Ferrari Mailing List: Re: Replacing fuel injectors

[Michael James (cavallino_rapante]

Tough to say - there are 'some' moving parts within the Bosch injector to 
atomize the fuel (I think that's why they 'buzz' when pressurized fuel is 
delivered from the top).  Since these machines don't see HUGE miles, but do see 
stagnant fuel from sitting, you could conceivably consider the FIs to be a 
'wear item' and just replace them when running cans of Fuel Injector cleaner 
doesn't clean/clear them adequately anymore.  
 
There are Bosch FI test-bench setups (a good friend has one) that supplies a 
fluid at the correct pressure and allows the tester to verify the spray 
pattern.  Eh.....I just found a new set of brass injectors on Ebay for cheap 
and bought the mushroom seals from Dennis McCann.  
 
M

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

From: LarryT <l02turner [at] comcast.net>
Subject: Re: [Ferrari] Replacing fuel injectors
To: cavallino_rapante [at] yahoo.com
Cc: "The FerrariList" <ferrari [at] ferrarilist.com>
Date: Wednesday, January 14, 2009, 5:15 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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