Ferrari Mailing List: Re: Replacing fuel injectors

[Rick Lindsay (rolindsay]

Can the injectors be changed without removing the steel retainers?


--- On Wed, 1/14/09, LarryT <l02turner [at] comcast.net> wrote:

> From: LarryT <l02turner [at] comcast.net>
> Subject: Re: [Ferrari] Replacing fuel injectors
> To: "rolindsay" <rolindsay [at] yahoo.com>
> Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
> Date: Wednesday, January 14, 2009, 4:15 PM
> Geez, that sounds like a real PITA!  I wonder, what, if
> anything, could be 
> done to prevent a repeat at the next Injector replacement? 
> Would NeverSeize 
> hold up to all that heat over the years?
> 
> Is 25 years a little long to go between replacements?   Of
> course, if it's 
> *that* hard to remove the old ones perhaps that why it was
> so long between 
> changes?  ;-]
> 
> Thx -
> Sincerely,
> Larry T  (74 911, 91 300D 2.5T)
> www.youroil.net Oil Analysis Kits &
> Porsche Posters/Weber parts
> Test Results - http://members.rennlist.com/oil/
> 
> http://www.scamfreetop10.com/1233.html
> 
> 
> .
> ----- Original Message ----- 
> From: "Michael James"
> <cavallino_rapante [at] yahoo.com>
> To: "Larry Turner" <l02turner [at] comcast.net>
> Cc: "The FerrariList"
> <ferrari [at] ferrarilist.com>
> Sent: Wednesday, January 14, 2009 4:56 PM
> Subject: Re: [Ferrari] Replacing fuel injectors
> 
> 
> 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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