Fuel Injector rail torque - ClubLexus - Lexus Forum Discussion


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Fuel Injector rail torque

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Old 04-01-17, 12:39 PM   #1
sparkyguy
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Default Fuel Injector rail torque

Replaced all seals on stock Fuel Injectors as part of starter replacement.
The fuel-injector supply rails each have 2 nuts that pull the rails down onto the injectors.
My question is:
How tight are the nuts suppose to be? Obviously, they need to be tight enough to seal, but it is difficult to know when to stop tightening so I don't crush the seal where the injector sits into the bottom plenum section but tight enough so they don't leak as they age. Does the FSM list a specific torque? I'd anticipate it might only only be in inch-pounds since it is tightening against the rubber seal and not metal on metal.

Without a torque spec, I'd guess I should tighten them so that all injectors could no longer be rotated with my fingers (barely sealing against the plenum) and then tighten a bit further. However, that seems kinda sloppy and allows for too much guesswork.

Can anybody with a FSM offer advise on what the bible says?
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Old 04-01-17, 03:02 PM   #2
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Not a bump, but on another forum, I found another posting that said he "thought he remembered" the 1UZ fuel rails get tightened to 14 ft-lbs.
Can anyone confirm?
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Old 04-02-17, 06:41 PM   #3
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For a 92 SC300 here is the spec. Not sure what it would be on a 400?
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Old 04-09-17, 02:02 PM   #4
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My left fuel rail had a heli-coil in it that I discovered upon disassembly for a fuel leak/odor problem. The heli-coil was n't inserted all of the way, causing the leak Put it on the milling machine and removed .003 and cured the problem.
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