[Healeys] Sealing Head Studs

[Michael Salter]

Hi John, just to avoid confusion here I should perhaps point out that we
are dealing with a 6 cylinder engine here and the generator mounting
bracket, which is also the front side cover, is secured by screws that
don't pass into the water jacket.
As far as I'm aware the issue with the generator mount bracket applies only
to the 100 engine and, as you say, can cause such problems. I should also
point out that all 8 rocker shaft mounting studs (not the valve cover nut
studs) on the 100 head pass through into the water jacket and care must be
taken to ensure that they are carefully sealed.

M


On Sat, Oct 16, 2021 at 11:57 AM john harper via Healeys <
healeys at autox.team.net> wrote:

> Mirek
>
> The only places that I am aware of are that the stud holes where the
> dynamo bracket fixes to the block are often not blind. I have seen
> situations where the studs have been replaced by bolts leading to a leak.
> The studs should be fitted with a good sealant to avoid any leaks.
>
> There were also threads going right through on early heads where the two
> rocker cover studs fit.
>
> Best regards
>
> On Sat, 16 Oct 2021 at 16:00, m.g.sharp--- via Healeys <
> healeys at autox.team.net> wrote:
>
>> Thanks for all the feedback, and not that I doubted anyone, I did my own
>> test.  I pulled out my spare block (lugging a spare block around for 30
>> years is the guarantee that I will never need one) and cleaned out the stud
>> holes, except for the one hole with a broken stud! I filled each of them
>> with WD-40 and let it sit for 24 hrs.  The level of the WD-40 did not got
>> down in any of them.  Also, Mike Salter pointed out to me that the head
>> stud threads have a groove machined through them, the only purpose of which
>> would be to relieve hydraulic lock from any lubricant that was applied to
>> the threads before threading them in.  There would be no need for the
>> groove if the holes were not blind.
>>
>>
>>
>> Given that, I cannot see the need to apply anything to the threads when
>> installing the studs, except perhaps for a little lubricant to assist with
>> getting them tight.
>>
>>
>>
>> Cheers, Mirek
>>
>>
>>
>> *From:* richard mayor <boyracer466 at gmail.com>
>> *Sent:* October 14, 2021 9:21 PM
>> *To:* m.g.sharp at sympatico.ca
>> *Cc:* Healeys <healeys at autox.team.net>
>> *Subject:* Re: [Healeys] Sealing Head Studs
>>
>>
>>
>> There are no head studs that go into coolant passages.
>>
>>
>>
>> On Thu, Oct 14, 2021 at 2:36 PM m.g.sharp--- via Healeys <
>> healeys at autox.team.net> wrote:
>>
>> Has anyone out there had issues with coolant coming up the head studs?  I
>> have heard that some stud holes in the block are blind, but some intercept
>> coolant channels and that the head studs that go in these holes need to be
>> sealed.  Does anyone know which holes are blind and which are not?
>>
>>
>>
>> Thanks for any insights.
>>
>>
>>
>> Mirek
>>
>> ’59 BT7
>>
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