Injector seal breaking down
#1
Injector seal breaking down
I just popped my primary rail out of the block today due to a leaky injector. I have a set of freshly cleaned and flow balanced injectors ready to go in, but when I got the primary rail out I was very shocked and stumped. The injector seals where the rail meets the block were completely broken down and falling apart. These are only 8000mi old. I had a primary rail leak at these seals the first time I put them in so I bought a new set and made sure I was very careful when putting them in. I used white lithium grease to get the rail to slide in and seal nicely.
So I guess what I wanna know is, did I do something wrong? And is there any suggestions on how to put the primary rail and injectors (primary and secondary) in? Thanks.
So I guess what I wanna know is, did I do something wrong? And is there any suggestions on how to put the primary rail and injectors (primary and secondary) in? Thanks.
#2
Moderator
iTrader: (7)
I think you're looking at the injector grommets (chunky, soft rings of rubber). These are not part of the system that seals the pressurized fuel from leaking (the o-rings on the injector do all that); actually they just prevent injected fuel vapor from working back up into the engine compartment.
Since these are soft rubber, they tend to get a little bit pinched and look broken down. IMO, this is not a big deal, since as long as they're largely intact they will do the sealing they need to do. If they are only 8k old I think it's safe to say that's the case here, unless they were really pinched the last time they were put in. The good news is they are only a couple bucks each should you choose to replace them.
Dave
Since these are soft rubber, they tend to get a little bit pinched and look broken down. IMO, this is not a big deal, since as long as they're largely intact they will do the sealing they need to do. If they are only 8k old I think it's safe to say that's the case here, unless they were really pinched the last time they were put in. The good news is they are only a couple bucks each should you choose to replace them.
Dave
#3
Originally Posted by dgeesaman
I think you're looking at the injector grommets (chunky, soft rings of rubber). These are not part of the system that seals the pressurized fuel from leaking (the o-rings on the injector do all that); actually they just prevent injected fuel vapor from working back up into the engine compartment.
Since these are soft rubber, they tend to get a little bit pinched and look broken down. IMO, this is not a big deal, since as long as they're largely intact they will do the sealing they need to do. If they are only 8k old I think it's safe to say that's the case here, unless they were really pinched the last time they were put in. The good news is they are only a couple bucks each should you choose to replace them.
Dave
Since these are soft rubber, they tend to get a little bit pinched and look broken down. IMO, this is not a big deal, since as long as they're largely intact they will do the sealing they need to do. If they are only 8k old I think it's safe to say that's the case here, unless they were really pinched the last time they were put in. The good news is they are only a couple bucks each should you choose to replace them.
Dave
Also is there any tricks to get the injectors into the rails so they have a better chance of not leaking? Primarys and secondarys...
#4
Senior Member
iTrader: (3)
Originally Posted by Cgotto6
Also is there any tricks to get the injectors into the rails so they have a better chance of not leaking? Primarys and secondarys...
#5
Moderator
iTrader: (7)
Originally Posted by Cgotto6
They were extremely borken down. Like falling into little pieces. It seems like a chemical breakdown to me. Is white lithium grease what I should be using to seat the primary rail into them?
Also is there any tricks to get the injectors into the rails so they have a better chance of not leaking? Primarys and secondarys...
Also is there any tricks to get the injectors into the rails so they have a better chance of not leaking? Primarys and secondarys...
I would use a touch of motor oil on the o-rings to seat the injectors in the rail. Just moisten the walls of the rail bore. Work them in by twisting the injector and applying pressure - take your time. If they will only go in 95% of the way don't sweat it since the metal injector covers will push it tight.
Dave
Last edited by dgeesaman; 12-14-05 at 09:54 AM.
#7
Originally Posted by Cgotto6
They were extremely borken down. Like falling into little pieces. It seems like a chemical breakdown to me. Is white lithium grease what I should be using to seat the primary rail into them?
Also is there any tricks to get the injectors into the rails so they have a better chance of not leaking? Primarys and secondarys...
Also is there any tricks to get the injectors into the rails so they have a better chance of not leaking? Primarys and secondarys...