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  #1  
Old 04-06-2012, 07:43 PM
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Angry Oil change -- did ft-lb instead of newton meters ...

So I was in a hurry, looking at Ft-lb instead of n-m, and was probably at 50nm (instead of 40nm) on drain plug when I realized my mistake. Filter nuts probably reached 30nm (instead of 20nm) None of them got stripped, and I loosened/re-tightened the oil filter nuts to proper torque. I didnt touch the drain plug, but am considering replacing the copper washer with the 'non-copper' one from the filter box and torquing it properly..? I'm worried if it will fail somehow when heated up. Advice?? Insults??

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Old 04-06-2012, 08:20 PM
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Have a beer and forget about it until the next oil change.
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Old 04-06-2012, 10:02 PM
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Over tightened an oil drain plug??? Could have gone to the quick lube & not gotten dirty if you were going to do that!!!
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Old 04-06-2012, 10:12 PM
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Quote:
Originally Posted by Junkman View Post
Over tightened an oil drain plug??? Could have gone to the quick lube & not gotten dirty if you were going to do that!!!
I know, right? fck my life! and english units!
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Old 04-07-2012, 12:11 AM
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Quote:
Originally Posted by ah-kay View Post
Have a beer and forget about it until the next oil change.
THIS.

I don't use a torque wrench for my oil changes. Wheel installation yes, but not oil drain plugs and filter housing nuts. When I was working on customers' cars and did something fancy like a 911, then I'd get the torque wrench out, but it was probably overkill even then.
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Old 04-07-2012, 12:56 PM
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You don't say whether it's a 603A (aluminum pan) or 617(A) (steel pan), so I can't comment on that bolt/"nut" interface. For a Cadmium plated (probably what our older bolts are, rather than newer enviro/"green" zinc), 4.8 grade (cheezy), 12 mm bolt torqued to 50 Nm, the resultant load corresponds to a 90% proof strength torque; right at the limit for what you would aim for as a designer. If it's 4.8, 14 mm, 50 Nm, then it's about 55%. 4.8, 16 mm, 50 Nm, 37%.

I can also tell you that, on the filter housing, 30 Nm (/ 1.356 ~= 22.1 ft-lb), on a Cadmium plated (probably what our older bolts are, rather than newer enviro/"green" zinc), 8.8 grade, 8 mm bolt corresponds to a 90% proof strength torque; right at the limit for what you would aim for as a designer. Buuuut, the flange nuts on the housing would have a much greater frictional torque (due to greater action radius of that mating friction) than these engineering formulae are set up to calculate, so correspondingly less load would be applied to the fastener shank.

The "not copper" washer is probably dead-soft, commercially-pure aluminum, which has similar sealing/crush properties.

Quote:
Originally Posted by ah-kay View Post
Have a beer and forget about it until the next oil change.

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