NEW TRANSMISSION DRUMS

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Topic author
speedytinc
Posts: 3840
Joined: Fri Feb 12, 2021 12:24 pm
First Name: john
Last Name: karvaly
* REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
Location: orange, ca
MTFCA Number: 14383
Board Member Since: 2020

NEW TRANSMISSION DRUMS

Post by speedytinc » Fri Feb 12, 2021 2:46 pm

Looking for feed back on these new drums from people who have ACTUALLY run them a while.

Just finished a motor re-rebuild for a customer. motor had around 2000 miles since 1st rebuild. There were other unrelated issues. tranny drums had quite a bit of wear. (not rivets). Running wood bands. I assumed the last guy didnt address them during the rebuild. to my suprise, all 3 were new ductile drums. my first experience with non original drums. I have run original restored drums well over 10k miles with kevlar that show no wear. Between drums, metal deposited/transfered from drum faces to gear flanges.
Turned drums, none ran perfectly square, have seen way worse. took .005 -.008 to clean and square. they were nasty to cut. i normally use a sharp carbide cutter. they didnt like that. tried hi speed cobalt cutter - better. cut like T-0 aluminum as opposed to T-6. very soft. ended up grinding & smoothing.
balance was close, as expected with a C&C part.
I contacted a mfg of this type of drum. he could not confirm a hardness, & never got back to me on the subject.
could be soft drums, metal shavings between band & drum, wood band material, a combination. ????
any similar experiences?

Looking for feed back on these new drums from people who have ACTUALLY run them a while.


Jack Putnam, in Ohio
Posts: 385
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First Name: Jack
Last Name: Putnam
Location: Bluffton, Ohio
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MTFCI Number: 13353

Re: NEW TRANSMISSION DRUMS

Post by Jack Putnam, in Ohio » Fri Feb 12, 2021 3:13 pm

We need to know which new drums are you asking about?


Topic author
speedytinc
Posts: 3840
Joined: Fri Feb 12, 2021 12:24 pm
First Name: john
Last Name: karvaly
* REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
Location: orange, ca
MTFCA Number: 14383
Board Member Since: 2020

Re: NEW TRANSMISSION DRUMS

Post by speedytinc » Fri Feb 12, 2021 3:55 pm

dont know exactly. there is no name on them. i believe they are new ductile iron. i dont want to take a guess & wrongly call out anybody.
that dosent change the question.

Looking for feed back on these new drums from people who have ACTUALLY run them a while.

If you have run any of the new drums a bunch of miles & looked at them, contribute. if you know who made them , identify the manufacturer. maybe your supplier makes a better drum. thanks - john

User avatar

DanTreace
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First Name: Dan
Last Name: Treace
* REQUIRED* Type and Year of Model Ts owned: '23 cutoff, '25 touring, '27 touring
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Re: NEW TRANSMISSION DRUMS

Post by DanTreace » Fri Feb 12, 2021 5:35 pm

John

Installed new J&M ductile cast iron drums in my '27, and used new wood linings as choice since the drums were new.

Some wear noticed using wood linings. Had about 6K on these when I pulled the wood linings. The worn low band wood lining was the reason to pull the bands.

Changed to Kevlar, and on inspections after another 3K, drum surfaces haven't changed from this photo of the wood linings being removed. Think the wood is harder on the metal, as only small oil grooves to feed oil. The woven Kevlar drinks oil.


IMG_98fpg.jpg
Note lines worn in low drum surface, not real deep, but could feel with fingernail passing over.
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford


Topic author
speedytinc
Posts: 3840
Joined: Fri Feb 12, 2021 12:24 pm
First Name: john
Last Name: karvaly
* REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
Location: orange, ca
MTFCA Number: 14383
Board Member Since: 2020

Re: NEW TRANSMISSION DRUMS

Post by speedytinc » Fri Feb 12, 2021 6:23 pm

thanks dan. thats what i found. could be the wood bands. One of the issues was hard pedal pressure & grabby when hot. I replaced the wood with old scandia. not a fan of wood. i can see advantages in the montanna 500, but not a touring T. (just a personal opinion, hold your fire).
I am hesitant to use kevlar on customer motors. seen to many cracked drums from operator error & folks overadjusting &thinking you adjust for pedal travel, Even after stern warnings. one guy did it twice. I, myself run kevlar in all my T's.
I believe religiously that kevlar must be adjusted with the engine running. I run outside band adjusters on all pedals personally. tighten untill you hear the tripple gears just starting to growel (the slightest change in sound). then back off 1/2 turn. thats perfect. more drags, less is wasted pedal travel.
of course this method works for any band material.

i may have just awakened the beast.


Bryce
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Location: Peoria AZ

Re: NEW TRANSMISSION DRUMS

Post by Bryce » Sat Feb 13, 2021 11:49 am

Not to nitpick something but to educate "as expected with a C&C part." the term is CNC and stands for computer numerical control.
I just retired form 35 years of repairing them.

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