[Healeys] Front Rotor/Hub Question

Bob Spidell bspidell at comcast.net
Thu Aug 31 12:03:26 MDT 2017

I was going to replace the old, OEM bolts with new Grade 8 splitwashers, 
nuts and bolts, but noticed something I hadn't considered before.  The 
OEM bolts have a long--about 3/4- inch--smooth shank, and only a 
half-inch or so of thread.  But, if you go a hardware store to buy Grade 
8 in the same, or slightly longer, length you won't find bolts this 
short with that much smooth shank.  I noticed when removing the bolts 
that they seemed to be a pretty tight fit in both the rotor and hub 
holes; I now think that this is purposeful as having tightly fitted, 
smooth bolt shanks probably help prevent any sheering motion between the 
rotor and hub.  Having a fully-threaded bolt would not prevent sheering, 
and the threads might cause fretting on the rotor and hub holes.  This 
would be similar to, but different in practice, to the 'dowel' bolts 
used in mating bellhousings to the rear engine plate.  Now, I think I 
either need to reuse the OEM bolts or buy longer, Grade 8 bolts with 
more shank and cut them to size.

No point, just an observation.


On 8/27/2017 11:01 AM, Bob Spidell wrote:
> I'll be installing new rotors and pads on my BJ8's front disks, and I 
> have the kind of question only a really anal-retentive person would 
> ask: Do the bolts that affix the hub to the rotor go in bolt head 
> outside, or inside; i.e. with the bolt head, or nut, against the hub 
> flange?  It seems like the bolt head should be outside, but when I 
> bought the car the nuts were on the outside.
> Bob

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