Tightening torque -- engine oil & drive oil

[Constant Mesh]

These two bolts are very similar except for the permanent magnet in the drive drain bolt. Yet the tightening torques specified in the owner's manual are quite different.

Engine oil drain bolt -- 31 lb-ft.

Drive oil drain bolt -- 17 lb-ft.

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Drive oil filler bolt -- 17 lb-ft.

Why the different recommended torques? More vibration for the engine drain bolt? Losing either drain bolt would be catastrophic.

 

[Kaelaria]

Vibration, heat, number of contact threads, alloy used in the casings...

 

[nusman68]

-Better be careful; there have been numerous reports of owners stripping the threads torquing up the drain bolt to the 'specified' 31 ft lbs.

Do a search, read for yourself. I put on a new crush washer & tighten it until I feel it deform; many others just use a plain copper gasket and snug it up.

 

[Constant Mesh]

I don't use a torque wrench. I use a standard length 3/8" socket ratchet. I replaced the crush washer with a reusable flat aluminum washer that is used on Honda car engine drain bolts.

 

[painman]

As mentioned here and in many posts, don't do the 31 lb. torque dance on the oil pan. I used 25 lbs. and it worked fine. Some just go by feel or until the washer is crushed if that is the type used. Oil pans use less thread than final drive threads. PM. <><

 

[Constant Mesh]

More than six threads is useless anyway.

https://www.gizmology.net/nutsbolts.htm

 

[bluesfool]

More than six threads is useless anyway.
https://www.gizmology.net/nutsbolts.htm

Man, the things you can learn from this board are endless! I never stopped to think there was a whole science to nuts and bolts...that was actually pretty interesting!

 

[warsw]

More than six threads is useless anyway.
https://www.gizmology.net/nutsbolts.htm

Good Info. I have read most of this before but some of the stuff was new and explained very well. Thanks for the education.