Ferrari Mailing List: Re: Replacing fuel injectors

[Michael James (cavallino_rapante]

I'm afraid not, as you'll want to replace the rubber seal under the steel 
carrier as well - otherwise, you could have leakage around the re-inserted 
injector using the old seals....and that's no good!  Plus, pushing 'down' with 
the old seal still in the carrier might push the seal down into the 
intake.....and then you're REALLY SCREWED.
 
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, 7:33 PM

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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