Torque settings help

[anonymous-user]

[redacted]

[Liamjrhodes]

my understanding of those given values would be the tolerance of the required torque. If it is to have a send/third pass they are usually listed separately

[stevesingo]

It is unlikely that your torque wrench is calibrated. Set it to the middle of the two figures, and that is likely as near as you can get it.

[Liamjrhodes]

As said the torque wrench you are using probably isn't calibrated so set it to the mid value and you shouldn't be too far out

[227bhp]

It's possible one is oiled and the other dry.

[stevieturbo]

I would imagine the book states somewhere what they mean or the range is for.

[stevesingo]

227bhp said:

It's possible one is oiled and the other dry.

The value stated is a tolerance range. Elsewhere in the manual it will likely state what lubricant in needed for the bolts.

[Sardonicus]

stevesingo said:

The value stated is a tolerance range. Elsewhere in the manual it will likely state what lubricant in needed for the bolts.

The bit above in bold IMO ^

[JohnMcL]

Plenty of duff info here. Proper answer is available on any of the easily available torque charts, e.g. http://www.imagedy.org/metric-bolt-torque-spec-cha...

Usually, when two values are given without explanation, they are for plain / dry and plain / lubricated. Probably, the two values will be specified elsewhere in the OP's document. Plated bolts need yet another torque. Note, the nuts must be compatible spec and if the bolts are into castings the casting material may require modified torque.

Edited by JohnMcL on Thursday 20th June 10:39

Edited by JohnMcL on Thursday 20th June 10:44

[stevesingo]

JohnMcL said:

Plenty of duff info here. Proper answer is available on any of the easily available torque charts, e.g. http://www.imagedy.org/metric-bolt-torque-spec-cha...

Usually, when two values are given without explanation, they are for plain / dry and plain / lubricated. Probably, the two values will be specified elsewhere in the OP's document. Plated bolts need yet another torque. Note, the nuts must be compatible spec and if the bolts are into castings the casting material may require modified torque.

What if the bolts are torque to yield?

Although the thread diameter and pitch are not stated in the OP’s manual, we can compare to the standard torques laid out in your table and the comparison suggests you are wrong.

The head bolt torque for the 18 R variant is 73 - 86 (the hyphen should give it away) but 17% more torque dry.

M12x1.75 10.9 grade is 69.6 dry and 92.8 lubed or 33% greater dry toque.

This is a torque range. 11KgM +- 10% clumsily covered in to lbft 72.3301-86.7962lbft.

Never in 29yrs of working on cars have I seen an engine manual give on option of dry or lubed. They have always given an Instruction as to lube or not and a torque range.

You were right on one thing though.

Edited by stevesingo on Thursday 20th June 17:01

[JohnMcL]

Hi Steve,
I was wrong to say "usually" because my experience base is only 2 occassions that were as I described (both non-cars). That clearly does not compare with your experience and your arithmetic is compelling. So, thanks for the correction. Every day is....................

[stevesingo]

[stevieturbo]

Really...why not just read the manual to see what it states ?