According to the Rootes parts book, from the Series III through Tiger
production, there were three sevro units used:
Series III and IV up to B9402898 ST, B9402920 GT used a 5" unit that
had the clip on type air filter.
Series IV from B9402899 ST, B9402921 GT up to Series V B395004057 and
Tiger I and IA up to B382001284 used a 5" unit with the screw type air
filter.
Series V from B395004058 and Tiger IA from B382001285 and Tiger II used
the 7" unit.
The 7" unit was not a Tiger II only servo. My Tiger IA has one.
Jim
Steve Laifman wrote:
>
> DJoh797014@aol.com wrote:
>
> > The 5" and 7" servos are the same for Tigers and Alpines.
> > Be careful rebuilding it. Follow the instructions and you'll
> > have not problem.
> >
> > Dave Johnson
>
> Dave,
>
> Hate to disagree, but.... The 7" MkIIA was a Tiger MkII
> fitting, and is a tight squeeze, with some bolt-on mount
> bending required. It is so close that you really have to watch
> the vacuum hose routing and make it along the firewall. BTDT.
>
> There are also differences in the boost ratio amongst the
> various Girling, and especially Lockheed replacement units,
> ranging from 2:1 to 3:1. Watch the casting on the servo for
> primary and secondary bore sizes, if present. Your Master
> Cylinder should of course, be stock. Changing that to one of
> the various Alpine units can make life easier without the
> servo, but but you thru the windshield when you get too much
> boost, and a different pedal travel.
>
> Don't know all the internal workings, and may be wrong about
> boost ratios amongst the same diameter Girling, but know that
> the Lockheed units can be quite different. I prefer 3:1. with
> the stock M.C.
>
> Actually, my son Jay has done the most extensive work in this
> area, and has sent e-mails on the subject. I'll forward it as
> soon as I can find where I filed it.
>
> Steve
>
> --
> Steve Laifman < Find out what is most >
> B9472289 < important in your life >
> < and don't let it get away!>
>
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