Ferrari Mailing List: Re: Replacing fuel injectors

[Rick Lindsay (rolindsay]

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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