Can someone explain this torque spec to me?

[wareaglescott]

Never seen one expressed like this. This is from the shop manual.

does 120 +20 mean something different than 140? Ive seen torque to a certain number and then an additional degrees of rotation but that does not seem to be what this is.

[walt]

That is an odd way to express. I think they are saying 120Nm +20/-0. So anywhere from 120 to 140 is acceptable.

[AG81]

You are exactly right Walt. I have seen spec's like this in our engineering industry.

[TimT]

Perhaps that means exactly what it says

(120 +20Nm) or (87 +14Lb /ft)

and should be interpreted as no lower than 120, or 87

[wareaglescott]

Thanks everyone.
Just seems like a strange way to list it.

[E Sully]

The part that I was always curious about is the amount and type of oil to add to the strut housing after installing the cartridge. From what I have been able to find, it is to aid in cooling the strut, but I have never seen the specs on type and quantity.

[Paulporsche]

It's fairly common for specs to be expressed this way. They idea is that you can't go below the amount shown but you can go a little above.

[Teutonics]

Originally Posted by walt

I think they are saying 120Nm +20/-0. So anywhere from 120 to 140 is acceptable.

I did not know this... In my ignorance, I would have interpreted to torque to the first spec, then add second spec to the wrench and re-torque to the higher value. (LOL!) I guess I would have still been within the acceptable tolerances...

I learn something new every day!

[Jon B]

Originally Posted by wareaglescott

...does 120 +20 mean something different than 140?

From the 70s factory manual.
12-14 mkp = 120-140 Nm, not precisely but close enough for Porsche to express in round numbers.