asudan96Runner

I installed the 305cc Supra injectors, while Steve cheered me on. Everything looked good, and she started up just fine.

I decided to go out for a beer with some friends and noticed a VERY strong gas smell. Things got worse and worse and the check engine light came on. Next the engine died at a stop light. I finally got it running again and she runs rough.

When I got home I got out my light and found gas puddling up around the fuel rail and injectors.

What gives? I think they are all tight and seated well. I really dont want to pull the S/C at 1am, but it looks like my only damn option....

Anyone?

Dan

PhxTRDRunner

Hey Dan, if you are up give me a call. Sounds obviously like one or more of the injectors didn't seat correctly. Make sure you used all 6 o-rings on the injectors. I've almost missed one a few times. I haven't pulled a injector rail from a 3.4, but if there are spacers, make sure you reused all of them, the injectors won't seat right if you don't. I'll be up another half hour or so. 1:42am right now.


~Ralph
602-421-2202

asudan96Runner

Ralph,

You were right. One of the injectors had a pinched o-ring which broke. It was pretty obvious when I started pulling everything apart. No worries, I put on a new o-ring and she is running "leak free" again.

Give me a buzz around 11:30-12:00 tomorrow and we can meet up at the dyno. It looks like we are a go..... barring any problems in the next 8 hours....

Dan
3am

sschaefer3

You are Crazy !!!

asudan96Runner

Just trying to keep up with you man.

Dan

Duffdog

um--- did you use gasoline to lube the injectors for the install??????????? ( you should always use corn oil ) that way the o rings wont deform and rip.

Tim

asudan96Runner

I used motor oil.

Dan

Gadget

Never use motor oil on fuel system or brake O rings. You should use a special O ring lube for that specific application or use the liquid that they are designed to seal against. In this case they should have been lubed with gasoline.

Any other stuff can have a bad result. For example, brake system O rings will swell up like a donut if they come in contact with motor oil.

I would not take them back apart for that reason, but in the future use gasoline when to install them.

Also, before you clamp the fuel rail all the way down, give the injectors a twist. They should rotate freely without binding. If they don't you have a goofed O ring that you need to deal with.

Are you haveing fun yet???

Gadget

www.GadgetOnline.com

asudan96Runner

the did move freely, and all is well.


Yeah, having fun alright.

Dan

Duffdog

gadget---

This is where you and i have disagreements all the time i guess--im wondering who said to use gasoline on fuel injector o-rings. Thats something that just doesnt jive well with me. For one thing, if you use gasoline--how many seconds till it evaporates off of the o-rings and you are left with no lubrication? I suggested using corn oil because that is what you should use. not motor oil nor any other bs, you want a lubricant that is does not evaporate, does not clog the injectors and burns away clean. the damaged o-rings are a result of the gas evaporating before someone can get the injector into the rail and the rubber getting smashed. If you use corn oil ( or any other natural non-petroleum lubricant ) you will avoid the problem that so many other people on this forum have with screwed up leaking injectors. Do me a favor, next time you install injectors, use some corn oil and observe how easy they pop right in and how many leaks you do not have.

Tim

ps-- hows your super motor coming along?

MTL_4runner

I think anything combustable, soluble in gasoline and works well as a lubricant should work. I agree that rubber o-rings when in prolonged contact with motor oil, will expand substantially, but that it is such a minimal amount that I would doubt any ill side effects from doing it. Most of the oil will be squeegeed away during the install. Corn oil would be a good suggestion in my opinion since it does follow the above criteria and as far as I know, has no long term effects on rubber (heck, they even have diesel engines that run on purified corn oil). If you are using silicone o-rings there is not much you can do to damage them in terms of lubricants.....they just tear really easily......

Just my 2 cents

Gadget

I guess we where just schooled differently. My background is in aerospace and everything is done by strict proceedure there.

Do you have some doccumentation that says that corn oil is the proper lube to use on fuel system O rings?

I do not know everything and that is why I did not dispute what you wrote, as you maybe correct, but I am certainly not wrong. My background says unless a specific assembly lube is indicated you should use the substance that fluid handling system transports. You will never go wrong with that.

Gadget

www.GadgetOnline.com

MTL_4runner

I thought you might be an engineer :tomcat:

I don't think anyone can argue with your logic but some may find it difficult you work with gasoline as a lubricant. Might be nice to find some alternatives that won't damage the o-rings.

Gadget

I am not an engineer. I was the guy all the engineers hated because I could fix their design errors with no effort at all.

Gadget

www.GadgetOnline.com

MTL_4runner

OOOOOOOF......below the belt shot!......roughing the passer on that one.

What did you do? Tech? Inspection? QC?

Gadget

FYI, the Factory Service Manual says to use gasoline to lubricate the fuel system O rings for assembly. I did find one reference that indicates that spindle oil can be used, what ever that is.

Gadget

www.GadgetOnline.com

MTL_4runner

OK....there you have it folks....use anything else and you are on your own.
Thanks for looking that up for us!

ravencr

I agree with Gadget and Duffdog. I think it makes total sense that gas should be used to lubricate them, but in the same respect it does evaporate too quickly, which does leave them dry and easily tearable when placed back in the fuel rail. So, per Duffdog's recommendation and after having to remove the S/C after having leaky injectors using gas as the lubricant, I used corn oil and it worked perfectly.

Now, all this tells me is that if you are unlike me and are a very fast mechanic, then use gas, and if you are slow like me, use corn oil, because it stay lubricate longer.

Chris

Duffdog

The shop foreman at the Toyota dealer told me to use corn oil, he says that most mechanics follow the manual and it has to be redone anyways because of leaks.

tim