Re: IML: crankshaft pulley repair

["Frederick Joslin" <fljoslin@xxxxxxxx>]

I believe that a harmonic balancer for a forged crank 361/383, for example,  will work on a forged crank 413/440. These are internally balanced engines and the balance on the balancer is neutral. Once you start getting into the cast crank engines (1971 and later)  you need a balancer for the cast crank which actually helps balance the engine. The cast crank balancers will have weights welded on them.

The same discussion holds true for torque converters at the other end of the crank shaft.  Also, not related to Imperials, but I believe that the 440 6 pack engines had a forged crank and external balancing. 

The answer is trry to get a balancer which looks like the original.

----- Original Message -----
From: "Kenyon Wills"
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: crankshaft pulley repair
Date: Wed, 11 Oct 2006 09:56:55 -0700 (PDT)


I'll answer what I know and leave the rest alone:

The part in the center is a small metal ring that
bolts to the crank. The outer part that has the
timing mark scribed on it is connected to the inner
ring with rubber, and this rubber goes bad after time.

It is my undertanding that all of the pulleys are
pressed or welded together and are steel only. they
seperate from the harmonic balancer and could be
replaced with similar from a different engine with no
problem.

That means that the pulleys and the balancer are
different issues.

It seems to me that the balancer would balance the
crank and dampen shock. It has a woodruff key so can
only be oriented one way, and thus "wants" to be lined
up in a certain way with the crank. As the crank
spins, it would "want" to be balanced and "should"
match the crank, right?

Someone that knows better can answer 2 questions?:
"is the harmonic balancer something that is particular
to a crank-shaft"

"to what degree are they interchangeable?"

I have not researched this, but there might be info
in the FSM or the MTSC sections of the website. Would
be interesting to know....

---

If it is your pulley(s) that have failed, and your
balancer was not affected, you should just have an
issue replacing pulleys, and the balancer isn't part
of the problem (?).

Therefore, if you have replacement pulleys that do not
match the ones that failed (diameter, offset, or
bolt-hole spacing), you have an incorrect part.

Imperial parts can be devilsh to match up. AC, non
AC, year, model, etc seem to vary, even within the
same year. It's a LOT harder to do right from the
parts-man's perspective than it looks, so patience and
highly detailed descriptions are often required.

I probably mis-read your email, but is sounds to me as
if Bob simply missed on his first try.

You could take your clapped-out unit and put it on a
photo-copier and then use that to fax the bolt pattern
to him. Measure the other dimensions and draw them on
the same page. That's how I'd go anyway.

-K





--- barrypk1@xxxxxxxxxxx wrote:

> Has anyone had experience repairing a ripped out
> rear crankshaft pulley? My 63 Southampton exoerienced a failure of the rubber
> mounting ring inside the a/c-alternator double pulley. I sent away to Bob
> Hofmeister for a used pulley, but found that the holes for mounting it on
> the harmonic balancer did not line up. A
> couple of questions: Why are the mounting
> holes
> unequally spaced? Is that a way to balance the pulley with the harmonic
> balancer? Is it true, as Kenyon may have intimated, that the pulleys are
> mated to the balancer as a pair?
>
> Damper Doctor says they can revulcanize my pulley,
> but if they do, will it be in balance? Since the old rear double-pulley is
> broken off the shaft of the double front pulley, it may not be possible to
> revulcanize it in exactly the same position on the shaft. Is that a problem?
>
> Has anyone any exoerience with Damper Doctor's work
> on this type pulley? I have concerns about sending away the only pulley
> that seems mated to my engine.
>
> Thanks,
> Barry
>
>
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Fred Joslin