Keeper ring on top of fuel injector

what i mean is more like is it possible to take the fuel injector rail out and simulate a test to see if one or more of the injectors are leaking by hooking it onto a separate source of pressurized liquid ?

sort of like when i took the cylinder heads out, i used various testing techniques to make sure the newly lapped valves didn't leak, such as filling the intake and exhaust runners with water to make sure it doesn't get wet on the other side and similar tests.

 

If they are clogged, it will be visible.

I wouldn't attempt that test, nor have I ever done it. That's not to say you can't, but you probably should not for a multitude of reasons. There are better ways of diagnosing lack of fuel pressure, fuel injector mechanical pintle fuel discharge, and leakage (usually notable by getting a drop in fuel pressure PSI after fuel pressure prime, and/ or flooding of the engine if the leak is bad enough).

 

i actually have the FSM, which i downloaded after buying a 2 day subscription. and you are wrong. it is not very big on tests. i've picked up on most tests that i performed either from YouTube, or the minority of useful online forum users, IOW word of mouth. the FSM I use almost exclusively for pictures and torque spec.

 

I have not looked an FSM in as long as I cannot even remember. It's all nuts and bolts to me working in synchronous harmony to create a running rotating masterpiece.

Unless it is for some reason some overly complex starter inside the intake manifold setup like on some Lexus', It's pretty simple to figure out. For me at least. Lol.

 

Never pulled the cover off my engine but do the factory rails have a test port?

 

No they utilize a lock clip to banjo bolt style attachment which requires a special adapter to make it mate on to the rail.

Pretty unnecessary in this day in age, especially when you have GM and Ford utilizing simple screw in to schrader type test ports on their lines, which is close to a standard now. Toyota always complicates things but I digress.

 

I found one pic online showing after I posted. I didn't know the regulator was rail mounted either.

That's how my other truck is test port on side of rail. No regulator except in tank and non return. Headache.

 

that's why i ask questions probing fundamentals of design but then get called out that i see myself as superior to Toyota engineers...

 

I hate those setups. They refer to those as returnless fuel system setups.

I personally prefer return setups over their counterparts, which is why I'm glad they retained this setup on this truck. What I do like about their counterparts though is the entire elimination of the return line. It simplifies mechanical teardown when it is time to do so.

They do things differently than other manufacturers, however, that does not make their methods or parts utilization wrong. Remember, there is more then one way to skin a cat.

 

I work for a leading supplier of automotive fuel injectors worldwide ( Bosch ) maybe I can assist.

That is called a Support Disk on the injectors we build it is molded plastic, but it appears yours are not molded but set into a groove on the extension tube. Its main purpose in life is to provide rigidity to the o-ring and assist in sealing the injector to he fuel rail.

A gasoline leak can be disaster. If it were me I would replace the injector.

 

Disaster is right

Gsm fuel rails come to mind.

 

Look in the spot in the rail where that injector came out of. Support disk (o ring) could be still stuck in there.

 

Bosch makes some trick shit. I really like their quality and attention to detail on the parts they provide. One of the few OE suppliers I like besides Denso.

 

You can probably find what you need here
http://www.mrinjectorparts.com/store/c1/Featured_Products.html

Also if you look at the kits you will see how the screens work for (clogged) repairs if needed. As


Testing and Inspection is as listed.

1GR-FE FUEL: FUEL INJECTOR: INSPECTION

1. INSPECT FUEL INJECTOR ASSEMBLY

(a) Check the resistance.







(1) Using an ohmmeter, measure the resistance between the terminals.
Standard:




If the result is not as specified, replace the fuel injector.



(b) Check the injection volume.





NOTICE:


* Perform the test in a well-ventilated area and watch out for flames.
* Handle the fuel tube connector carefully.
(1) Install the SST (fuel tube connector) into SST (hose), then connect the tube connector to the fuel pipe.





SST : 09268-31012

95336-08070

09268-41091

SST : 09268-41140

SST : 09268-41400

09268-41500

SST : 09842-30080



(2) Remove the pressure regulator See: Fuel Pressure Regulator\Service and Repair\Removal.
(3) Install the O-ring onto the fuel inlet of the pressure regulator.
(4) Connect SST (hose) to the fuel inlet of the pressure regulator with another SST (union) and the 2 bolts.





SST : 09268-31012

95336-08070

09268-41091

Torque : 9.0 Nm (92 kgf-cm, 80 in-lbf)



(5) Connect the fuel return hose to the fuel outlet of the pressure regulator.
(6) Install a new O-ring onto the injector.







(7) Connect SST (adaptor and hose) to the injector and hold the injector and union with SST (clamp).
SST : 09268-31012

95336-08070

SST : 09268-41140

SST : 09268-41400

(8) Set the injector in a graduated cylinder.
CAUTION:
Install a suitable vinyl tube onto the injector to prevent gasoline splashes.

(9) Connect the Techstream to the DLC3.
(10) Turn the ignition switch to ON.
(11) Turn the Techstream ON.
(12) Enter the following menu:
Select: Data List / Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

(13) Install SST onto the fuel injector.
SST : 09842-30080

(14) Connect SST to the battery, then measure the injection volume for 15 seconds. Perform the inspection 2 or 3 times, then calculate the average.





Standard::




NOTICE:
Always do the switching at the battery side.

If the result is not as specified, replace the fuel injector.



(c) Check the fuel leakage.
(1) When checking the injection volume, remove SST from the battery. Inspect the fuel leakage from the fuel injector.
Standard:

1 drop or less every 12 minutes.

If the result is not as specified, replace the fuel injector.



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I also hope he is planning on replacing the o-rings as they also tend to stiffen and get set in their shape after a period of time. They should be considered a one time use item...

Not saying they will leak if reused, but it is cheap insurance.

But I really do not know what I am talking about. As a novice with only 20 years in the injector business.

 

Bunch of YouTube videos also showing it.

 

I'd say that's cheap insurance with anytime they are removed also x2

 

was gonna say that. Toyota manuals from techinfo.toyota.com are the best manuals for anything ever built.
test procedures for everything electric, mechanical, and electromechanical are all over the place

 

The observation about a groove is correct.

So let me paraphrase your statement in my own words to make sure my understanding is right. You tell me if it's right or wrong:

The support disk is utilized to reinforce ("provide rigidity to") the O-ring while the latter is alone directly responsible in forming a seal between the injector and the rail. However, an absence of disk can loosen the direct provider of seal (O-ring) and thereby compromise its effect just like taking a lifesaver from a drowning victim could make him drown but doesn't necessarily have to nor would be the direct reason he drowned (his inability to swim is). While theoretically the O ring alone without the support from the disk could continue to do its job successfully, the odds are against its favor, IOW you want to have it on just like you want to wear a life jacket when you go rafting.