runethechamp

Posted this question in my rebuild thread, but with no responses I'll make a separate thread for this.

Why is it that the FSM specifies and emphasizes to NOT use engine oil on the o-rings during injector installation. I see witchhunter says you can use that, but I haven't been able to figure out why the FSM has that statement in there. Any injector specialists out there who knows the answer to this?

mr toytech

engine oil will swell the injector o rings. i think they say to use petrolium jelly on them.

mr toytech

i will correct myself, it says to apply gas to them before installation. not petrolium jelly. but as i said before engine oil will swell the orings causing them to leak or tear after installation.

weakyota91

i used motor oil seems to be fine i dont think its that big a deal. Or just use gas to be on the safe side

gametom

petrolium jelly is the way to go
i tryed twice with gas and had leaks

shaeff

i just did mine after i got my injectors cleaned. used petroleum jelly. did the same on the supra, no issues with either thus far.

Blurr

i didn't use anything. so far 4k+ miles and no leaks.

runethechamp

I read something somewhere where they suggested that the note in the FSM is a product of a bad translation. Even witchhunter suggests engine oil on their website, so I guess it can't be that bad. I hope it's not since I discovered the note in the FSM after I had installed the injectors using engine oil