Ferrari Mailing List: Re: Changing fuel injectors

[Rui Gigante (rui.gigante]

On 1/1/07, Jeff Greenfield <coyote [at] acme-ltd.com> wrote:

> Rui -
>
> I wouldn't be concerned about the lack of fuel at this point. No FI system
> will hold pressure for a week. Usually the spec is that they are supposed
> to
> hold pressure for a certain amount of time, but it is measured in hours
> not
> days or weeks.


Thanks. I has occured to me that it might be the fuel injectors leaking, so
I will test again after changing them




> The oil/carbon on the old injectors is normal. Don't worry about it.


That is good news. I was worried ...





> I can't tell from your photos whether the seal you are talking about came
> out with the injector, or stayed in the manifold. The only seal that I am
> aware of that you need to be concerned about is the oring on the base of
> the
> injector. If the oring remained in the manifold, you should be able to
> remove it with a small screwdriver or dental pick.


The o-ring came with the injector. I'm talking about the seal that stays in
the manifold. Anyway I've bought 8 new seals from Mercedes, p/n MA116 078 08
73, at .9 euros each! It is a tight fit for a new injector o-ring, but I
guess that's the way it should be.
Removing the old ones has been difficult. I don't want to harm the aluminium
... I'm taking it slow and easy



When you re-install, use some spray SILICONE (not WD-40, or a penetrating
> oil, anything other than pure silicone ie petroleum based products will
> attack the rubber) on the oring and the injectors will slide right in.
> (put
> the oring on the injector and install the two together.)


Will do that, thanks.



> The spacers are on the (or around) the studs that hold the plenum to the
> manifolds. I don't think that it is possible to remove the manifolds with
> the plenum attached. Personally I would try to avoid removing the
> manifolds
> from the heads unless there is a really good reason to remove them.
> Getting
> the old gaskets off the heads can be really nasty. As in many, many hours
> if
> not days of soaking them with gasket remover, and picking away at them
> with
> a gasket scraper while trying not to gouge the soft aluminum. I recently
> went through this on a BMW, and it was not fun :-(


It seems difficult to get to the thermo time switch and hoses under the
plenum without removing it, but given the risks, I guess I prefer a few
bruised knuckles and extra time ....


Rui
88' 328 GTS - under surgery