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Rear axle differential - 650 mL? V70-XC70

posted by  pbierre on  Thu Mar 21 10:19 CST 2019
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last visit: Sun Mar 30 18:53 CST 2014
[RELATED]

My '04 XC70 AWD is at 118K mi (150K km). As part of the AWD service, I decided to change the gear oil in
the rear axle diff. (This is NOT about the Haldex -- that was a success).

I pumped out 400 mL of old oil, came out brownish so not too bad. I started pumping in new gear oil

Volvo 31367238 1 L

I was expecting to stop when it spilled out the plug hole, but got to 800 mL added and still nothing. So I stopped there.

I am unhappy with the results. My car is dripping gear oil. The plug was tightened with a new copper washer
(Volvo 11998), and it's not leaking from the plug.

I went back a 2nd time, and pumped out 150 mL, bringing it down to 650 mL. New washer. IT STILL LEAKS.

Where is the leak? Isn't this a sealed chamber?

What is the correct volume of oil?

To clean up the spillage, can I remove the fiberglass "truss" (8 bolts) that sits directly under the rear axle differential? Any hazard to removing this part? Seems like more than just a "cover" having 8 large bolts.





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