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Discussion Starter · #1 ·
I am having trouble feeding a narrow tube into the rear differential (via the filler plug) in order to pump out the old gear oil. The tube seems to get blocked about 1/2" after entry, and even a narrow tube can't be bent around the obstruction (the gears I presume) in order to get to the bottom of the housing. I have tried turning the wheels while the car is up in the air to no avail.<p>The car is a 2001 XC70 AWD. I have searched for any info on this issue and haven't been able to find anything. The rest of the fluid changes (tranny, bevel gear) went fine with info from this and other forums.<p>Any words of advice would be much appreciated!
 

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Thanks for the ideas--I'll try them this evening when both the car and I are in the same location.<p>The drain plug is in an awkward position, so the only way I'll be able to see into it might be with a mirror. It's a tight fit to get a socket onto the plug--one poster suggested using a swivel socket with a 6" extension but I was able to get a standard socket with a short extension on it.<p>So far as I can see from physical inspection, and consistent with what I've read online, there doesn't appear to be any drain plug in these units.
 

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Discussion Starter · #4 ·
Update

Well I tried the mirror and flashlight but all I could see was a smooth, dark surface that is blocking entry of the tube. Turning one rear wheel turns the other, so the gears in the differential are turning. But when the gears turn this dark surface does not. No matter what I try I can't bend the tube around this surface to snake it down into the gear oil (the tube has an O.D. of 0.3"). When I withdraw the tube, I do have gear oil on the end of it (so I'm pretty darn sure it's the right filler plug--it has a 13mm bolt, an aluminum crush ring just like the oil and angle gear plugs, etc.)<p>I took a photo of the opening. The hole points towards the driver side front wheel. The photo is shot from the middle of the undercarriage looking towards the rear end.<p>I'll look for a diagram of the rear diff to make sure there isn't a drain plug hiding somewhere (I looked again but couldn't find one) or try to get some help from my local dealer. But any other help would be appreciated.<p>http://s1013.photobucket.com/albums/af260/PhredinBend/?action=view&current=IMG_3684.jpg]<IMG SRC="http://i1013.photobucket.com/albums/af260/PhredinBend/th_IMG_3684.jpg" BORDER="0"> <BR><BR>
<i>Modified by Phred at 11:24 AM 7-19-2009</i>
 

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I admire your determination, but I wonder how badly the oil needs to be changed? I know the rear end of an XC70 doesn't get used very much.<p>I'd say Volvo intended the rear diff to be left alone, and installed some quality syn gear oil.<p>
 

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Re: Trouble Draining Rear Differential (Phred)

This message is bit late but I only joined this site recently.<p>I have a 2002 V70XC with the same differential - viscous coupling configuration to that you show in the picture you provided.<p>I do not have the fancy blue sway bar though but the differential fill plug is the same.<p>I have just replace the fluid in the rear differential and did have a problem inserting a drain tube. <p>It was necessary to reverse the car onto ramps so that it had a bit of an angle so the oil flowed to the front of the differential where the fill plug is.<p>I needed to use a 1/4 inch diameter clear vinyl hose and squeezed the end flat to insert it straight down into the fill port about 2.5 inches until it hit bottom.<p>Once the tube was inserted it is straight forward to drain the fluid either by using a pump or by suction. <p>In my case I needed to rake the leaves on the lawn so I left it drain by gravity since I was not in a rush.<p>To refill the differential, I left the rear wheels on the ramps but jacked up the front of the car and put it on jack stands, to level the car, so that the correct amount of oil could be added.<p>Refilling was straight forward using a larger 7/16 inch diamter vinyl tube attached to the nozzle on the bottle. <p>Hope this helps.<p> <p>
 
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