('09-'13) front differential drain plug - Subaru Forester Owners Forum
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post #1 of 12 (permalink) Old 08-15-2011, 08:41 AM Thread Starter
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front differential drain plug

Is it pretty hard to loose the drain plug of front differential?

I used a T70 bit and a torque wrench. Even the torque is at 70 ft-lb, I still couldn't loose the plug. It surprise me a little bit considering the tighten torque is supposed to be set at 32.5 ft-lb.

Does the drain plug follow the normal "righty tighty lefty loosey" rule? Any suggestion PB-blaster? or 18" breaker bar?

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post #2 of 12 (permalink) Old 08-15-2011, 09:51 AM Thread Starter
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Btw: Any one knows the part-number of the gasket used on the drain plug?
My dealer couldn't find the gasket for me.

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Originally Posted by intelmilan View Post
Is it pretty hard to loose the drain plug of front differential?

I used a T70 bit and a torque wrench. Even the torque is at 70 ft-lb, I still couldn't loose the plug. It surprise me a little bit considering the tighten torque is supposed to be set at 32.5 ft-lb.

Does the drain plug follow the normal "righty tighty lefty loosey" rule? Any suggestion PB-blaster? or 18" breaker bar?

2009 AT 2.5X Premium / All-weather package
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post #3 of 12 (permalink) Old 08-15-2011, 09:53 AM
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Re-use the washer.. it's a good copper one.
Standard threads. Sometimes they are tight.

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post #4 of 12 (permalink) Old 08-15-2011, 10:33 AM
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And you really should never use a torque wrench for loosening, it damages them.

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post #5 of 12 (permalink) Old 08-15-2011, 11:32 AM
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Quote:
Originally Posted by RadcomTxx View Post
And you really should never use a torque wrench for loosening, it damages them.
Exactly

Expect to apply 2,3, or 4 times the torque to loosen.

You will need an 18" breaker bar and good leverage to loosen it. Ramps are great here.

Re-use the copper washer.

Be careful what you wish for.
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post #6 of 12 (permalink) Old 08-15-2011, 08:48 PM
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I thought the torque on the front diff plug was supposed to be about 51 ft-lbs? Oil pan is 32 ft-lbs and AT drain plug is 19 ft-lbs. Unless there's a lot of difference between the 08 OBW and the 09 Foresters.

Newest front diff washers aren't copper any more. Just did the wife's car front diff last night and the washer looks for lack of a better term, odd. Its metallic, but not a chunk of steel.

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post #7 of 12 (permalink) Old 08-15-2011, 10:00 PM
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Front diff torque:
Aluminum gasket
44 Nm (4.5 kgf-m, 32.5 ft-lb)
Copper gasket
70 Nm (7.1 kgf-m, 51.6 ft-lb)

Rear diff torque:
49.0 Nm (5.0 kgf-m, 36.2 ft-lb)

ATF torque:
25 Nm (2.5 kgf-m, 18.1 ft-lb)

Engine oil torque:
44 Nm (4.5 kgf-m, 33 ft-lb)

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Last edited by Lovesubaru; 08-15-2011 at 10:12 PM.
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post #8 of 12 (permalink) Old 08-16-2011, 03:51 AM
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Well, I guess aluminum is cheaper than copper.

Any opinions as to whether or not I should I retorque, replace, or leave alone the aluminum one on the front diff that I over-torqued?

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post #9 of 12 (permalink) Old 08-16-2011, 05:08 AM
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I might break it free and retorque it to make it easier to remove next time. But I would leave the washer alone.

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post #10 of 12 (permalink) Old 08-16-2011, 05:44 AM
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Quote:
Originally Posted by flstffxe View Post
I might break it free and retorque it to make it easier to remove next time. But I would leave the washer alone.
Thanks, if you think I can get away without replacing the washer, I'll give it a shot.

I've leanred with hers that its a tad over 5 cups that come out when I do it on the ramps, and I wouldn't be worried about reusing the stuuf that I just put in.

Actually, the stuff that had 15k on it was just about pristine. Makes me very happy that hings are wearing so good.

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post #11 of 12 (permalink) Old 08-16-2011, 06:35 AM
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No issues reusing the crush washers as long as there is no debris on the mating surfaces. I wouldn't do any thing more then break it free and then retorque it. Again, my only reasoning in doing that is to make it easier to pull out after the next XX,000 miles.

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post #12 of 12 (permalink) Old 08-16-2011, 07:18 AM
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Quote:
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..... Again, my only reasoning in doing that is to make it easier to pull out after the next XX,000 miles.
I agree. By the time that aluminum corrodes I'll probably need a blowtorch. I'll retorque it tonight. Should have looked to see the torque for the different type washer, just didn't think about it.

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