[Healeys] Motor Mout Bolts

[Michael Salter]

 *"So, now I can run a 3/8 - 20 UNF tap through the hole to clean it up.
So, I take it all threaded holes in the engine bay are UNF."*
I think that may be a stretch Mike ... I know, for example, that the nuts
welded into the frame for the battery hold down rods changed from BSF to
UNF as C.#156839. I would bet that there are other instances of this.
I would always recommend checking your parts book for the correct thread
for your car before running a tap through any.

M

On Sun, May 10, 2020 at 12:50 PM Michael MacLean <rrengineer.mike at att.net>
wrote:

> The only reason I asked this question in the first place was because a
> 3/8" UNF bolt screwed into all eight holes for a few threads and stopped.
> Because it was the same in all eight holes I did not want to force it.  So,
> now I can run a 3/8 - 20 UNF tap through the hole to clean it up. So, I
> take it all threaded holes in the engine bay are UNF.  Certainly simplifies
> it.
> Mike MacLean
>
> Sent from AT&T Yahoo Mail on Android
> <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature>
>
> On Sun, May 10, 2020 at 8:51 AM, Curtis Arndt
> <cnaarndt at gmail.com> wrote:
> They are UNF on my BN1 built 11 Jan. '55.  If they ever were BSF, it was
> very early in BN1 production.
>
> On Sat, May 9, 2020, 16:54 Perry via Healeys <healeys at autox.team.net>
> wrote:
>
> Michael
>
> There was a slow switch from BSF to UNF fasteners used and threads on some
> parts starting about mid 1954 through the end of 1955 at several locations
> on the 100. However I can not speak to the engine mount to chassis
> fasteners.
>
> Its one of those areas of the car that if I ended up with damage to the
> welded nut threads that could not be cleaned up with a tap I would do what
> was necessary to secure the engine mount short of replacing the welded nut.
>
> Perry
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
> *From: *Michael MacLean <rrengineer.mike at att.net>
> *Sent: *Saturday, May 9, 2020 5:14 PM
> *To: *Healeys <healeys at autox.team.net>
> *Subject: *[Healeys] Motor Mout Bolts
>
>
>
> Are the bolts that fasten the motor mounts to the frame different threads
> between the BN1 and the BN2?
>
> Mike MacLean
>
> Sent from AT&T Yahoo Mail on Android
> <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature>
>
>
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