Good evening everyone,
Question here regarding the MS small drive unit.
So in reviewing the service manual for the MS(2016), it specifies a very specific fill procedure for the rear, small motor DU that instructs to NOT fill the rear DU thru the upper fill plug, but to instead go thru all the trouble of removing the axle shaft and filling the DU thru the axle shaft hole, being careful to only refill with the proper amount of oil.
So my assumption was that the fill plug was not at the correct height for a proper fill, and removing the axle was the only way to overcome this engineering oversight. However, I did just perform a service on the rear DU and made a few observations.
First, the upper fill plug bore does open up into the DU housing, as I put some oil into the diff with it coming out of the bottom drain plug. However, there is an internal part of the DU(unidentifiable/maybe oil pump?) that prevents inserting a fill hose anymore than a 1/2“ or so, but this part does not prevent oil from filling the DU.
Second, I performed a measured fill-(2,250ml) thru the upper fill plug despite what the Tesla service procedure states. I ran out of oil from my container just as the oil level came up to the bottom of the fill plug bore.
It appears that the upper fill plug IS in the proper location despite what the Tesla service procedure would have you believe. So my question is does anyone know why Tesla would instruct to remove the axle to fill when it looks like it’s completely unnecessary?
Question here regarding the MS small drive unit.
So in reviewing the service manual for the MS(2016), it specifies a very specific fill procedure for the rear, small motor DU that instructs to NOT fill the rear DU thru the upper fill plug, but to instead go thru all the trouble of removing the axle shaft and filling the DU thru the axle shaft hole, being careful to only refill with the proper amount of oil.
So my assumption was that the fill plug was not at the correct height for a proper fill, and removing the axle was the only way to overcome this engineering oversight. However, I did just perform a service on the rear DU and made a few observations.
First, the upper fill plug bore does open up into the DU housing, as I put some oil into the diff with it coming out of the bottom drain plug. However, there is an internal part of the DU(unidentifiable/maybe oil pump?) that prevents inserting a fill hose anymore than a 1/2“ or so, but this part does not prevent oil from filling the DU.
Second, I performed a measured fill-(2,250ml) thru the upper fill plug despite what the Tesla service procedure states. I ran out of oil from my container just as the oil level came up to the bottom of the fill plug bore.
It appears that the upper fill plug IS in the proper location despite what the Tesla service procedure would have you believe. So my question is does anyone know why Tesla would instruct to remove the axle to fill when it looks like it’s completely unnecessary?