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I suspect slightly more windings to cope with slightly more compression.
On Sunday, September 20, 2015, Michael Salter <michaelsalter@gmail.com>
wrote:
> Its a rainy day at Fox Point so I thought I would look into this to see if
> I can figure out what it is all about.
> After an extensive cross check of the component part numbers for the 25521
> and the 25578 starters I can find no difference between the parts. (There
> is some argy bargy regarding the brush springs but that seems to be a "red
> herring"). ;-)
> HOWEVER the starter with part number 25578 seems to be exclusively for the
> 1963 - '67 Austin -Healey '3000' Conv.
> The 25521 starter (used on Healeys up to 1963) was still available during
> this time, it was used on the Humber Super Snipe' the Rover 2000, and the
> Vanden Plas 3 litre 'Princess" but it is NOT specified for the Healey.
> There must have been some special requirement of the 25578 starter that
> was exclusive to the later Healey 3000 because creating a unique part was
> no small deal.
> Typically a different part number (disregarding the suffix letter)
> indicated that the part was not "correctly" interchangeable although as we
> know any Healey starter will fit and work on any Healey..
>
> Anyone got any idea what makes the 1963 - '67 Austin -Healey '3000' Conv.
> starter different from others?
>
> Note: The suffix letter is a Lucas indication of a change in the
> manufacturing process for the component and has no influence on the
> interchangeability of the unit, however it can indicate that its component
> parts may have changed and interchangeability of parts within the unit
> should be checked in the equipment specifications book.
>
> Michael S
> My Blog http://www.netbug.net/blogmichael/
>
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I suspect slightly more windings to cope with slightly more compression.<br=
><br>On Sunday, September 20, 2015, Michael Salter <<a href=3D"mailto:mi=
chaelsalter@gmail.com">michaelsalter@gmail.com</a>> wrote:<br><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D=
"font-family:comic sans ms,sans-serif;font-size:small">Its a rainy day at F=
ox Point so I thought I would look into this to see if I can figure out wha=
t it is all about.<br>After an extensive cross check of the component part =
numbers for the 25521 and the 25578 starters I can find no difference betwe=
en the parts. (There is some argy bargy regarding the brush springs but tha=
t seems to be a "red herring"). ;-)<br></div><div class=3D"gmail_=
default" style=3D"font-family:comic sans ms,sans-serif;font-size:small"></d=
iv><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-ser=
if;font-size:small"></div><div class=3D"gmail_default" style=3D"font-family=
:comic sans ms,sans-serif;font-size:small">HOWEVER the starter with part nu=
mber 25578 seems to be exclusively for the 1963 - '67 Austin -Healey &#=
39;3000' Conv. <br></div><div class=3D"gmail_default" style=3D"font-fam=
ily:comic sans ms,sans-serif;font-size:small"></div><div class=3D"gmail_def=
ault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">The 25=
521 starter (used on Healeys up to 1963) was still available during this ti=
me, it was used on the Humber Super Snipe' the Rover 2000, and the Vand=
en Plas 3 litre 'Princess" but it is NOT specified for the Healey.=
<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,s=
ans-serif;font-size:small">There must have been some special requirement of=
the 25578 starter that was exclusive to the later Healey 3000 because crea=
ting a unique part was no small deal. <br></div><div class=3D"gmail_default=
" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Typically =
a different part number (disregarding the suffix letter) indicated that the=
part was not "correctly" interchangeable although as we know any=
Healey starter will fit and work on any Healey.. <br>=C2=A0<br></div><div =
class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-=
size:small"></div><div class=3D"gmail_default" style=3D"font-family:comic s=
ans ms,sans-serif;font-size:small">Anyone got any idea what makes the 1963 =
- '67 Austin -Healey '3000' Conv. starter different from others=
?<br><br>Note: The suffix letter is a Lucas indication of a change in the=
=20
manufacturing process for the component and has no influence on the=20
interchangeability of the unit, however it can indicate that its=20
component parts may have changed and interchangeability of parts within=20
the unit should be checked in the equipment specifications book.<br></div><=
div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;f=
ont-size:small"><br>Michael S<br></div><div class=3D"gmail_default" style=
=3D"font-family:comic sans ms,sans-serif;font-size:small">My Blog <a href=
=3D"http://www.netbug.net/blogmichael/"; target=3D"_blank">http://www.netbug=
.net/blogmichael/</a></div><div class=3D"gmail_extra"><div><div dir=3D"ltr"=
><div><div dir=3D"ltr"><div></div><div></div><div></div></div></div></div><=
/div>
</div></div>
</blockquote>
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