Re: Replacing fuel injectors
From: Michael James (cavallino_rapanteyahoo.com)
Date: Wed, 14 Jan 2009 14:01:13 -0800 (PST)
You're referring to the 'earlier' style of Injectors that were more of the 
push/pull variety that sealed with an O-ring around the base of the injector.  
You have the later style that have a larger bushing 'under' the steel carrier - 
it looks like a black mushroom with a hole through it.  There are some 
excellent pics of the two different setups, including the unique seals for 
each, on FChat if you'd like to search around there before tearing things apart.
 
M

--- On Wed, 1/14/09, Rick Lindsay <rolindsay [at] yahoo.com> wrote:

From: Rick Lindsay <rolindsay [at] yahoo.com>
Subject: Re: [Ferrari] Replacing fuel injectors
To: "Michael" <Cavallino_Rapante [at] yahoo.com>
Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
Date: Wednesday, January 14, 2009, 12:28 PM

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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