Injector Isolators and O-Rings

[steve]

Quote:
I wouldn't trust a non OEM part for something that crucial to my car not burning up. They are really cheap and I would suggest getting all three of the parts on each injector:

Top of fuel rail side, o-ring: MD614813 (this seals fuel from leaking between the rail/injector)
Bottom of fuel rail side, "injector sheet": MD614805
Bottom of injector/intake isolator: MD087060 (this seals the injector to the head preventing boost leaks)
Fuel rail mounting isolators: MD095402 (x3)





Note: The O-ring part number has changed to 1465A188.

The o-rings (MD614813) and injector isolators (MD087060) should be replaced as a regular maintenance item, or especially if upgrading injectors and you're going to have them out anyways. The original ones are probably very hard, brittle, and dried up, leading to either a fuel leak or a vac/pressure leak. Use some dielectric grease when assembling and inserting into the head/rail to avoid tears.

old injector isolator:


new injector isolator:


Thanks to all the members who have contributed to this including keydiver, atc250r, and me. /ubbthreads/images/graemlins/grin.gif

 

[beavis]

its good that this has been mentioned. on my vr4 mine developed a boost leak on one of the injectors because the seal on the intake was so old and brittle. its amazing how well the car ran and behaved after doing the procedure above. even when we replace the injectors on the evo we require the owners to replace all the o rings.

 

[deez]

The O-ring part number has changed to 1465A188.