Injector Retainer Torque?

[TDIRyan]

What torque spec did you tighten your injector retaining nut to? I'm going to retorque mine this weekend, but don't know what to put them to.

(yes, I mean the injector retainer, not the nozzle retainer)

 

[Radman]

I believe the spec says 20 or 25 FT/LBS. I usually go to 30 to ensure no compression leaks. Did you install new copper washers on the injectors? If so your probably fine with 25 FT/LBS. If you re-used the old ones then go higher like 30 to 35. Do not overtighten as you may strip the threads.

 

[TDIRyan]

I'll keep that in mind. I just tightened mine till they were tight. I didn't have a torque wrench at the time. I did use new washers though.

 

[reiddo1]

The Bentley manual says 15 ft-lb; I learned the hard way and looked in the manual after twisting off the clamp bolt on #1 injector by torquing to 45 ft-lbs. Luckily the bolt was broke where I could drill the center out and remove it with no harm done. All mine are now set at 15 ft-lb with no leaks from a soap test.

 

[FlyTDI Guy]

Just to restate what reiddo1 has said... 15 ft/lbs. I have gone up to 17 or so but 25-30 is too much. It doesn't take much factoring in the leverage the holdowns deliver.

 

[Radman]

My bad

You are right. I rememberd it was less that what my torque wrench starts at. My wrench starts at 25LBS so I set it there and have had no problems. Changed over 50 sets of nozzles. If I reuse the old washers ill go to 30LBS to make sure they seat properly.

 

[FlyTDI Guy]

No biggie... after reading more than one post about folks snapping off their pivot studs and having to struggle to easy-out them, I just figured an extra word of caution was in order. I re-use the washers all the time. Surface them w/some 400-1200 iron-oxide type sandpaper (MCKA wet/dry) heat them to cherry red then quench them in some oil/bio/water etc. and you're good to go.