brake drum hole size

[luvrbus]

My granddaughter did something I no longer get the ads only the ones at the top now that are paid advertisers   

[buswarrior]

The garbage ads allowed by the site will be its end. Just as many before.
Sad to hear but the dam fact.

Have a good day
Later!

We are an income stream.

[Dave5Cs]

LOL Clifford yea Granddaughter!

[sledhead]

all's good when I get to the point of installing the wheels on the drums I will.

after all what is the worst that can happen !

it wouldn't be the first time a set of duels went flying down the highway

   dave

[uncle ned]

On cars and big trucks the hub centered wheels and the lug centered wheels have different size holes and studs.  according to my truck owner friend .

I talked to him about the super singles he ran on his trucks,
He told me the price of the wheels and tires.

I told him I would just buy mine from the midnight supply store.

That is when he told me about the size of the studs on Huggy and hub centered wheels.

uncle ned

[sledhead]

UPDATE

so all is back together and I went for a drive to see how everything was doing . had some vibration on the passenger side ? not bad but it was not there before the repairs ?
when I installed the wheels back on the coach I tried to keep the drums centered as much as I could but the driver side was close and the passenger side moved by the time I had the wheels torqued ?
after I returned home I removed the passenger wheels and the drum was off center . so after scratching my head I made 8 x 3/4 " nylon hose spacers 4 " long and slid them through the drums with the parking brakes off on 8 of the 10 bolts before I put on the 1st set of wheels removing the spacers 1 at a time as I installed the studs . torqued them down and put on the outside wheel and torqued that as well .
went for another drive and the vibration is gone ?? so now I will redo the drivers side as well and have to carry the spacers with me in the coach just in case they are needed with a flat .

so no they do not work as they should ... just another good enough fix by the parts supplier to not make the drums like they were made back in the day .

but the brakes work better then before and I like the new truck muffler 

dave 

   

[chessie4905]

That shouldn't effect balance. Wheels were mounted in different indexed position than before? New drums aren't balanced?

[richard5933]

Would kind of make sense - if the holes are enlarged in all directions it would be possible for the drum to be slightly off center.

Are you using the screws that hold the drum to the hub?

I'm wondering if those drums are being designed for use with hub piloted wheels. If so, they rely on piloting tabs on the hub to center the brake drum.

If the drums have holes too big for the studs and your hubs are stud centering, then it's touch to get things lined up.

Here's something I found that sounds similar to what you did, but it is more permanent.

https://www.tru-bal.com/brake-drum-spacers

They have a video on their site which shows what can happen if the alignment tabs for the drum wear, which sounds like the problem you're having since you don't have the tabs at all.

[chessie4905]

The hub bore is the same for stud piloted and hub piloted . One uses a metric dimension and the other in inches, but do the conversion math. Both are same size.

[richard5933]

The hub bore is the same for stud piloted and hub piloted . One uses a metric dimension and the other in inches, but do the conversion math. Both are same size.

But, on a stud piloted hub what would be there to align and center the drum? Doesn't a hub piloted hub have the tabs sticking out to do this?

[chessie4905]

Find a GM listing for two different hubs.

[sledhead]

Richard thanks for the link !
that is the fix I need and will call them to make sure I get the right one's . but for now I redid all the drive wheels and the ride is
smooooooth with out the vibration . I did ask my parts guy back when we got the drums and he did not know of any spacers ? Now I will send him the link

thanks   dave

[luvrbus]

Find a GM listing for two different hubs.

MCI used the same hub for pilot and hub centering since the 70's,now the new drums are made to fit both,lol I had 2 packs of those spacers that came from a MCI order and never knew what they were for but they were not needed on my MCI

[sledhead]

The plot thickins
I told my parts guy about the spacers and he told me about bud nuts that he can get that have the washer / spacer built on the nuts / bolts ? so I have not seen them yet but he tells me that they are not that much $$$ so I stuck my neck out and told him to order a set of LH and a set of RH with new nuts as well ? I hope his idea and my idea on not to much money are the same ? I should know more by the end of this week , will let you know

   dave

[chessie4905]

Is he talking about these?
https://www.lawsonproducts.com/lawson/Right-Hand-Inner-Cap-Nut-for-Dual-Aluminum-Wheels/62437.lp