The simple solution is to just make your own mark. Set TDC #1 and make two
marks in an easy to see position...
Dave
Frogeye@SWCP.com Taos Garage Annex in Albuquerque
'62 BT7 MK II, '54 BN1, '62 Fiat 1600S
http://www.britishcarforum.com/TaosAnnex.html
----- Original Message -----
From: "Blue One Hundred" <international_investor@yahoo.com>
To: "Dave & Marlene" <rusd@velocitus.net>
Cc: <jbpate@attglobal.net>; "Healey" <healeys@autox.team.net>
Sent: Monday, December 13, 2004 6:45 PM
Subject: Re: timing mark on pulley
> Barry / Dave -
>
> BN2s don't have a harmonic balancer, they just have a
> pulley. Part of the reason the cranks break at the
> 2nd bearing from time to time.
>
> Late BJ8s are the only healey that has the harmonic
> balancer attached to a rim which is a cast part of the
> pulley... this means the round dimple, which is
> drilled into the face of the harmonic balancer (not
> the pulley), and sometimes on the edge of the
> balancer, can in fact shift position over time because
> it is attached to the pulley with a rubber vibration
> ring. To be honest you don't ever want to be taking a
> timing measure off of this round dimple.
>
> There should be a little notch cut into the edge of
> the pulley itself, that should be the only thing you
> take a timing measure from. It is hard to see, but
> with enough light and patience you will find it.
>
> I hope that is clear. Please write back if you have
> more questions.
>
> Regards,
>
> Alan
>
> '53 BN1 '64 BJ8
>
> --- Dave & Marlene <rusd@velocitus.net> wrote:
>
> > Hi Guys,
> >
> > My front pulley also has a small dimple to indicate
> > TDC.
> >
> > I can't imagine that a "small round dimple" would
> > have much effect on
> > balance. It would weigh about .026 gm. At a radius
> > of three inches this
> > would be about .0023 oz/inches. The balance
> > tolerance for very serious race
> > engines turning 9,000 rpm is only .02 oz/inches. The
> > effect of the
> > dimple would only be about 1/9 of what the balancer
> > could detect.
> >
> > Dave Russell
> > BN2
> >
> >
> > Blue One Hundred wrote:
> > > Barry -
> > >
> > > That round dimple is what the machinist does to
> > the harmonic balancer
> > > to balance it. It has no relation to TDC.
> > >
> > > I am very suprised that your pulley does not have
> > a notch in it. It
> > > is very small and hard to see... try looking for
> > it with ALOT of
> > > light in the engine compartment, rotating the
> > motor either with a big
> > > wrench on the dog nut, or putting the car in 3rd
> > or 4th gear and
> > > rolling it on the floor bit by bit... which
> > should rotate the motor
> > > till you see the notch.
> > >
> > > I'm sure the notch is there... it's just hard to
> > see. Mark it with
> > > paint when you find it.
> > >
> > > Regards,
> > >
> > > Alan
> > >
> > > '53 BN1 '64 BJ8
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