Originally Posted by jwalker
You need to screw the rubber part out of the block. Its a bit tricky without removing other parts, but it can be done providing it too is not seized into the aluminium. Be sure to lubricate the threads with water resistant grease on reassembly.
Parts diagram & the pic of the part shows a nut at each end of the mount instead of a thread cut in the driveshaft housing for it to screw into.
Is it the case that its actually a captive nut inside the housing - the unbroken end - & the square portion at the bottom of the thread on the mount is free to turn & not locked in to a similar shaped hole which would prevent turning? If it's not a captive nut then it either won't come off once it's loose enough to turn or it will fall off inside the housing & - assuming it isn't accessible without taking a lot of other stuff off -then how do you get it onto the new mount?
As I said earlier, my experience of this type of mount is that the nuts are not captive & the square part fits into a square hole - visible on his pics of the broken one - which prevents the mount turning as it's being done up.
I'm guessing that you might have done this on one of these engines & if that's the case I stand to be corrected!