After finding a boost leak at the primary rail I ordered new seals/insulators from Ray. I have search the forum but can't find a clear answer on the following topic.

There are air relief holes in tip of the primary injector rail that will not be sealed by the insulator installed at the tip. There are also holes in the block in the rail recess, I assume to receive the air vented from the rails back to the chamber.

1. Where do the holes in the block go?

2. If there is only the insulator at the tip of the rail, what prevents air and gas from leaking up the sides and out the top? It seems there is only metal to metal contact. I'm thinking of putting an o-ring in as shown in the photos, but if it is not necessary, then I wont.

I'm missing something ?

 

I wish all the questions were as easy as this. First of all, you should have gotten two seals from Ray. They go in the intermediate housing in the farthest most lip toward the top of the ports. Before your holes in the housing. They seal along the tapered end of injector's housing. the small little holes go from port to port to equalize pressure. you don't need any o-rings or anything, just the seals that fit into the housing.

 

The o-rings you have on the rail in that picture are incorrect, I'm not sure where you got those. The correct o-ring is kind of flat, like most rubber bands are. It sits right where the lowest o-ring is in your first pic. Get 2 of those and that should solve your boost leak.

 

I asked Ray about these upper seals that fit in the tapered section. He says he only knows about the tip insulator.

I have seen the upper seal in pictures but it is not called out in the shop manual.

Does anyone have the part number or do they come with the insulator tip seals.

 

i will check; hang on a sec

 

Yeah, the parts directory displays a tip insulator: N3A1-13-257. I didn't have a grommet or insulator between the tip of my primary rail and the diffuser... so I'm a little confused. The top of my diffusers have a rubber seal that presses against the tip of the primary rail. I am guessing that N3A1-13-257 is the o-ring/insulator that we are talking about here.

 

I think that is the insulator part number....

 

okay; i don't have a part number, but if you refer to your workshop manual pdf file (view the sticky posts in this 3rd gen forum), skip to page 293, and it shows you the breakdown.

 

hmm... yes after looking at it again you are correct. My car was missing that insulator...

I will take pics of what came out of my engine when I get home from work in a bit.

 

right; the injector baskets have a small rubber lip on the top of them; the only other piece is that o-ring.

 

Did you find a part number for the upper seal?

 

Sorry...I see your reply..thanks I will check the manual.

 

Sorry..but which one of the manuals I have check three so far?

 

Check this thread:
https://www.rx7club.com/3rd-gen-archives-73/injector-removal-reconditioning-replacement-232603/

 

This is what came out of my car:



It is possible that the previous owner left out a grommet... but everything was running fine. I am pretty sure that the o-ring around the primary rail provides the seal.

 

THankyou...thta is the o-ring I'm looking for. can some give Ray Crowe a part number, or can someone supply them to me?

 

wow i dont think my car had these either. nor those lower things.. is that the insulators? (referring to afterburn27's pic)

maybe mine are there and i just see the tops of them or something. i also dont have those o- rings on the top, does anyone have a part number where i can get them? would a cut piece of hose or something from o'Reilly's work?

 

Check the link I posted up above.

 

yeah i was just reading that and trying to make sense of all of it, i think some of my parts are missing so its a little unclear.. when i got my injectors back from witchhunter they put different pindle caps on that arent smooth on the bottom. they have 4 lil nubs in each corner. could that cause a vacuum leak?