Do you really put 51 ft/lb on your oil tank drain bolt?
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Burning Brakes
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Do you really put 51 ft/lb on your oil tank drain bolt?
For a long time, I was too lazy to use my torque wrench on this drain bolt. I just felt it by hands. Recently, I force myself to use the torque wrench on it and I feel 51 ft/lb is WAY too much. Today, I had to adjust my torque wrench down to 40 ft/lb, and adjusted it up to 51 ft/lb 3 times to make sure my torque wrench is working. Above 45 ft/lb I was so affraid I will break something. I honestly feel between 40 and 45 ft/lb is more than enough. What do you guys think?
For a long time, I was too lazy to use my torque wrench on this drain bolt. I just felt it by hands. Recently, I force myself to use the torque wrench on it and I feel 51 ft/lb is WAY too much. Today, I had to adjust my torque wrench down to 40 ft/lb, and adjusted it up to 51 ft/lb 3 times to make sure my torque wrench is working. Above 45 ft/lb I was so affraid I will break something. I honestly feel between 40 and 45 ft/lb is more than enough. What do you guys think?
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Oh mine, I might switch them around. I just did 31 ft/lb on the case and 51 on the tank... because I thought the case is aluminum, it should take less torque compare to the steel tank. Arghhh. I hope I didn't damage the tank.
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I checked the 964 PET and the data is even less conclusive.
Chapter 2 covers maintenance. On page 83 it says the engine drain plug torque should be 52 ft/lb and the thermostat housing drain plug torque should be 48 ft/lb.
On page 20 of Wayne Dempsey's book, 101 Projects for your 911 Porsche it lists the torque for both of the drain bolts as 30.8 ft/lbs. .
I agree with you that these 22mm x 27mm aluminum washers crush nicely at 31 ft/lbs.
Good Catch,
Mark
Chapter 2 covers maintenance. On page 83 it says the engine drain plug torque should be 52 ft/lb and the thermostat housing drain plug torque should be 48 ft/lb.
On page 20 of Wayne Dempsey's book, 101 Projects for your 911 Porsche it lists the torque for both of the drain bolts as 30.8 ft/lbs. .
I agree with you that these 22mm x 27mm aluminum washers crush nicely at 31 ft/lbs.
Good Catch,
Mark
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Drain plug torque:
Engines with sump plate (oil screen cover) = 42 Nm (30 lb/ft)
Engines with plug in crankcase = 70 Nm (51 lb/ft)
Reservoir (oil tank) = 42 Nm (30 lb/ft)
Engines with sump plate (oil screen cover) = 42 Nm (30 lb/ft)
Engines with plug in crankcase = 70 Nm (51 lb/ft)
Reservoir (oil tank) = 42 Nm (30 lb/ft)
#6
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So perhaps I am the only one who has NEVER taken a torque wrench to any drainplug of any car. Never a leak, never had one stuck, and never had any stripped threads of any kind. Can't say I am "right," but it so far I have never been "wrong." ![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
Edward
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Edward
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#9
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Burning Brakes
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I never even had a torque wrench before I purchased my 911 (and barely knew how to turn a wrench) but I wanted to "learn" my car, so I acquired the knowledge and tools as I went along and have continued to do things "by the book" that many probably don't think twice about doing by feel. The first time I removed my oil plugs...I wished the previous wrench had used one
.
Keith
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Keith
'88 CE coupe
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Me too, I never used torque wrench on oil drain plugs untill a little while ago when Draco complain I always over torque. I guess always use torque wrench on everything can be bad too. I remember 31 and 51 but forgot which is which.
Still, I think 51 is way too much on the engine case. I did it again by hand, with without torque and tried again with torque. I think I am happy with more like 40 on the engine case. Do you think the bolt can have a chance to back out itself at 40 ft/lb?
Thanks guys.
Still, I think 51 is way too much on the engine case. I did it again by hand, with without torque and tried again with torque. I think I am happy with more like 40 on the engine case. Do you think the bolt can have a chance to back out itself at 40 ft/lb?
Thanks guys.
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there was a service bulletin for the 964 and they reduced the the torque on both the crankcase and the tank. i wll find out. 51 lbs is way to much.
eventually the the tank fitting will start to twist on the tank.
eventually the the tank fitting will start to twist on the tank.
#15
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Please refer to my above post, torque for the tank plug is 30 lb/ft, not 51 lb/ft...