I'm Torqued Off

[quk@sievers.com (Phil Payne)]

In message <199702262252.QAA08897@endeavor> "R. Cummings" writes:

> Torque on nut = 172*(1+1.5) = 430 ft lbs.

NO!
 
This represents almost 30% over-torque and may seriously damage the crankshaft.
 
Audi specifically states 450Nm (332 lb ft).

Of course, a philosophical approach might bring further insight.  When Audi 
designed the I5 engine, they probably decided what the harmonic balancer's 
torque should be _without_even_dreaming_about_ tool #2079.  They decided that 
the ideal torque would be 450Nm (332 lb ft).
 
Then - they decided that this was a bit excessive for a normal workshop.  Check 
the Snap-On catalogue for torque wrenches capable of 450Nm!!!

So they came up with #2079 and 350Nm (258 lb ft).
 
But - I respectfully submit - the engine _preceded_ the tool.  And thus the
(well documented) naked nut requirement of 450Nm (332 lb ft) probably predates
the 350Nm (258 lb ft) requirement with #2079.

Anything even close to 400 lb ft is excessive.  430 lb ft is downright 
dangerous.

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club