I went to replace the o-rings, grommets and insulators on the weekend and ran into a minor puzzle. The o-rings, grommets and insulators are the same as the s4 NA, except that the s5 parts fiche shows 2 more o-rings between the insulator and the diffuser.



I ordered the 'extra' o-rings from the dealership anyway.



It's odd. The parts fiche identifies the lower o-rings with the same code as the upper (although I doubt they'd fit over the cap without stretching all to hell) except for that longer 'sub-code,' 99541-01252. The parts guy ordered the longer code and you can see what we got.

Just where are these o-rings meant to go? Putting two of them between the insulator and the diffuser doesn't sound right at all.

 

They go on the plastic diffuser that sits undneath the injector. There's a picture here: http://www.mazdatrix.com/c-6.htm.

 

right, they go on the air bleeds.

 

Yeah I think its 2 per air bleed socket, but don't quote me on that. Its been a number of years since I did the injector work.

 

Primaries all use two because of the air bleed opening. S4 secondaries only use one because of the lack of secondary air bleeds. And then S5 secondaries also use two.

 

Thanks. I'll be taking them back.