Exhaust manifold/riser torque specs

[scotchipman]

Does anyone have the exhaust manifold to head and riser to manifold torque specs for a 2015 PCM ZR409 6.0 engine? I don't think the engine type makes a difference? I did find this torque calculator HERE but not sure what bolt class I have?

[biacs]

I don't have the link for my 2006. But I use 15 foot pounds on all four and then re-torque them again to 25 for final torque spec.

Also, my bolts and lockwashers had become very nasty looking. So I went to my local ace and got a new set of bolts. I used the highest grade I could get.


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[scotchipman]

Thanks for the reply, where did you find the link for your official specs? I did the job on the 16th and ended up going with 17.4 ft-lbs using https://www.fastenal.com/fast/servic...Punchout=false and a dry Grade 5 bolt. Interesting note, when I removed the manifold bolts there were not very tight at all. I will keep an eye on them and re-torque when I get the official specs.

[Scooter G]

You should be in the neighborhood at 17 lbs, follow up with a check after a day or 2 out. If they seem to loosening any on you, grab some thread locker (high temp).
The following is just generic info across Ford & Chevy, there may be other opinions, some say 11, some 22, some 33. I have busted a bolt in the block going in, and coming out a time or 3, not fun. Exhaust torque is not quite as crucial as in the internals, heads & intake.

Apply a 5 mm (0.2 in) wide bead of high temperature thread locker to the threads of the exhaust manifold bolts before installing.
Important: When tightening the exhaust manifold bolts it should be done with two passes. First tighten the two center bolts on the exhaust manifold. Then tighten the rest of the bolts, alternating from side to side, while working towards the outside bolts.

Tighten to 10 N·m (89 lb in) on the first pass. (approx. 7.5 lb ft)
Tighten to 20 N·m (15 lb ft) on the final pass.

[David.S]

You should be in the neighborhood at 17 lbs, follow up with a check after a day or 2 out. If they seem to loosening any on you, grab some thread locker (high temp).
The following is just generic info across Ford & Chevy, there may be other opinions, some say 11, some 22, some 33. I have busted a bolt in the block going in, and coming out a time or 3, not fun. Exhaust torque is not quite as crucial as in the internals, heads & intake.

Apply a 5 mm (0.2 in) wide bead of high temperature thread locker to the threads of the exhaust manifold bolts before installing.
Important: When tightening the exhaust manifold bolts it should be done with two passes. First tighten the two center bolts on the exhaust manifold. Then tighten the rest of the bolts, alternating from side to side, while working towards the outside bolts.

Tighten to 10 N·m (89 lb in) on the first pass. (approx. 7.5 lb ft)
Tighten to 20 N·m (15 lb ft) on the final pass.

Hello,
Looking for the torque specs, manifold riser for a 2000 correct craft air nautique. Engine PCM40 5.7 liter?
Thank You

[David.S]

Just to confirm I'm talking about the risers connect to the exhaust, not the manifolds. 17lbs of torque should be okay? Thank you for your time, very appreciated

[Scooter G]

17lbs isn't a grizzly bear on a torque wrench. If it where me, and I can feel 45 to 140lbs without a torque wrench, not a brag, we used to run bets on who could get the closest without a torque wrench, I would start at 17 and re-check after a good run or 2. But go off your feel & your gut, does it feel tight enough, I wouldn't run any more than 45lbs on those. Not sure what grade bolts are on your risers? Again, the externals aren't as crucial as the internals.
If anyone would know for certain, it would be NautiqueJeff, he's change more manifolds & risers than I've changed (fill in the blank).