Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Direct Injector Seal Installation

Calum · 08-01-2013, 11:15 AM

I finally had a chance to watch the video and read this thread. Thanks a ton for the great info here.

I have no inside info on the injectors or seals, but I can make a couple of educated guesses on some things. First, the bevel on the injector shaft just above the seal looks like it would aid in sealing as the gasket was push against it. Instead of just moving a little, the gasket should spread and seal between the injector shaft and wall around it. I've worked with high pressure seals that work very similarly. They're adjustable to get more use out of the seal.

Second, a stronger seal would certainly be good, but the seal clearly has to be stretched over the injector tip and that would drastically limit the material choices. If it wasn't for that an asbestos seal would work perfect.

I'm curious as to why this method of seal is used though. Why not use a copper o-ring at the top and just let the small cavity fill with carbon?

08-01-2013, 11:15 AM	#104
Calum That Guy Join Date: Dec 2011 Drives: 2013 asphalt FRS MT Location: Halifax, Nova Scotia Posts: 4,865 Thanks: 5,058 Thanked 2,867 Times in 1,499 Posts Mentioned: 82 Post(s) Tagged: 1 Thread(s)	I finally had a chance to watch the video and read this thread. Thanks a ton for the great info here. I have no inside info on the injectors or seals, but I can make a couple of educated guesses on some things. First, the bevel on the injector shaft just above the seal looks like it would aid in sealing as the gasket was push against it. Instead of just moving a little, the gasket should spread and seal between the injector shaft and wall around it. I've worked with high pressure seals that work very similarly. They're adjustable to get more use out of the seal. Second, a stronger seal would certainly be good, but the seal clearly has to be stretched over the injector tip and that would drastically limit the material choices. If it wasn't for that an asbestos seal would work perfect. I'm curious as to why this method of seal is used though. Why not use a copper o-ring at the top and just let the small cavity fill with carbon? Last edited by Calum; 08-01-2013 at 01:46 PM.