|
Dear mgcarma,
Hope you're well. Before trying to fill the diff through the speed sensor opening, saturate the differential fill plug with PB Blaster. This is a very effective penetrating oil. It should be available at Auto parts stores in North America. If it is not to be had, get a quality penetrating oil.
Saturate the plug daily, for several days. As the plug's threads are very fine, it will take a few days for the oil to work its way through micro-channels in the corrosion. The oil weakens the corrosion bond.
To remove the plug, use a Stillson-type pipe wrench. This wrench is widely-used by plumbers. It has a movable top jaw, that is moved by turning a knurled, internally-threaded ring. As you turn the ring, its threads engage teeth on the jaw, causing the jaw to open or to close relative to a fixed-position anvil, at the top of the wrench handle.
The sharp teeth on a Stillson-type wrench will bite into the bronze. As you turn the wrench, the grip tightens. I'd guess that a 14" Stillson-type wrench will let you exert enough leverage.
A replacement fill plug is Volvo #30713275. The cost should be about $2. There is also a gasket needed. That is Part #11998; the cost should be about $1. Please check with a Volvo dealer, to be sure these part numbers are valid, before submitting an order.
Once you have loosened the fill plug, ascertain that the bottom-most bolt in the differential cover - at the 6 o'clock position, on the cover's perimeter - will come loose. Through this bolt's hole, the diff oil can drain.
I'd use Mobil 1 synthetic 75W90 gear oil. It should take about 1.45 liters (1.5 quarts) to fill the diff.
Hope this helps.
Yours faithfully,
Spook
|
