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Last weekend I was going to replace antifreeze in my Yanmar 4JH2E but
couldn't find drain plug. I am afraid it is somhere not accessable. Went through manual but in the chapter about servicing cooling system it was not explained how to drain the old antifreeze.
Any suggestions will be greatly appreciated.
Nestor Tolstikhin
Bayfield 36' Miracles
Suggest when re-filling you let it run a bit with the expansion tank cap off until it won't take any more coolant. Some engines may have an air bleed screw high up on the block, don't know about Yanmars?

Paul T
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