4g61t.org

G'Day all,

Jap spec 4G61T w/ TD04 turbo.

Can anyone provide the torque for the M6 (almost 1/4") nut on the turbo coupler through bolt? Turbo coupler being the split ring that loops around the flanges on turbo and turbine housing....

(a) The manual says to do it up to the specified torque, but fails to specify it. The only listings I can find say "turbocharger bolt and nut" or "exhaust fitting bolt" and both call out 43 ft.lbs. That seems a bit high to me for an M6 nut/bolt....
(b) it looks like a funky kind of nut, with some tabs that appear to provide some positive retention function
(c) with the above in mind, if anyone says "just do it up until it's tight" then i may scream...

Cheers,
Slaphead.

Every PDF I have just skips by that information. I'm going to undertake a proper Internet search on this one. Prepare to scream ... all articles that I could find, including the vfaq.com references in the turbo section, show everything but that spec. Very frustrating I know, but wouldn't it be best to tighten the nut to the spec that such a nut and material are designed for? I've gotten away from those specs but most repair manuals, like the infamous Haynes ones, show this type of info in the first 20 pages or so. It, then nut, looked like a locking type of sorts when I last saw my setup. Sorry I couldn't be of more help on that one.