Threads were worn on my OEM bolts.? After 200K miles, I'll forgive 'em.
Bob
On 8/31/2017 8:26 PM, Mirek Sharp wrote:
> For what it is worth, I find the original fasteners on my BT7 (and on my
> 50s/60s English motorcycles) to be of excellent quality, and unless they are
> really butchered, I will clean them up and re-use them over and over.
>
> Mirek
>
> -----Original Message-----
> From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob
> Spidell
> Sent: August-31-17 2:03 PM
> To: Healeys
> Subject: Re: [Healeys] Front Rotor/Hub Question
>
> 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.
>
> Bob
>
>
> 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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