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Torque Values for Fill and Drain Plugs

Old 05-09-2019, 12:25 PM
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Torque Values for Fill and Drain Plugs

I've got a 1990 4runner, 3.0V6, manual transmission. I'm changing the fluids in my transmission, tcase, and front/rear differentials. I'm not finding their respective fill and drain plug torque values for my generation. They're not in either of my service manuals. I'm finding writeups for later generations, but I don't know what's the same or different between generations. Can anyone provide some insight?
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Old 05-09-2019, 12:54 PM
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The manual only states to reinstall the fill and drain plugs "securely." http://web.archive.org/web/201210210...nce/2maint.pdf

How much is securely? (if you're wise enough to use a torque wrench) The FSM DOES specify 15 ft-lbs for the drain plug to an automatic transmission. http://web.archive.org/web/201408160...38onvehicl.pdf

Personally, 15 ft-lb is what I use. I can always tell a vehicle that has been serviced at "quickie oil" shop. What they fear as much as anything else is having a drain plug work loose on a customer. So they get the biggest gorillas they can find and equip them with a 1/2" drive "breaker bar" to reinstall the drain plugs. Which means the plug is put in with well north of 50 ft-lbs, which is WAY too much.

The 27 ft-lbs suggested in your reference is probably not TOO much. But I'm sticking with 15.
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Old 05-10-2019, 06:24 AM
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its got a washer on it that is meant to be softer than the steel around it, so it will sandwich and seal the hole. hand tight. if it leaks, its not tight enough. also use new washers.
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Old 05-14-2019, 12:10 PM
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Hand tight ain't gonna cut it.


Remember: always open the fill plug first!
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Old 05-14-2019, 03:04 PM
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I only use hand tight.

Of course, my hand is on the far end of an 18" torque wrench.

(I think it's "finger tight" that won't work.)
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Old 05-15-2019, 09:02 AM
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German torque spec is
Gootntight...
For what it's worth... I've been changing lubricants and fluids on my vehicles for decades, without a torque wrench...
I've never had a plug ... ever back off or fall out... got them nice and snug, called it good.

Last edited by 87-4runner; 05-15-2019 at 09:04 AM.
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