I popped the trans cover off my '17 and saw a groove in my low speed drum. It looks very uniform and is the same all the way around.
I was wondering if this could be a casting groove, or did a rivet do this? Otherwise it looks like I have good band thickness yet and the other bands are fine.
What do you fellers think?
It's hard to see the groove in your picture. I have seen drums with a groove cut all the way around and doesn't look like a wear groove. I don't know who made them, but if it is otherwise smooth, and not cracked, it might be good to use. See if you can find an experienced Model T person nearby who can look at it.
Probably a groove from a rivet or bare band and as long as it is from some replaced band and not the current rivets/band it should be of no concern.
Here's another pic- best I can get with 200 pixels.
Do the bands look like Kevlar to anyone else? I bought the car with these bands and they seem larger and more yellow than Scandinavian cotton.
There were no casting grooves. The bands look like replacement cotton bands, not kevlar.
They look like Kevlar to me.
If you start with your original full sized photo and crop to just the area of concern, then resize your photo and post it to the forum there will be much greater detail in your posted photo.
You can use a online resizer to do that, like:
Your photo could look like this but with much greater detail if you start with the original.
I forgot, use about 1000 x 1000 pixels and less then 194 kb when you resize.
No GROOVE, it's the parting line between the end plate and the drum. Pre 25' if late(wide drum it would look different).
Here's another pic and I isolated the one drum.
Jerome is right.
It seems to me, in the first picture, I see a crack in the low gear drum just before the end of the band at the pedal side.
James, that last picture is the brake drum. If that is the one you are referring to, that is just where the two pieces come together like Jerome said. The low speed drum is the middle one. The one closest to the flywheel is reverse.
All I see is where the driving plate bolts up to the brake drum. Normal.
Dang! That is one DEEP groove! Could that possibly affect the integrity of the drum?
It's hard to tell from a picture, but in the first photo the ends of the linings look yellow like Kevlar.
I don't think that the groove was caused by a rivet.
It is suspicious because it looks fairly deep.
Could it be that the drum is starting to develop a uniform split or crack? Or maybe because the way the lighting or shadow effect causes it to look deeper than it really is?
Perhaps backing off the low pedal adjustment and removing the spring would clearly show the surface of the low drum and what you are describing as a "groove" ? Or, are you mistakenly referring to a "groove" as the driven plate to brake drum parting line ?
Yes, my "groove" is the gap between the plate and brake drum. So all is well, case closed. Thanks to all.