Re: Replacing fuel injectors
From: Michael James (cavallino_rapanteyahoo.com)
Date: Wed, 14 Jan 2009 13:56:44 -0800 (PST)
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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