Cornish Crab
New Member
Does anyone know if there are coolant valves or is there only one coolant drain plug on a pipe from the heat exchange on this type of engine ... 2YM15?
Coolant change on a Yanmar 2ym15
- Thread starter Cornish Crab
- Start date
TheBomber
Active Member
I would recommend searching for the service manual for your engine. All will be confirmed in there. Usually easy enough to find a pdf for download.
My 3ym30 has two coolant drains - one obvious one in the pipework leading to the heat exchanger and one more hidden on the side of the engine below the air filter. IIRC that second one also has a short section of clear plastic pipe on it to allow easy draining into the tray beneath the engine.
My 3ym30 has two coolant drains - one obvious one in the pipework leading to the heat exchanger and one more hidden on the side of the engine below the air filter. IIRC that second one also has a short section of clear plastic pipe on it to allow easy draining into the tray beneath the engine.
Cornish Crab
New Member
Thanks for that. I'll check out the service manual. Does your engine have valves .. I suppose these help with the flow when draining?
VicS
Well-Known Member
Cornish Crab
New Member
I've got that same diagram but I had heard that some engines have coolant valves on the engine block. Looks to me that all I have to do is open the filler cap and open drain plug C. I've downloaded the service manual that Bomber suggested but haven't had a chance to look through it yet. Thanks for your help!
TheBomber
Active Member
I didn’t know anything about valves and the 3ym30 service manual only refers to opening the drains to empty the system. Nothing more complex. Hope it goes well
Cornish Crab
New Member
Yeah thanks. I'll let you know how it goes!
VicS
Well-Known Member
The owners manual I have saved refers to 4 drain cocks/plugs, 2 for each coolant and seawater.
These two diagrams show the positions of the additional ones
