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[JamesV6CDX]

I don't agree I'm afraid....

Bigger bolts will be a higher torque setting than a smaller bolts... else we would have 6mm bolts for Head Bolts.

But surely the torque setting is based around numerous other variables, such as the weight of the item / clamping force needed  - not solely determined by the thickness of the bolt?

The logic about having 6mm bolts for cylinder heads is a red-herring, because such a bolt wouldn't be able to structurally withstand the torques / stresses required, to hold down the weight of the heads on the block...

[Andy B]

I can't find any references to plenums at all in Mr Haynes, but I'd say that 8Nm is far too little - it's little more than a nip. 20Nm/15lbsft sounds more like it

[Darth Loo-knee]

I don't agree I'm afraid....

Bigger bolts will be a higher torque setting than a smaller bolts... else we would have 6mm bolts for Head Bolts.

But surely the torque setting is based around numerous other variables, such as the weight of the item / clamping force needed  - not solely determined by the thickness of the bolt?

The logic about having 6mm bolts for cylinder heads is a red-herring, because such a bolt wouldn't be able to structurally withstand the torques / stresses required, to hold down the weight of the heads on the block...

I think your totally missing the point

[JamesV6CDX]

I can't find any references to plenums at all in Mr Haynes, but I'd say that 8Nm is far too little - it's little more than a nip. 20Nm/15lbsft sounds more like it

I was also sceptical, the first time I read it - but I'm almost certain it's 8nm....

[RobG]

I can't find any references to plenums at all in Mr Haynes, but I'd say that 8Nm is far too little - it's little more than a nip. 20Nm/15lbsft sounds more like it

I was also sceptical, the first time I read it - but I'm almost certain it's 8nm....

Yep

[aaronjb]

Torque required is a function of the preload required on the bolt.. so I was reading the other day as I read the tech articles in the ARP catalogue.

A bolt works best when considered as a spring, so the desired torque setting is given to produce a desired 'stretch' in the bolt - assuming you are mating two incompressible things together..

When you're mounting something with a compressible separator, the preload is - I imagine - determined by the springiness & compressibility of the separator. O-rings in this case (very springy, highly compressible = little torque?) vs. headgasket (not springy, hard to compress = high torque required to achieve consistent preload across the life of the item?)

Something like that, anyway.. IANAME (I Am Not A Mechanical Engineer )

So sorry DLK, I tend to agree with James - I think you're missing the point

[Jimbob]

Seems to small....but James is correct, direct from TIS :

Intake Plenum, Remove and Install (Y 26 SE, Y 32 SE)

  Remove

Disconnect ground cable from battery.

Detach air intake hoses (1) from housing for resonance pipes switchover valve and throttle body.

Disconnect wiring harness plug (2) from throttle body.

Detach vacuum hose (4) from throttle body.

Detach coolant hoses (3) from throttle body.
 
Detach brake servo vacuum line (4) from intake plenum – counterhold on screw-on port.

Detach vacuum hoses (3) and engine vent hoses (2) from engine vent adapter.

Remove fastening bolts (6) from intake plenum and lay bracket aside.

Remove fastening bolts for sealing cap from intake plenum.

Remove fastening bolts (1 and 5). Carefully lay intake plenum aside – note seal rings.
 
Caution

Mask intake ducts – foreign objects can cause engine damage.

Detach vacuum lines (1) from solenoid valve for intake plenum switchover valve.

Detach wiring harness plug (2) from solenoid valve for intake plenum switchover valve.

Remove intake plenum and seal rings.

  Install

Place 6 new seal rings (3) on intake bridge – ensure correct installation position.

Attach vacuum line and wiring harness plug to solenoid valve for intake plenum switchover valve.
 
Note:  The intake bridge has two guide pins (arrows) for locking the intake plenum.

Attach intake plenum (1) to intake bridge – ensure correct seating – tightening torque 8 Nm / 6 lbf. ft.

Attach fastening bolts for sealing caps to intake plenum.

Attach brackets to intake plenum – 3 off.
 

Attach vacuum hoses and engine vent hoses to engine vent adapter.

Attach brake servo vacuum line to intake plenum – counterhold on screw-on port.

Attach coolant hoses to throttle body.

Attach vacuum hose to throttle body.

Attach wiring harness plug to throttle body.

Attach air intake hoses to resonance pipes switchover valve housing and throttle body.

Connect ground cable to battery.

Top up cooling system – see operations "Cooling System, Top Up and Bleed" and "Cooling System, Check for Leaks".

[Darth Loo-knee]

Personally I don't care... in my opinion 8nm is not tight enough for an 8mm bolt.

[RobG]

The precise torque value is 8021.923166667 Nm

[aaronjb]

Personally I don't care... in my opinion 8nm is not tight enough for an 8mm bolt.

I have a friend like that.. to him every bolt is considered 'tighten to yield' I have to keep him away from the tools during reassembly... (It took me 8 years to teach him to stop tightening when something is cross threaded, too.. )

[Andy B]

The precise torque value is 8021.923166667 Nm

surely that'll strip the threads in the ally!!! 

[Darth Loo-knee]

Personally I don't care... in my opinion 8nm is not tight enough for an 8mm bolt.

I have a friend like that.. to him every bolt is considered 'tighten to yield' I have to keep him away from the tools during reassembly... (It took me 8 years to teach him to stop tightening when something is cross threaded, too.. )

Cross threading is something totally different than stripping a bolt from over tightening... maybe you should try teaching yourself first 

[RobG]

The precise torque value is 8021.923166667 Nm

surely that'll strip the threads in the ally!!! 

8.021923166667 Nm
That better

[aaronjb]

Personally I don't care... in my opinion 8nm is not tight enough for an 8mm bolt.

I have a friend like that.. to him every bolt is considered 'tighten to yield' I have to keep him away from the tools during reassembly... (It took me 8 years to teach him to stop tightening when something is cross threaded, too.. )

Cross threading is something totally different than stripping a bolt from over tightening... maybe you should try teaching yourself first 

Er. I know that, thanks. I also know the difference between yield in a bolt and stripping the threads out of something. 

[Andy B]

The precise torque value is 8021.923166667 Nm

surely that'll strip the threads in the ally!!! 

8.021923166667 Nm
That better

I wouldn't use the torque wrench anyway so wouldn't know ............