1993 K75S
OK, I had my first and last (hopefully) senior moment last night and would like to solicit your opinion on the drain bolt over-torque event I created.
After draining the transmission gear oil, I replaced the drain plug with a new crush washer. I set the torque wrench to 20 NM but really it was 20 Ft-Lbs, I didn't have my darn glasses. The required gear drain plug torque is: 20 +/- 3 NM. So in actual case, I applied 27 NM instead of 20 NM or the max allowable 23 NM. I actually stopped torquing when the wrench gave the audible click, but I had already started getting the "uncomfortable" this seems weird feeling.
It's been a few years since I wrenched, but I do remember from way back when that torque values are posted as accurate on dry bolts only. Lubrication of any kind skews the tightening torque value actually applied. Gear drain plugs are obviously always lubricated. So, with that in mind, my over torque may be even greater than 4 NM.
So what is your take on my stupidity, I mean, brain fart, considering the size of the drain plug and the metallurgy of the transmission case? In other words, do you think an over-torque of 4 - 8 NM will equate to internal thread damage to either the gear casing or magnetic drain plug?
OK, I had my first and last (hopefully) senior moment last night and would like to solicit your opinion on the drain bolt over-torque event I created.
After draining the transmission gear oil, I replaced the drain plug with a new crush washer. I set the torque wrench to 20 NM but really it was 20 Ft-Lbs, I didn't have my darn glasses. The required gear drain plug torque is: 20 +/- 3 NM. So in actual case, I applied 27 NM instead of 20 NM or the max allowable 23 NM. I actually stopped torquing when the wrench gave the audible click, but I had already started getting the "uncomfortable" this seems weird feeling.
It's been a few years since I wrenched, but I do remember from way back when that torque values are posted as accurate on dry bolts only. Lubrication of any kind skews the tightening torque value actually applied. Gear drain plugs are obviously always lubricated. So, with that in mind, my over torque may be even greater than 4 NM.
So what is your take on my stupidity, I mean, brain fart, considering the size of the drain plug and the metallurgy of the transmission case? In other words, do you think an over-torque of 4 - 8 NM will equate to internal thread damage to either the gear casing or magnetic drain plug?
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