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Disk Brake assembly questions

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John Loftus

John Loftus

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Hello wise ones,

I've been trying to figure out the correct assembly for the bolts and washers used for the dust cover, adapter plate (that holds the caliper), steering lever and spindle. The factory illustrations are confusing since the dustcover is only shown with the brakes, not the suspension parts. On top of that, the P.O. had the locktabs on the steering arm side so I can't go on prior assembly. I've taken a picture of things loosely assembled so please refer to it below.

The Moss illustration show two locktabs and the factory parts book shows one. I believe the sequence for the bottom two fasteners are bolt head, locktab, dust cover mounting tab, shakeproof washer (to fill the small recess in the adapter plate), adapter plate, spindle, steering arm, lockwasher, nut. correct? The top two would be the same except no steering arm and perhaps substitute a washer for a lock tab. One of my locktabs is straight (shown in photo), the other has a conical bend in the middle but the hole centers are correct. Does anyone know a source for the lock tabs?

Cheers,
John
dustshield_lores.jpg
 
John, I have been wrong before but I think the lock tabs should go on the nut side of the assembly not the bolt side.
I do think the bolts are going the correct direction .Bob
 
Hi BR,

That would make sense to me but the parts factory book is very clear that the lock tab goes under the bolt head. I suppose this is to allow one to replace steering parts or check torque on the steering lever bolts without removing the hub?

locktabs.jpg
 
Guess I put mine on wrong. And wrong they will stay !
I thought they would be to prevent the nut from coming loose. Thanks Bob
 
john loftus,i also have a 1963 bj7,while rebuilding my front end this summer i discoverd the p.o. had not bothered to have the tabs replaced on one side and broken up on the other , i made my own sets up,two per side,making sure that they went back on the bolt head side as you said to prevent the bolt from spinning when removing the nuts,as is also illustrated in the moss diagrams under 'front suspension' /ubbthreads/images/graemlins/yesnod.gif
 
John- I am attaching a photo I made of my front axel assembly before I took it appart. Maybe this will be helpfull.
 

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Perhaps your all correct. The Moss catalog probably illustrates applications for all models whereas the BMC parts illustrations are for the very latest (at time of printing) applications. I've always found the tabs are placed under the nuts, however, if there are no nuts a tab under the bolt head makes sense! I can't believe I just said that!
BTW you did a great job cleaning up the parts, including the bolts. They look to be zinc plated. Great photo it should be archived for future reference.
/ubbthreads/images/graemlins/cool.gif
 
Not Perhaps Johnny,Johns interpretation is correct and this application is unique on the car.However, because I hate those straps I replaced those bolts with drilled, hardened, hexheaded bolts and safety wired them following Jaguar's assembly techniques.---Keoke
 
Hello Johnny, it's alright to say things like that, get used to it there will be more of them to come.
Hello Keoke, couldn't agree more i safety wired all mine too. I don't make lock tabs anymore.
Hello John Loftus,I'm not sure i agree with the placing of the shakeproof washer which as you said was "to fill the small recess in the adaptor plate". If there is a shakeproof washer it should be under the nut not the bolt head and so what is it going to do in the recess?. If you are putting this together with new hardware and using the shakeproof washers then make sure the nuts you use are not hardened or as people say "grade 8". The idea of the shakeproof washer is it supposed to "bite in" to the nut and the part it is clamping thus preventing the nut from turning. Why would you want to "check torque on steering lever bolts" for?. Once they are assembled/torqued and locked why would you want to recheck the torque? I would definately go by the parts manual but there again it may only give a generic picture and may not pertain to individual cars that may have been built differently. Certainly better than the Moss pictures. Safety wiring needs to be done right also Regards, BUNDYRUM
 
john loftus,hope you wont mind a little bit more confusion on this subject,i reolized i had the front end of a 100 in my shop i was very surprised how easily the nuts and drum came off revieling new looking brake cyls.check attach. since this is a drum brake model it just has one (1) tab on the bottom,and zero (0) inside,who knows what the p.o. might have done,so now on my bj7 i have washers and lock nuts outside,and a tab on both top and bottom on the bolt heads inside.sure looked that way to me on the moss diagram. /ubbthreads/images/graemlins/smirk.gif by the way moss diagram shows lock tab #92 upper is for a bn1-while lock tab same number,#92 lower,clearly inside bolt head,is for subsequent models,any virgin healeys around? /ubbthreads/images/graemlins/cryin.gif
 

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attach."swimming pool healey" inside of 100 drum,no tabs. /ubbthreads/images/graemlins/hammer.gif
 

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[ QUOTE ]
attach."swimming pool healey" inside of 100 drum,no tabs. /ubbthreads/images/graemlins/hammer.gif

[/ QUOTE ] Can't see them with the hub on Anthony---Keoke
 
[ QUOTE ]

I'm not sure i agree with the placing of the shakeproof washer which as you said was "to fill the small recess in the adaptor plate". If there is a shakeproof washer it should be under the nut not the bolt head and so what is it going to do in the recess?.

[/ QUOTE ]

Hi Bundyrum,

The assembly as shown in the parts book is very counterintuitive. I agree with all you say yet take a look at the following illustrations (same in my parts book and Moss catalog, btw) The No. 10,11 (or 26,27 parts book) is a shakeproof washer and No. 8,9 is a plain washer. Seems like quite a few Healeys have been reworked with the lock tabs on the nut side and who knows what combination of washers around the dustcover mounting tabs. I asked this question on the Healey list too but the dearth of responses means I'll take my best guess, I guess!

dustcoverwashers.jpg
 
[ QUOTE ]
John- I am attaching a photo I made of my front axel assembly before I took it appart. Maybe this will be helpfull.

[/ QUOTE ]

Hi Richard,

I've seen quite a few with the locktabs on the steering lever side like yours. Maybe the assembly was revised but not the parts book? Looks like yours has been apart before .. appears to be cap head bolts holding the spring pan?

Cheers,
John
 
[ QUOTE ]
They look to be zinc plated.


[/ QUOTE ]

Hi Johnny,
The zinc plated is with the Caswell Copy Cad kit. There is a long thread in the tools forum with more pictures and info.

Cheers,
John
 
[ QUOTE ]
Johns interpretation is correct and this application is unique on the car

[/ QUOTE ]

Hi Keoke .. thanks for the vote of confidence .. I was starting to worry that I couldn't read a parts diagram anymore! What's your take on the placement of the shakeproof washers?

Cheers,
John
 
[ QUOTE ]
any virgin healeys around?

[/ QUOTE ]

maybe only born-again virgins like mine /ubbthreads/images/graemlins/grin.gif

Hi Anthony,

Thanks for the feedback and pictures .. perhaps you should use a slightly smaller hammer next time? Looks like that lower link was not cooperating!?! /ubbthreads/images/graemlins/hammer.gif

Cheers,
John
 
keoke,your right,for some reason i couldnt up load the picts.of the one thats totaly apart,you cant realy tell from the picts. how well preserved the brake cyl.on these little gems are preserved.and the spindles must have been replaced at some point because they also look as from the factory,to bad i dont own a 100.id recently seen a 100 steering arm on ebay go for $200+ guess this stuff is worth something to someone,im satisfied that i put lock tabs on both top and bottom on my bj7 when rebuilding the front end,cant hurt.to quote blueridge1 "and wrong they will stay" /ubbthreads/images/graemlins/yesnod.gif
 

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John - You may be right. This car came from the factory without dust shields. The dealership where I bought the car added them after the brake pads woreout before the car was a year old.
 
john,just used the hammer to tap around the drum,it actually fell off with 2-3 light taps,very clean inside considering it had been sitting in the remains of an abandoned cement swimming pool for 40+ years,the lower link had to be cut to remove the assembly from chassis,that was the only part not salvaged,the drums appear to have never been cut.good luck on your rebuild /ubbthreads/images/graemlins/hammer.gif
 
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