Whilst most responsible Mercedes homeowners remember to adjust their motor oil reasonably routinely, not everybody remembers to search soon after the other lubricants on the auto. This write-up focuses on arguably the most severely neglected fluid: the gear oil in the rear differential.
Most Mercedes 126 cars have “open up” differentials, although a couple of the later on designs came with confined-slip differentials. The former do not need a great deal interest and are, in reality, particularly sturdy. Sizzling-rodders have discovered that the rear differential on the 380SE can manage as a great deal as 800hp as a result of the rear wheels. But, that does not imply we can forget about about it fully. The gear oil should be modified at approximately a hundred,000-mile intervals, or every single fifty,000 in extreme provider. If still left in much too very long, it will at some point drop its ability to lubricate and begins to resemble frothy pea soup! (It does not scent much too very good, possibly!)
Fluid potential is only about one.five quarts, so there's no excuse not to use the “very good things.” Amsoil, Redline, and Royal Purple all make superior-high quality synthetic gear oils, normally with 75W-90 viscosity. Just as with an oil adjust, this is most effective accomplished with the fluid at working temperature. The two plugs in the differential – higher fill and reduce drain – choose a 14mm hex crucial and are usually particularly challenging to budge. A very long breaker bar will be necessary. Make absolutely sure that you loosen the filler plug first, simply because if you eliminate the drain plug and then find the filler is trapped, you've obtained a bit of a issue. Melting an ice dice in the filler plug's 14mm-fitting might assist loosen it as a result of thermal contracting.
Refilling is a great deal simpler with a tiny oil pump. Simply just fill till the gear oil is stage with the filler gap when it begins to see out of the threads you know you're accomplished. To guarantee an accurate fill, the auto should be stage in the course of this operation, although this is not vital. If you depart the rear of the auto up on jack stands, a slight overfill will ensue. Torque the plugs to 50Nm (37 lbs / ft).
Source by Richard M Foster