Ferrari Mailing List: Re: Replacing fuel injectors

[Rick Lindsay (rolindsay]

Thanks Ric,

I don't see how the injector's o-ring can come out of the hex-hole in the 
carrier.  The ring is larger than the injector flats.  What am I missing here?

rick


--- On Wed, 1/14/09, Ric Rainbolt <ricrainbolt [at] gmail.com> wrote:

> From: Ric Rainbolt <ricrainbolt [at] gmail.com>
> Subject: Re: [Ferrari] Replacing fuel injectors
> To: "rolindsay" <rolindsay [at] yahoo.com>
> Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
> Date: Wednesday, January 14, 2009, 10:27 AM
> The injector is actually resting in a rubber cushion, inside
> the 
> steel carrier, if memory serves. You can use a pair of open
> (or other 
> suitable prying instruments) end wrenches to pry the
> injector out 
> before unscrewing the carrier from the head, or you can use
> the 
> injector to unscrew the carrier (be careful to keep the
> injector fully seated).
> 
> Ric Rainbolt
> 
> At 08:48 AM 1/14/2009, you wrote:
> >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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