Torque Inline 6 Head Question

nrowles · Jan 17, 2019

I am going to be putting a head on my inline 6 this weekend. I have the torque spec and pattern. This particular head you start in the middle and work outwards towards each end. My question is.........should I torque in steps or all in one go? For example should I snug the bolts and then do the full pattern at 60 then 80 then 90? Or snug them up and go straight to 90 ft lb?

T.R.K. · Jan 17, 2019

I bet someone on here has a manual and would look it up for you, if we knew which inline 6 you are working on.

mhb@ufe · Jan 17, 2019

I would do 30 - 60 - 90 and go over them a second time at 90.

Mark

nrowles · Jan 17, 2019

(quoted from post at 18:35:14 01/17/19) I bet someone on here has a manual and would look it up for you, if we knew which inline 6 you are working on.

I have a 664 page service manual and it says to torque "alternately and evenly". It is a Silver Diamond 220.

nrowles · Jan 17, 2019

(quoted from post at 18:49:13 01/17/19) I would do 30 - 60 - 90 and go over them a second time at 90.

Mark

Noted.

rustred · Jan 17, 2019

you ALWAYS torque a head in steps. dont matter what engine your working on. and you ALWAYS start in the middle and work out wards. you could do the 30,60, 90 thing, then a final 90 ft. lb. check. never torque one bolt to 90 right off the bat. you want a nice even torque through out without straining stuff. make sure the bolt threads are clean and oiled or use never seize or copper coat.

leroy in ne · Jan 17, 2019

IHC correct?

SVcummins · Jan 17, 2019

I always do them In about 5 or six steps

Steve@Advance · Jan 17, 2019

Does the manual mention a retorque when it is up to temperature?

I like to do that, especially on the older engines with thick composite gaskets. Bring it up to temperature, then run the torque pattern again. It helps to very slightly back each bolt off, just enough to feel it move, not relax the pull, then take it to full torque.

Adjusting the valves again is also good practice. After the initial run in, everything settles in. If the head gasket compresses some more, the adjustment will be changed.

nrowles · Jan 18, 2019

Yes, IHC.

There is no mention of re-torque after up to temperature. For 600+ total service pages the instruction if pretty vague on the process.

Leroy · Jan 18, 2019

Truck engine from about 1950, that was what was in our 1950 one ton whem we got it Did not realize the head-manifold was bad. Was replaced with a BD Black Diamond 220.

Torque Inline 6 Head Question

nrowles

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T.R.K.

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mhb@ufe

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nrowles

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SVcummins

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nrowles

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