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Re: Am I Just Lucky?
From: firstname.lastname@example.org (Orin Eman)
>> 1) To break my crank bolt loose, I used a 2 foot extension on a
>> 1/2" drive breaker bar.
>I did use the 5' pipe to break it loose, though I was pulling upwards
>meaning I would be putting considerably less than my weight on it...
Not necessarily. I (and most other people) can lift considerably more than
my weight. However, I can only push down with my own weight (I can of
course increase this if I wear a backpack full of stones). It's worth
remembering this when trying to loosen a wheel lugbolt by the side of the
road after some ape has tightened it with an air tool. Just a pedantic
point, but I'm feeling pernickity (sp?) today.
>> 2) My Bentley specifically shows the torque on the crank bolt to be
>> 258 lbs/ft., or 350 n-m.
(For info. only: It's lbs x ft, not lbs/ft, also it's Nm, not nm)
>For the 84-88 5k, the Bentley shows an extension tool (2079?) which is
>approximately 12" long. The given torque spec was for use with this
>tool only. Assuming a torque wrench of around 18" length, we calculated
>the torque at the bolt to be 400 - 500 ft-lb!
258 x (18 +12)/18 = 430.
>> 3) I hear a lot of discussion about using Loctite on the crank
>> bolt when re-installing it.
>The older Bentleys talk about a locking compound, hence the confusion.
>I hadn't heard the Anti-corrosion discussion when I did mine, so I
I had one come loose on me (I had the belt replaced by a workshop a year
previously). The car lost a LOT of power as the valves became very retarded.
It made a complete mess of the crank pulley and also did a slight bit of
damage to the crank.
Next time I do the job (I'm not going to trust the garage - I think either
they didn't use loctite or else used the wrong torque) I'm going to torque
it to about 500 lbs. That's the equivalent of me (about 200lbs) standing on
a extension 2.5ft long. That should hold it.
1984 Audi 80 quattro
1989 Audi 100 Avant