How to fit new injectors
09-15-2007, 08:10 PM
#1
Drifting
Thread Starter
How to fit new injectors
I'm considering replacing some/all of the fuel injectors with brand new ones.
Once you've pulled the two fuel rails, how big a job is it to take off the old ones and replace with new?
I've done a lot of searching here and see references to things like cutting hoses where they meet the fuel rail, dropping the plastic hats into cylinders, losing clips and other hazards. Do these all apply when fitting new ones? Any tips for the procedure?
Many thanks
Once you've pulled the two fuel rails, how big a job is it to take off the old ones and replace with new?
I've done a lot of searching here and see references to things like cutting hoses where they meet the fuel rail, dropping the plastic hats into cylinders, losing clips and other hazards. Do these all apply when fitting new ones? Any tips for the procedure?
Many thanks
09-15-2007, 10:11 PM
#2
On the Bandwagon
Rennlist Member
Rennlist Member
Injector are real easy.
Un bolt the fuel rails and disconnect the fuel lines. If they are un-molested, the wire retaining clips will be swaged at one point into the groove arround the Amp connector - I ran a sharp point over the swaging a couple of times to remove it. I then used the end of a wrench to lever the fuel rails straight up, with injectors still attached. It can be in there tight, but just keep working on it.
For installation, make sure that the pintle cap is on the tip securely, and that the o-rings match up to the old one. I coated the o-rings with a little vaseline and the injectors went in no problem.
MAke sure the area is cleaned up as much as possible from dust & debris before you start.
Good Luck!
P.S. Say "hi" to Bill for me
Un bolt the fuel rails and disconnect the fuel lines. If they are un-molested, the wire retaining clips will be swaged at one point into the groove arround the Amp connector - I ran a sharp point over the swaging a couple of times to remove it. I then used the end of a wrench to lever the fuel rails straight up, with injectors still attached. It can be in there tight, but just keep working on it.
For installation, make sure that the pintle cap is on the tip securely, and that the o-rings match up to the old one. I coated the o-rings with a little vaseline and the injectors went in no problem.
MAke sure the area is cleaned up as much as possible from dust & debris before you start.
Good Luck!
P.S. Say "hi" to Bill for me
09-16-2007, 03:33 AM
#3
Drifting
Thread Starter
Thanks Ken - didn't realise it was this easy! So am I correct thinking the old injectors just pull off the fuel rail? Can you pop new ones on in their place or are there any hoses between injectors and rail which have to be replaced? I see references to new hose kits but not sure if I neeed them as well as new injectors. Presumably if I buy the Porsche/Bosch injectors then the o-rings match?
If anyone can post a photo of the connection between injector and fuel rail that would be great.
Adrian
If anyone can post a photo of the connection between injector and fuel rail that would be great.
Adrian
09-16-2007, 03:57 AM
#4
Drifting
Whilst Ken says it is easy, it is also very easy to mess up, with catastrophic results. There's a Guy called Ronald on the UK list who had an engine fire write off about two weeks ago after replacing injectors.
Also beware the fuel rail spacers! These are thick washers that fit between the fuel rail and the plenum. These may only be present on certain years, they are definitely fitted to mine, and they directly control the distance between the rail and the head, and thus the fit of the injectors.
When you finish make sure you jump the fuel pump relay to pressurise the system and look for leaks before you start the engine.
Also beware the fuel rail spacers! These are thick washers that fit between the fuel rail and the plenum. These may only be present on certain years, they are definitely fitted to mine, and they directly control the distance between the rail and the head, and thus the fit of the injectors.
When you finish make sure you jump the fuel pump relay to pressurise the system and look for leaks before you start the engine.
