Ferrari Mailing List: Re: Mageti Marelli S159B Distribtuor Advice Needed

[Robert W. Garven Jr. (rgarven]

I tried moving one spline over and it was off the same just on the  
other side of the mark?

On Mar 10, 2008, at 10:51 AM, Hans E. Hansen wrote:

> Sure you're not off a spline when you inserted the rotor
> shaft into the cam?
>
> Hans.
>
> On Sun, Mar 9, 2008 at 9:36 PM, Robert W. Garven Jr. <rgarven [at] gmail.com 
> > wrote:
> > Friends,
> >
> > I am having a problem and I hope one of you can help?
> >
> > I have a 75 GT4, running standard ignition with only the R1 points. I
> > had a coil wire come loose and the car ran on 1 bank for about 30
> > seconds so I decided to replace my spark plugs. While I was doing  
> > that
> > I have a Sun Distributor Machine that I have not had much time trying
> > to figure out so I decided to test my distributors. The PO had a
> > distributor overhaul and whoever it was that did the work hot rodded
> > my distributors leaving in only two advance weights for each unit.  
> > The
> > car always ran very well so I kept it like that, however the two  
> > units
> > were so out of spec that I decided to replace them with a set of
> > rebuilt distributors I got from TR about 5 years ago, thinking that
> > this would solve all my problem and I also wanted to see how the car
> > would perform with factory specs. I spent two days checking them and
> > learning how to use the Sun ( which was pretty easy) and everything
> > seemed fine, they were a little off but within factory specs. They
> > were rebuilt very well by a well know expert and the points were all
> > centered etc. Even though I had marked everything when I took my
> > original distributors off I decide to make double sure I put them on
> > right and rolled the engine around to the PM 1-4 for the rear unit  
> > and
> > PM 5-8 for the front one.
> >
> > This is where I noticed something weird. The rotor lined up sort of  
> > to
> > the line up mark but not as close as the units i took off? Below is a
> > picture. When I bought them they did not come as a matched set as  
> > they
> > were supposed to all be rebuilt to the same specs, and I assumed that
> > the units were identical. I tried to time the engine but both of the
> > distributors seemed to be so far off i could only get a glimpse of my
> > timing marks when they were at their extreme rotation. The only
> > difference between my units and these are mine had a red label and
> > these were silver with red lettering, however both say S159B. What is
> > weird is the front set needed to be rotated extremely to the left and
> > the rear set to the right so next week I will try to switch them. I
> > this does not work I will try to move their weights into my original
> > distributors.
> >
> > What my question is are these splined shafts identical for the front
> > and rear distributors or are the different, or could the later one
> > have a different spline due to a different camshaft variation due to
> > emissions? I have spent 3 days on this so if any can lend a hand I
> > would appreciate it. I think they are different, am I overlooking
> > something???
> >
> > One other weird thing, I ordered the spline o-rings from several
> > Ferrari parts places and all sent me ones that were so wrong they  
> > were
> > up to an 1/8" off. I ended up using my old ones but they are worn.
> > Does anyone know the correct size of that o-ring? I would try to
> > source it but I have only really worn or wrong ones. What is funny I
> > bought a set of metric o-rings with 50 sizes a while back and none of
> > them are the right size!! Go figure
> >
> > The last pic is of my original advance weights with notations that
> > Mike F. here on the list added. What is weird is the car ran so  
> > great,
> > always started never stumbled revved to redline and just screamed all
> > this with 25 degrees of dwell and these weights?????????
> >
> > Sincerely,
> >
> > Rob Garven
> >
> > pics are here
> >
> > http://www.ferrarichat.com/forum/showthread.php?p=137531139#post137531139
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