I have an 81' Hunter 30 with a Yanmar 2QM15. I recently had a temp and oil pressure guage installed. The temperature guage is generic, and the warning lights are now disabled. Does anyone know at what temperature I should shut down the engine? It is sea water cooled, and normally runs pretty cold, but I would like to know how hot I can let it get in an emergency situation. Thanks
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Not a good Idea!!!!
Fred: I suggest that you reconnect the warning buzzers. I personally do NOT think that this is a good idea on a boat. When I spoke to the Yanmar mechanic he offered this advice. Connect the Oil Pressure and Water Temp. gauges via a tee. That way you will have a visual gauge (as you did) and the buzzer panel too. Unlike an automobile where the panel is alway right in front of your face, these gauges are not there for you to look at all the time. To answer your original question, I do not have the manual so I cannot give you the specs. My guess is that the temp would be in the 180-190 range. I think that these engines operate in the 150-160 range (correct?)
Fred: I suggest that you reconnect the warning buzzers. I personally do NOT think that this is a good idea on a boat. When I spoke to the Yanmar mechanic he offered this advice. Connect the Oil Pressure and Water Temp. gauges via a tee. That way you will have a visual gauge (as you did) and the buzzer panel too. Unlike an automobile where the panel is alway right in front of your face, these gauges are not there for you to look at all the time. To answer your original question, I do not have the manual so I cannot give you the specs. My guess is that the temp would be in the 180-190 range. I think that these engines operate in the 150-160 range (correct?)
J
james rohr
Yanmar Service manual specs
According to the service manual Operating temp of 2QM15 is 52 deg cent. +-2deg =178-184deg. f. Alarm is set at 60 deg. cent. +-2deg. off at 56 +-2deg. The danger of running it too hot in a raw water cooling situation is that if you are in salt water it will precipatate out salts and build up inside your engine. I would say that shut down should occure at close to boiling. I would'nt be afraid to run it for a short time at the high temp. If it gets to boiling you have a real prob in that its not a pressurized system. since Its still alive, if i were you I would be hunting for a fresh water cooling sys. for this eng. I have the same eng in my O'Day 30 and prior to last year it was raw water cooled and it rusted from the inside out. to the point of holes in the head. and the water jacket in the block almost completely blocked with rust build up. the exhaust manifold was almost totally blocked also.THE EXHAUST MANIFOLD IS NO LONGER AVAIL. FROM YANMAR. I was lucky enough to find another engine that had the fresh water cooling sys installed on it when it was new. Good luck.
According to the service manual Operating temp of 2QM15 is 52 deg cent. +-2deg =178-184deg. f. Alarm is set at 60 deg. cent. +-2deg. off at 56 +-2deg. The danger of running it too hot in a raw water cooling situation is that if you are in salt water it will precipatate out salts and build up inside your engine. I would say that shut down should occure at close to boiling. I would'nt be afraid to run it for a short time at the high temp. If it gets to boiling you have a real prob in that its not a pressurized system. since Its still alive, if i were you I would be hunting for a fresh water cooling sys. for this eng. I have the same eng in my O'Day 30 and prior to last year it was raw water cooled and it rusted from the inside out. to the point of holes in the head. and the water jacket in the block almost completely blocked with rust build up. the exhaust manifold was almost totally blocked also.THE EXHAUST MANIFOLD IS NO LONGER AVAIL. FROM YANMAR. I was lucky enough to find another engine that had the fresh water cooling sys installed on it when it was new. Good luck.
S
Scott Blahnik
Glad I had the buzzer!
Even though it is really loud and obnoxious, I got my attention! Probably saved me from burning up! See my " exhaust soot" post. Scott S/V Hello Dolly
Even though it is really loud and obnoxious, I got my attention! Probably saved me from burning up! See my " exhaust soot" post. Scott S/V Hello Dolly
Exactly Scott!
Scott: This is exactly my point. The buzzers are set to go off before the engine has been damaged (oil pressure and water temp). If we do not remember the levels that are critical, what good did that gauge do? NOTHING!
Scott: This is exactly my point. The buzzers are set to go off before the engine has been damaged (oil pressure and water temp). If we do not remember the levels that are critical, what good did that gauge do? NOTHING!
F
Fred
Thanks
Thanks for all the responses. I did not do the install, so I will see if I can get the buzzer reconnected (assuming it has been disconnected). I understand the need for the buzzer, and I did have the guages placed in plain view from the helm position. Does anyone have any guides on how to check the buzzer for temp? I was told that the sending unit for a guage is different than the sending unit for the light and that is why it was disconnected. Anyone know the difinitive truth on this? Thanks again!
Thanks for all the responses. I did not do the install, so I will see if I can get the buzzer reconnected (assuming it has been disconnected). I understand the need for the buzzer, and I did have the guages placed in plain view from the helm position. Does anyone have any guides on how to check the buzzer for temp? I was told that the sending unit for a guage is different than the sending unit for the light and that is why it was disconnected. Anyone know the difinitive truth on this? Thanks again!
They have to match.
Fred: They have to match. If you purchase a Stewart Warner gauge, you probably need a SW sending unit. Contact a local Yanmar shop in your area, they should be able to help you tee off your existing ports in the block. The treads are BPT not SAE so they will need some recutting of the treads so everything will screw in properly. I was told NOT to put the oil pressure tee on the block. Use a hose and run it to something solid. The fitting is too small to support a tee. From the hose you can tee off of that.
Fred: They have to match. If you purchase a Stewart Warner gauge, you probably need a SW sending unit. Contact a local Yanmar shop in your area, they should be able to help you tee off your existing ports in the block. The treads are BPT not SAE so they will need some recutting of the treads so everything will screw in properly. I was told NOT to put the oil pressure tee on the block. Use a hose and run it to something solid. The fitting is too small to support a tee. From the hose you can tee off of that.
J
james rohr
re; threads for sensor
the threads cut in the plate on the back of head where sending unit is screwed into are NPT (national pipe thread) ie.tapered thread.
the threads cut in the plate on the back of head where sending unit is screwed into are NPT (national pipe thread) ie.tapered thread.
That is NOT what I was told.
James: I was told by the Yanmar guy that they where BPT (not tapered). What model engine are you referring to? Mine is a 2GM20F.
James: I was told by the Yanmar guy that they where BPT (not tapered). What model engine are you referring to? Mine is a 2GM20F.
J
Jon petersen
BPT threads for sensor
I Checked with Yanmar before I installed a temp sensor and gauge in the line going to the hot water heater and left the warning light alone.. Because of the different threads.. The new gauge reads fine.. I know because the alarm went off and the gauge read 203.. the same temp that the alarm is set to... on my 33.5, 3GM30F.
I Checked with Yanmar before I installed a temp sensor and gauge in the line going to the hot water heater and left the warning light alone.. Because of the different threads.. The new gauge reads fine.. I know because the alarm went off and the gauge read 203.. the same temp that the alarm is set to... on my 33.5, 3GM30F.
J
james rohr
On the 2GM20 that could be correct
Fred; Your original posting was re; a question on a 1981 hunter w/ a 2QM15 which is a completly different engine. It has a few parts which are common to both engines. but the head is not one of them. which motor do you have?
Fred; Your original posting was re; a question on a 1981 hunter w/ a 2QM15 which is a completly different engine. It has a few parts which are common to both engines. but the head is not one of them. which motor do you have?
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