I think you have an air lock in the system. I had a 35 III a few years ago and it had a stock Yanmar heat exchanger. The hose that came out of the engine just above the water pump and goes to the water heater had brass tee fitting that was fitted to the block and had a bleeder valve installed. The bleeder valve was the high point in the sysem. My current C&C has a 3 cylender Yanmar 3HM with the same bleeder valve set up. The shop manual talks about using this valve to bleed the air out of the system when the antifreeze is changed or the hot water heater is replaced.
Doug Allardyce ~~~_/) _/) ~~~ C&C 41 BULLET From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Matthew via CnC-List Sent: Wednesday, August 26, 2020 10:00 AM To: cnc-list@cnc-list.com Cc: Matthew <wolf...@erie.net> Subject: Re: Stus-List Overheating yanmar 3gm30 What’s the pink good stuff? Around here, pink antifreeze is used for winterizing potable water systems. It is not the good stuff for engines (at least not mine). From: CnC-List <cnc-list-boun...@cnc-list.com <mailto:cnc-list-boun...@cnc-list.com> > On Behalf Of Mazen Aziz via CnC-List Sent: Tuesday, August 25, 2020 10:55 PM To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> Cc: Mazen Aziz <mazen.a...@olympian.org <mailto:mazen.a...@olympian.org> > Subject: Stus-List Overheating yanmar 3gm30 Hi everyone, Hope everyone is doing well and staying safe. So since I got the boat(C&c-3 35) 2 months ago, I have been doing all the typical engine Maintinance. I never touched an <https://www.cruisersforum.com/forums/tags/engine.html> engine before with absolutely no experience. Got the <https://www.cruisersforum.com/forums/tags/boat.html> boat and started to follow the manual from <https://www.cruisersforum.com/forums/tags/oil%20change.html> oil change, filters, impellers etc. However, my <https://www.cruisersforum.com/forums/tags/engine.html> engine now heats up and the idiot temp <https://www.cruisersforum.com/forums/tags/alarm.html> alarm comes off. I have a yanmar 3gm30 that has been modified to be coolant cooled. My engine had unknown green <https://www.cruisersforum.com/forums/tags/coolant.html> coolant, I went ahead and flushed it and replaced it with the pink good stuff. While troubleshooting the overheat, I checked the impellers again(both new), pumps rotate with no problem or leak and sea <https://www.cruisersforum.com/forums/tags/water.html> water ofF the <https://www.cruisersforum.com/forums/tags/exhaust.html> exhaust and no leakage anywhere. So I think it has to be the coolant circuit. Something weird is that the hose from the <https://www.cruisersforum.com/forums/tags/heat%20exchanger.html> heat exchanger to the <https://www.cruisersforum.com/forums/tags/pump.html> pump until the thermostat, stays cold. But from the thermostat to the engine block and the last hose from block to the <https://www.cruisersforum.com/forums/tags/heat%20exchanger.html> heat exchanger is really hot. All hoses are replaced and checked for blockage. Is that an air block? If so, how can I bleed the system? Couldn’t find that anywhere. Also after the engine cools, I opened all the hoses to check if they have flow on them, and they all had coolant except these last 2 from the engine block to the heat exchanger. Is that normal? Should I fill them up manually with coolant to try to get rid of any air blockage? Last but not least, I may have trouble shoot the engine so much, and now I see steam that comes off or close by the 1st cylinder. Also a lot of blue smoke from the <https://www.cruisersforum.com/forums/tags/exhaust.html> exhaust. That never happened before. Did I mess up big time? Thank you again for your time Enterprise C&c-35 San Francisco MAZEN AZIZ <https://mazenaziz.wixsite.com/mazenaziz> https://mazenaziz.wixsite.com/mazenaziz "I don't think that architecture is only about shelter, is only about a very simple enclosure. It should be able to excite you, to calm you, to make you think." Zaha Hadid "It isn't the mountains ahead to climb that wear you out; it's the pebble in your shoe." Muhammad Ali
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