Refitting injectors

Refitting injectors

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Discussion

ianwayne

Original Poster:

6,244 posts

267 months

Sunday 7th February 2016
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Had injectors cleaned by injectortune but having trouble getting them back in. I used engine oil on the new seal but it seems a very tight fit. Can't get them other than a short way in. There is copper coloured ring about 240 degrees around in the injector aperture as seen below:



Obviously I don't want to hit it (the injector that is!) and I've tried a long socket over the injector end and pushed hard but it will only go a very short way in. All the apertures are like this. Do they just sit in there almost loose until fuel pressure comes up? Is there a technique I'm unaware of?


Edited by ianwayne on Sunday 7th February 22:42

Colin RedGriff

2,526 posts

256 months

Sunday 7th February 2016
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That looks like some sort of dirt. As I remember the injectors are a simple push fit in. The do need lubricating, are you sure the orings are the right size?

ianwayne

Original Poster:

6,244 posts

267 months

Sunday 7th February 2016
quotequote all
All 8 are like that, it's not dirt. Injectortune changed all the O-rings but sent all the old ones back as well, they look the same.

Found a thread on the Griffith forum where a fella put them in the fuel rail first, using the tightening down of the fuel rail with its 4 nuts to ensure they are pushed home. Seems a good plan:

http://www.pistonheads.com/gassing/topic.asp?t=139...

woodlandsale

22 posts

119 months

Sunday 7th February 2016
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Sorry to butt in in the middle of this thread, but I'm about to do the same job of having my injectors cleaned, and I'm falling at the first hurdle because I can't even get the plenum chamber off- it fouls the mesh grille that overhangs the engine bay in front of the wipers. (i.e I can't lift it high enough to clear the rearmost intake trumpets).I've read that this stage is supposed to be easy, so what am I missing? I don't want to force or strain anything as this is the first task I've attempted on the Chim. Any advice gratefully received.

ianwayne

Original Poster:

6,244 posts

267 months

Sunday 7th February 2016
quotequote all
To get mine off, I disconnected the throttle cable at the lever end & the stepper motor connection so that I could swivel the plenum through 90 degrees. It was then possible to tilt it enough to clear the rearmost trumpet without too much trouble.

I also found this after much searching. OK, it's for a post 1999 Range Rover but it suggests fitting the injectors to the rail first:

http://workshop-manuals.com/landrover/p38/19_fuel_...

Edited by ianwayne on Sunday 7th February 18:07

ukdj

1,004 posts

183 months

Sunday 7th February 2016
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you can "flex" the grille upwards (helpful to have another pair of hands to help) and then with some careful movement of the the plenum cover slide it up over the rear trumpets and then remove it.

refit the injectors to the rail first (use vaseline as a lube/sealing agent on the o-rings at both ends)

push injectors down into inlet manifold and once located tighten down bolts in fuel rail mountings a bit at a time so the rail goes down true (you can use a rubber mallet with a reasonable amount of force to send them home if needed)

Make sure that the inlet manifold holes are thouroughly clean as any dirt grit can easily cut the new o-rings leading to an instant leak and therefore having to start the process again.

woodlandsale

22 posts

119 months

Thursday 11th February 2016
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Excellent, thanks. I'll try that and report on the result. Meanwhile I've ordered a new temperature sensor as advised in the bible as a potential cure for shunting (which is one reason for having the injectors done). Might try the sensor before doing the injectors, after reading various threads about this. Maybe it will provide a very cheap (£13) cure.

ianwayne

Original Poster:

6,244 posts

267 months

Thursday 11th February 2016
quotequote all
Fitting the injectors to the rail first made it fairly simple.

They only really 'sit' in the inlet manifold with the nuts securing the fuel rail sufficient for me to have no leaks. Immediate improvement in idling from cold. Doesn't seem to be running on only 6 or 7 for the first couple of minutes now. smile

Getting the plenum back on WAS fiddly, especially trying not to make a mess of the RTV sealant bead I'd just put on.

Edited by ianwayne on Thursday 11th February 22:59