Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Re: draining the engine coolant - blocked!
Realize that the Beta Marine engines are "marinized" Kubota diesels. I have a Universal M25, which is also a "marinized" Kubota diesel. After looking at you pictures, it appears that part of the Beta marinization includes installing a 90º Ell, and a petcock (with a plastic valve!) on the Kubota drain hole. I suspect that the 90º ell may be blocked, or the plastic valve may be broken.
I would simply disconnect a coolant hose that connects to the block at a low point to drain the coolant every two or three years.
If you want to fix, then I would start by removing the paint from the Ell, and the petcock, and first try to back out the petcock with a wrench. Once that is out, you can probably clean the Ell. If not, it appears that you may gain enough clearance by removing the petcock, to back out the ell with out bumping into that motor mount.
Find the manuals on the Kubota block that your Beta is based on, and use that as a guide.
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USCG Licensed OUPV Captain, ASA 101/103/104/105/106/118 Instructor - Also certified in Marine Electrical Systems
Last edited by eherlihy; 08-16-2012 at 10:23 AM.