The car is a 1986 RX7 base model (non turbo). Mods limited to streetport, performance intake and exhaust, some cosmetics.

I just had the injectors cleaned (RC Fuel Injectors, Torrance, CA). The injectors work great (idle is smoother, seems like there might be a bit more power, and the 3800 rpm hesitation is 90% gone). But, I am having trouble with leaks at the top o ring on the injector. Pulling them out, I found damage to the periphery of the o ring. Reinstalled with new o rings, and oiled them with 10W30; pulled back out to see, and there still is damage to the outer edge of the ring, though much less than before.

What do the pros here think: am I not using enough oil? Should I be using a different lube? Do I need to lube the interior of the socket in the fuel rail as well as the o ring itself? Something else?

Tell me what you think...

 

i had the same issue on my miata, i had to heavily soak the top of the injector with oil, it seems the dripping gas eats the oil away FAST

 

I always rotate the injectors into the body of the rail, and so far I have never had an o-ring damaged.

 

I will try that tomorrow. Is motor oil the appropriate lubricant? thx

 

I'm sure it would be fine. The gas will eventually flush it away from the rubber anyhow.

 

Thx.

 

I just installed my injectors like a billion times in a row (I was trying to troubleshoot a leak which was eventually found to be in the side of the injector). And just using a bunch of motor oil all round the time of the injector and turning it back and forth while installing worked well for me.

you also want to make sure the o-ring is the same size as the original (11mm). a smaller o-ring will fit, but might cause leaks.

 

Installed the offending injectors today, new OEM o -rings, more oil this time, on the o ring and on the interior of the socket in the fuel raid. Gave them a little wrist action as they went in.

Static test (jumpered fuel pump test connector); no leaks found.

Initial driving test, including multiple full throttle accelerations to redline. No leaks so far.