I recently bought a J-Boats J35 which came with the original Yanmar 3YM30 and a freshwater heat exchanger. I have 2 questions:
1. The console (where you put the key in etc.) has a 3-position electrical toggle switch. When flipped up, the "C.W.Temp" light immediately comes on. The middle position does nothing (with the light off). When flipped down it also doesn't seem to do anything. I crawled behind the console and I can see wires connected to all terminals, but I cannot figure out where they go to. I tried flipping the switch in all positions to hear for noise of a relay and I don't hear anything. I assume that C.W.Temp is Coolant Water Temp and having the light on is a bad thing. I have been running the engine/boat with the switch in the middle position and everything seems fine, but I would like to know what this switch does and why it is there...
2. Can someone give me a definitive answer on whether this engine has a built-in glow-plug or other pre-heat device? In the Seattle winter weather (40's F) the engine is VERY hard to start and I was concerned about burning out the starter and/or damaging the batteries. It would also send a good amount of raw diesel into the water via the exhaust, which I am not happy about. Once it runs for a bit and warms up, it fires right up with barely a chirp of the starter. I have since read various techniques for starting diesels of this class ranging with everything from pouring boiling water on them, to pointing space heaters at them, also apparently there is a method to start which involves flipping a decompression lever before turning the engine over (I guess to let warmer air in), also people seem to use starting fluid. I rigged up a hair dryer in my engine bay which after running for ~10min makes a big difference for me... That said, is there a glow-plug on this thing that I am not seeing? Is it possible to add glow plugs? I own two newer diesel cars and never had starting problems. Would be nice if my boat started without fuss or needing 110 shore power.
1. The console (where you put the key in etc.) has a 3-position electrical toggle switch. When flipped up, the "C.W.Temp" light immediately comes on. The middle position does nothing (with the light off). When flipped down it also doesn't seem to do anything. I crawled behind the console and I can see wires connected to all terminals, but I cannot figure out where they go to. I tried flipping the switch in all positions to hear for noise of a relay and I don't hear anything. I assume that C.W.Temp is Coolant Water Temp and having the light on is a bad thing. I have been running the engine/boat with the switch in the middle position and everything seems fine, but I would like to know what this switch does and why it is there...
2. Can someone give me a definitive answer on whether this engine has a built-in glow-plug or other pre-heat device? In the Seattle winter weather (40's F) the engine is VERY hard to start and I was concerned about burning out the starter and/or damaging the batteries. It would also send a good amount of raw diesel into the water via the exhaust, which I am not happy about. Once it runs for a bit and warms up, it fires right up with barely a chirp of the starter. I have since read various techniques for starting diesels of this class ranging with everything from pouring boiling water on them, to pointing space heaters at them, also apparently there is a method to start which involves flipping a decompression lever before turning the engine over (I guess to let warmer air in), also people seem to use starting fluid. I rigged up a hair dryer in my engine bay which after running for ~10min makes a big difference for me... That said, is there a glow-plug on this thing that I am not seeing? Is it possible to add glow plugs? I own two newer diesel cars and never had starting problems. Would be nice if my boat started without fuss or needing 110 shore power.