RE: [DMCForum] Angle Torque... what the hell?

["Travis Goodwin" <tgoodwin@xxxxxxxxxxxx>]

Why not just recalculate as a torque setting since it's still a rotational
force? Has anyone actually done this as the manual suggests?

> -----Original Message-----
> From: timnagin [mailto:timnagin@xxxxxxxxxxxxxx]
> Sent: Tuesday, July 22, 2003 11:37 AM
> To: DMCForum@xxxxxxxxxxxxxxx
> Subject: RE: [DMCForum] Angle Torque... what the hell?
> 
> This had me curious as well, so I found a few different explanations...
> 
> "This method, also known as turn of the nut method, was introduced for
> manual assembly shortly after the second World War when a certain
> tightening
> angle was specified. The method has been applied for use with power
> wrenches, the bolt being tightened to a predetermined angle beyond the
> elastic range and results in a small variation in the preload due, in
> part,
> to the yield stress tolerance. The main disadvantages of this method lie
> in
> the necessity for precise, and, if possible, experimental determination
of
> the angle; also the fastener can only sustain a limited number of
> re-applications before it fails."
> 
> http://www.boltscience.com/pages/tighten.htm
> 
> 
> "Sometimes when using old head bolts, and when using metal to aluminum
> composite heads, etc., automotive manuals call for torque angle. This
> simply
> means that after correctly torquing the head bolts to 85 ft. lbs. (in
your
> case), turn the bolt another one eighth of a turn, as in 360 degrees
would
> be a complete circle.
> 
> With today's more precise engineering practices, measurements in
> automotive
> components have become more critical. Exact clearance and torque
> specifications must be followed, otherwise, expensive automotive
> components
> will rapidly turn into scrap metal."
> 
> http://www.geocities.com/Athens/Olympus/8947/QA13.htm
> 
> 
> The above example is not YOUR case, it is in the case of the person
asking
> the question on that page.
> 
> Greg
> 
> 
> -----Original Message-----
> From: Travis Goodwin [mailto:tgoodwin@xxxxxxxxxxxx]
> Sent: Tuesday, July 22, 2003 10:47 AM
> To: 'DMCForum@xxxxxxxxxxxxxxx'
> Subject: RE: [DMCForum] Angle Torque... what the hell?
> 
> 
> Of course I don't. That's why I'm asking!
> 
> It is angle torque. I'm looking at the manual for installing the head
> bolts
> on the B28F. It says, and I quote:
> 
> Angle torque cylinder head bolts
> 1. loosen all bolts in sequence
> 2. tighten all bolts 15-20 Nm in sequence
> 3. angle torque 113-117 degrees in sequence. Use protractor 5098. Use
> rocker
> arm shaft as a line of reference when torquing.
> 
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> 
> 
> 
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