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Re: OVERHEATED DIFFERENTIAL DUE TO LACK OF OIL
Yes you do use the end of a ratchet or breaker bar,and they are generally pretty tight anyway,use a peice of pipe to extend you ratchet or breaker bar,standard thread so it will loosen to the left,once you're all set up trying giving it a few quick pops rather to loosen rather than constant torque.Fill with gear lube to the bottom of the filler hole.But you should keep your eyes open for what may have caused the oil level to drop to begin with.
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remove the rear cover all the bolts except the top 1 just loosen that 1. Put a bucket under the rear diff and open the diff cover and drain out the fluid. clean and reseal the diff. remove the plug on the front of the diff and fill with the correct diff fluid until it is filled up to the hole and replace the plug, clean up and check for leaks. No leake = job is complete.
You don't say what type of car you have and what mileage it has run so far.
Most likely the whine is from a very worn pinion gear.
Other than replacing or rebuilding the diff there is nothing you can do other than drain the old diff oil and replace it with new oil. ONLY use the manufacturer specified differential oil in the correct grade. This may quieten the noise a little but any difference will be minimal. It may help extend the life of the worn diff a little and it will get rid of any debris suspended in the old diff oil..
The diff drain plugs are often magnetic to pick up metal to prevent it being recirculated so check if there is much in the way of metal filings on the drain plug when it is removed.
Without disassembling the diff no one can tell you how long it may last but they are expensive to replace so I would be replacing the vehicle sooner rather than later if you don't want to replace the diff.
Until you sell the car, drive it gently when moving off from a stop and when accelerating to minimise stress on the diff.
If you are going to replace the diff oil yourself the car will need to be level and ensure you loosen and remove the diff oil filler plug before you remove the oil drain plug. If you drain the oil and the filler plug is stuck you will be in trouble. It will be a lot easier to just buy the correct diff oil and take the car to a reliable mechanic to drain and refill the diff for you while the car is up on a lift/hoist.
time to pull the diff centre as the noise is from incorrect positioning of the crown wheel and pinion. This happens from failed pinion bearings or side carrier bearings.. Could be lack of oil or the wrong oil if it is a limited slip diff.
did the diff drain plug come out with a long sleeve on it? if it did it should have a small allen key screw in the middle which needs to be removed and replace the rest and fill fluid through the bottom until it flows out. then replace small allen bolt
There is a drain plug on some vehicles at the bottom side of the differential that must be removed to drain the old oil out but on others you must remove the cover which has at least ten bolts that are in a circle pattern around the differential cover. After removing the cover and draining the old oil out dry out the excess oil left inside the casing with a clean rag, scrape off any old gasket material on both the differential casing and the cover. Purchase a gasket for the cover and reinstall the cover tightening the bolts in a criss cross or X pattern not too tight . Proceed to locate the filler plug on the upper right or left side of the differential, this plug is usually removed with the square end of a 3/8" socket wrench just using the square end of the socket wrench should do it or you may need a large hex head allen wrench but usually using a short extention with the socket wrench to get the clearance to turn the square end of the extention or socket wrench inside the plug will work, some times the plug is very tight and you may need to use a 1/2' drive socket wrench with a 1/2" to 3/8" reducer or adapter to acheive the neccessary torque required to crack the filler plug free, now get a coulple of 80/90 weight gear oil quarts and cut the filler tip back a bit with a razor or utility knife and using a 3/8" length of rubber hose slide it over the end of the tip tighten a small hose clamp on to the hose to prevent it from sliding off the filler tip, then feed the end of the hose into the filler hole on the differential and invert and sqeeze the container of oil to force the oil into the differential until it fills and over flows out the filler hole, screw in the filler plug and tighten. Use this general procedure for both the front and back differentials.
Apply sealant to thread of level / filler plug, and then tighten it to specified torque. A: Sealant 99000-31260SUZUKI Bond No.1217G Tightening torque Differential oil level / filler plug b: 23 Nm (2.3 kg-m, 17.0 ft. lbs.)
On the drivers side of the differential, towards the front, there will be a 1" circle, with a sunk in square spot in the center. This is where you put oil in. Use a 3/8" drive socket wrench to unscrew it. (it fits right in the square sunk in spot) WATCH THE KNUCKLES! It hurts if you bang them, trying to loosen the plug. LOL When you get the plug off, stick your finger in the hole, and see if your finger comes out with any oil on it. The oil needs to be filled to the bottom of that hole. When the oil starts coming out of the hole, then you screw the plug back in, and you are done. IF, the rear diff has plenty of oil in it, then you may have another problem, like (inner/outer) bearings.