Originally Posted by TUFTY
I am going to get some "cheap" transmission oil and fill the gear case then run the engine again and see if water gets in.
Should both the top and bottom screw plugs have fibre washers ?
I found the lower one has a fibre washer but the upper one has a copper washer and O ring.
Is this correct?
Either works, as long as done up right. It's supposed to be a fibre washer on both plugs though,so it's a small possibility if the copper washer had been reused that your leak was round it.Unlikely though in the quantities you described,and there'd probably be no clear water in there.
Replace the fibre washers every time you change the gear oil.
If I were to hazard a guess, I'd say it was probably the propshaft seal gone.
You'll need to run it up on muffs with the 'cheap' oil in first then drain it to get rid of the remains of the emulsified crap first (There WILL be some in there still)or you won't be able to tell. It also means if you've got clear water or really bad emulsification in there after running on muffs it's the driveshaft seal that's had it.
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