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Installing Injectors - Do's and Dont's

Turbo Tits

By Turbo Tits,
in Engines & Forced Induction

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Turbo Tits Community Regular

Turbo Tits

Posted
Posted

Hey people, I'm installing larger injectors on an rb25 and I need some help.

What's the procedure after you have removed the top half of the plenum? Does anyone have any tips? What worked for you? What didn't? What lubrication should you use on the o-rings to help locate the new injectors? Oh, and i remember reading about having to pressurise the fuel rail afterwards- can anyone shed some light on this?

Basically, anything you can think of that would help would be much appreciated.

:P

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Bullant47 Community Regular

Bullant47

Posted
Posted
Hey people, I'm installing larger injectors on an rb25 and thought it would be nice if everyone who has replaced their injectors (on any RB) could post their experiences to make it a smoother exercise for others doing it for the first time.

What's the procedure after you have removed the top half of the plenum? Does anyone have any tips? What worked for you? What didn't? What lubrication for the o-rings? How do you pressurise the fuel rail after installation?

Basically, anything helpful that you can think of.

:P

Make sure you have all new "o" rings, there are 2 on each injector, and are usually not supplied with new injectors (Nismo). Nissan can get them. Their are a few other little bits you can do at the same time. I'm thinking of a little rubber bit that sits on the top of the injector.

Hope that helps.

ken

Bullant47 Community Regular

Bullant47

Posted
Posted
thanks for that bullant. what lube should you use on the new o-rings?  

surely there has to be more to it than that, anyone???

Yes there is a special grease to use on the "O" rings. Repco sell the stuff..I think it is PBR rubber grease.

I watched my mechanic do the whole job twice cause the first time he didn't realise there was a "O" ring missing off the body of the Nismo injectors. When he pulled the injectors out he didn't compare the stock with the Nismo's.

The hardest part of the job was taking out and replacing some bolts under the inlet manifold.

Hope that helps

Ken.

Bullant47 Community Regular

Bullant47

Posted
Posted
What about the throttle body and the plenum gaskets? Do they have to be replaced?

No..you will only see the Plenum gasket which is a substantial gasket. If your carful when you seperate the top of the plenum from the bottom you should be fine without replacing anything.

Ken

BigDatto Proficient

BigDatto

Posted
Posted

DO:

be prepared for the job to take longer than you think...

have a can of silicon spray handy (OK to use with fuel system components)

have band aids/first aid kit handy (you WILL cut your hands on the plenum casting dags)

have a slim 10mm ring spanner with slight offset. This will clear the rocker cover for the "ultimate bitch" bolt. You'll know which one I mean.

have carby cleaner aplenty

have some Loctite or similar

be aware that there are (6 from memory) black washer type spacers between the rail & head. If you drop one, you might never see it again.

have a long extension for your socket. 18" is good.

raise the car on stands before you commence.

strong lighting is essential.

and rags aplenty.

Replace all fuel hose w/ proper efi hose & clamps - don't be dodgy & reuse the brittle oldies or regular hose clamps

Replace the filter too

good idea to saturate & scrub all the carbon & oil from the top half with carby cleaner

you'll need to remove a bunch of vac hoses from under the plenum to get your socket on the bolts - pain in the arse.

DON'T:

use excessive force to remove the injectors - they will be very tight. Lots of silicon spray & gentle tapping helps.

let swarf/dust/dirt into anything.

over torque the plenum bolts (everything is alloy)

This is a royal biatch of a job- but very rewarding. If i had to do it again I could in less than half the time, hope you gain from my experience.

  • 5 months later...
Jolinator Proficient

Jolinator

Posted
Posted

big datto is correct, had mine off to when i polished the manifold, and also had the injectors cleaned whilst at it

also to add to the do list, you may aswell replace the plenum gasket etc, mine was stuffed as it was glued down with some goop shit however when i took the top half off an rb25 it didnt have it so maybe its an rb20 thing, gaskets arnt expensive anyway,

  • 2 weeks later...
SLY33 Mentor

SLY33

Posted
Posted

I found removing the TB made it a million times easier to access the bolts on the underside of the top half of the plenum. But im sure youll find a Mr.Fantasic on the forum that'll say you wont have the remove the TB. But really, its only another 5 minutes work.

USRB25S13 Enthusiast

USRB25S13

Posted
Posted

I did my injector swap a few months ago and I didn't remove the upper plenium. I just took off the throttle body and all lines under the plenium to get the rail out. It was a pretty easy job. I have an inpact screw driver to take the injectors screws out. That makes a big difference.

BHDave Grand Master

BHDave

Posted
Posted

I've done it a couple of times on an rb25 aswell, didn't need to remove the top half of the plenum, just the throttle body and coolant bleed at the front.

On rb20 i didn't even need to remove the throttle body.

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