Westerbeke W46 Antifreeze Drain ?

[Saltyhog]

I need to drain/replace the antifreeze in my W46. Does anyone know where the drain is on this engine? I looked through the manuals and they're not much help. From the manual, it looks like there may be a drain plug/bolt below one of the freeze plugs on the block, but the manual isn't too clear about it. Access to that area is not very good, it's behind the fuel injection pump ( I think). I need to do this for a couple of reasons. 1) When I removed the pencil zinc in the heat exchanger, the zinc had broken off inside. I need to remove the heat exchanger to clear the zinc. I figure I'll clean things up while I'm in there. No room to remove caps / core in place. 2) This engine is new to me and I don't know when the antifreeze was last changed. I figure it's a good idea to change it now. Thanks for any help.
-Tom

[Blue Stocking]

Core is not removable from jacket on my W46. You need about 1" to remove end caps bolt. I put doubled zip-lock bag over end to trap liquid. and manipulate slackened bolt by sight thru bags.
Good luck.

[Saltyhog]

How difficult is it to remove the entire heat exchanger from the engine? It looks to me that there are just 4 hoses and 2 bolts, and the whole thing comes off. I wasn't very clear in my original post. I plan to remove the heat exchanger, and then clean out the old zinc pieces and then clear out the tubes. I've seen recommendations to run a wire/welding rod through the tubes to clean the crud and scale. I can't replace the zinc because the hole is blocked inside the exchanger with the old zinc. I'm still puzzled as to how to drain the coolant from the block.
-Tom

[Blue Stocking]

2 bolts and 4 hoses is correct. When you re-install, connect all 4 hoses before tightening bolts. The short hose to the heater take-off can be a real pain in the neck if the h/exch is already bolted down.
Drain coolant thru heater hose.