You need to have an engine mounted raw water pump
Check the number of teeth on the flywheel
You will need to use the Volvo Bell housing most likely
.... and the Volvo starter
Then there is the cooling system issue... Mercs usually have Raw water cooling systems while Volvos usually have a...
This forum is not limited to Vovlo sterndrives and engines by rules, but rather by the expertise of those who frequent it.
Mistype above and edit times out.... Borg Warner makes Velvet Drives... sorry
Several options...
Given this is a local to you designed boat, first see if matches any local made transmissions.
otherwise.... Velvetdrive is one of the more popular manufacturers of inboard transmissions as is Borg Warner
Is the manufacturer of your boat still in business??? IFSO, try them.
This forum is limited to discussions and advice on Volvo sterndrives. Per your photo, you do not have a Volvo
sterndrive. You have a Volvo 4 cylinder connected to a non Volvo manufactured inboard transmission. There are a number
of manufacturers that it could be. That said, find the...
BB70 is an engine designation. That engine was fitted with any number of transmissions if installed as an inboard, or with an Aquamatic series
sterndrive... Picture please.
The other possibility is that of rusted out or popped "freeze out" plug... ( actually used during manufacture to clear out the core casting sand).
If rusted out, likely the only problem.... if popped out, you may have freeze damage. As I recall... (its been a long time) ... these are on...
I just re read you post... WHICH drain plug... the hull drain or the drive's oil drain?. If the first, you got problems, if the hole near the oil drain, then just plug it and try again.