out JUST the raised sharp edge with 220 grit sandpaper, but that's all. Jim Patrick


Top of pagePrevious messageNext messageBottom of page Link to this message  By Arthur J. DeLorenzo on Friday, May 11, 2012 - 03:56 pm:

Thanks for your advice Royce,Jim,Dave
Art


Top of pagePrevious messageNext messageBottom of page Link to this message  By Harold Schwendeman - Sumner,WA on Friday, May 11, 2012 - 04:00 pm:

Royce & Jim - I think maybe a groove like that compares to something that used to occur with the old brake drums on modern cars back in the '60's, '70's, '80's with riveted brake shoe linings. As soon as a mechanic saw such a groove, he'd insist that the drum had to be turned. I used to tell them to just leave it alone, it's a nice perfectly smooth groove and it won't hurt a thing, and any time you remove metal from a drum by turning it down, it will have more of a tendency to become out-of-round. The brake shoes within that drum will work just fine, and in fact, as soon as the new brake shoe lining wears to conform to the groove, it actually adds just a bit more surface area which also doesn't hurt. Now then, a drum out-of-round, now that's something else again and must be addressed.

Back in the days of "drum brakes", I believe it became illegal for a shop to re-install a brake drum with such a defect, which I always thought was ridiculous, but then that's just an example of the fact that we have entirely too many laws!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Harold Schwendeman - Sumner,WA on Friday, May 11, 2012 - 04:03 pm:

Sorry Dave,....I should have addressed my comment to Royce, Jim and Dave as Arthur did!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Friday, May 11, 2012 - 08:27 pm:

Thats a good one Dave, if anyone makes fun of my grooved drums I will inform them that they are for "extra oiling" LOL!

I don't have any pictures but the drums in my '15 have deep grooves from the brass plated steel rivets in a crappy set of reproduction bands. Check your band rivets with a magnet.


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