Ferrari Mailing List: Re: Replacing fuel injectors

[Jeff Greenfield (coyote]

I haven't been following this discussion all that closely so I maybe  
completely wrong.

I replaced the injectors on my QV (1985 US spec) sometime ago.  
Although my memory is fuzzy and I haven't looked at the car in several  
months (since the car is hibernating for the duration of our wonderful  
new england winter) I don't remember it being any big deal.

My recollection is this:

Remove the hard fuel lines from the injectors (use a wrench to hold  
the injector from turning).

Remove the nuts that hold the small circular retainers and remove the  
retainers.

Pull the injectors straight up. Don't remember exactly how I did it,  
might have used a pry bar, screwdriver, or forked tool of some sort to  
'lever' them out.

Put the new o-ring (don't reuse the old ones, they will be hard and  
brittle) on the new injector, put a little lube of some sort on the o- 
ring and push it home.

Reassemble everything else.

I gather there might be an earlier version that might be different,  
and if so this may not apply to this application.

YMMV,

Jeff

Sent from my iPhone

On Jan 14, 2009, at 5:12 PM, Rick Lindsay <rolindsay [at] yahoo.com> wrote:

> Well poop!  When you pull the injector, does the o-ring stay in the  
> runner, under the retainer?
>
>
> --- On Wed, 1/14/09, Michael James <cavallino_rapante [at] yahoo.com>  
> wrote:
>
> > From: Michael James <cavallino_rapante [at] yahoo.com>
> > Subject: Re: [Ferrari] Replacing fuel injectors
> > To: "Rick Lindsay" <rolindsay [at] yahoo.com>
> > Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
> > Date: Wednesday, January 14, 2009, 3:56 PM
> > I have this chore sometime this winter, but can relay the
> > experiences of some local 308 friends who have - you'll
> > need a long, 3' Breaker Bar and a few days of PB Blaster
> > soak before those things will budge.  Two and a Half
> > decades of heat cycling and dissimilar metal bonding make
> > these an absolute chore.  A high-torque impact wrench was
> > also used.....by pulling the injector straight UP out of the
> > hole, and re-inserting an Allen impact Socket of exact
> > dimensions for the hole in the injector race.
> >
> > I have a spare set of intakes with identical Injector
> > assemblies - a VERY strong friend (who could pull the
> > older-style injectors out with his bare hands) and I
> > attempted to turn the injectors free using a bench vice and
> > a standard metric wrench.  The amount of torque we applied
> > should have broken something free - we didn't.
> >
> > M
> >
> > --- On Wed, 1/14/09, Rick Lindsay
> > <rolindsay [at] yahoo.com> wrote:
> >
> > From: Rick Lindsay <rolindsay [at] yahoo.com>
> > Subject: [Ferrari] Replacing fuel injectors
> > To: "Michael" <Cavallino_Rapante [at] yahoo.com>
> > Cc: "The FerrariList"
> > <ferrari [at] ferrarilist.com>
> > Date: Wednesday, January 14, 2009, 9:48 AM
> >
> > Hello Friends,
> >
> > I have a question or two regarding the process of replacing
> > K-Jetronic
> > injectors.
> >
> > My car uses an early K-Jetronic system, without lambda and
> > without the vacuum
> > limiting device fitted to U.S. Spec. cars.  It also uses
> > the earlier style of
> > injector retainers which are screwed into the inlet
> > runners.  Here's a look
> > at one, http://www.aubard.us/Mondial/HPIM1336.JPG .  And as
> > anyone who has
> > removed spark plugs from an aluminum head knows, there is a
> > chance for galling
> > the aluminum as I (attempt to) unscrew the 25 year old
> > steel retainers!  Since
> > these seem to be original steel injectors, they are most
> > likely original
> > equipment and have been in place for 25 years!
> >
> > The recommended removal method is to disconnect the
> > plumbing then unscrew the
> > retainer with a deep socket on the injector.  I anticipate
> > a good cleaning
> > followed by a soak of PT Blaster as a thread lubricant
> > before attempting to
> > unscrew the retainers.  Any of you done this?  Can you
> > recommend a better
> > methodology?  Perhaps a light rap of a hammer on the steel
> > bit by placing a
> > larger socket over the injector; something to just loosen
> > any corrosion between
> > the threads and the runner?
> >
> > The next issue becomes the installation of new injectors.
> > As you probably
> > know, the new injectors are made of brass, a softer metal.
> > Newer cars used hard
> > rubber plugs rather than steel retainers.  My concern is
> > about later removal of
> > the injectors with only the soft brass injector flats to
> > unscrew the steel
> > retainer.   So again, I ask for your experience. Should I
> > just lube the steel
> > threads with a copper-based anti-seize, not over tighten
> > and not worry?  Or
> > can/should I update the retainers to the rubber plugs?
> > Will they work in
> > threaded holes?  Or perhaps should I mill a slot in the
> > steel retainer tops and
> > later fabricate a special tool to help unscrew them?
> >
> > Your experienced advice is appreciated.
> >
> > regards,
> >
> > rick
> > '83 Mondial QV
> > '79 308GTB
> > other stuff
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