Metric Threads Still

[AlfaNeely@domain.elided]

       You are correct about the large bolts that attach the trailing arms
and the upper front A arm link.  These are about the largest on the Alfa
spider, but are all rather specialized, especially the stepped one at the
rear of the trailing arm that does double duty of attaching the trailing arm
and the sway bar link.

      Just to help fill your brain with trivia, the largest nut I have found
on an Alfa is the nut that holds the VVT mechanism to the front of the intake
camshaft on spiders from about 1980 and later.  The nut takes a 55 mm end
wrench.  The workshop manual shows a huge crowfoot with an Alfa part number.
The threads it attach to measure approximately 49mm.
      When I built my 84 race car, I wanted to dial in the intake cam timing.
 There is little space between the front of the cam and the head.  The
machinist friend who helped build the car made me a huge end wrench from an
old truck spring.  He even painted it and stamped it with the Alfa part
number from the shop manual.  It is not a crows foot, but has an end that
accepts a cheater bar.  Torque is something link 150 foot pounds, but I just
make it tight.
Ciao,
Russ
PS, I know most of your books only go through about 1972.  However, do you
know exactly when Alfa went to the VVT intake cam?  I have a late Spica
engine with the VVT.  I guess I could look at the serial number on the engine
fro guidance.  The engine does have four separate butterfly throttle plates
rather than the 80 & 81 single butterfly, but is quite common to back date
that.

In a message dated 10/26/2001 6:00:33 PM Central Daylight Time,
johnhertzman@domain.elided writes:


> Subj:metric threads (still)
> Date:10/26/2001 6:00:33 PM Central Daylight Time
> From:    johnhertzman@domain.elided (John Hertzman)
> Reply-to: <A
HREF="mailto:johnhertzman@domain.elided";>johnhertzman@domain.elided</A> (John
Hertzman)
> To:    alfa-digest@domain.elided
> CC:    AlfaNeely@domain.elided
>
>
>
>
> I thank Russ Neely for forgiving me my ignorance of Bosch fours and their
> extra 7 mm fasteners, which is very likely to persist unless (or until?) I
> fall for a Twin Spark to insert in a Sport Sedan.
> He adds that bBolts larger than 12 mm seem to be rare on the Alfa.b Rare
> indeed, but 105.41.25.326.00 is a 14 x 1.5 mm (DIN fine) at the front of
> the rear radius rods, 105.48.25.319.00 is a very special one with two-stage
> nutting 16 x 1.5 mm and 10 x 1.25 mm at the rear of the radius rods, and
> 105.00.21.305.01 is a more conventional 16 x 1.5 at the inner end of the
> upper arm in the front suspension. Big nuts are a bit more common, with 18
> x 1.5 and 20 x 1.5 (with its own Palmutter) showing up in the suspension
> and driveline. Donbt know about the cranknut, but its not a piker. Donbt
> know the thread-pitch of the 40 mm plugs at the front and rear of the
> heads, but they wouldnbt count as fasteners anyway.
> Donbt know what the later cars might have; my parts books (and the
> usefulness of the information in them) falls off rapidly after 1972, as
> does my interest in them, with a very few exceptions..
> Cheers
> John H.
> Raleigh, N.C.

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