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Author Topic:   Hot Water
Eddie Mucciolo posted 02-01-2004 11:51 AM ET (US)   Profile for Eddie Mucciolo   Send Email to Eddie Mucciolo  
My 2002 carburetor 150 Mercury Saltwater-Seris engine water pump indicator pumps some very hot water after warm up. The helm quicksilver gauge shows normal. I had replaced a 1998 115-HP 2-stroke and it also ran hot water from the indicator, just not as hot. All of the engines I have owned prior to this have been Johnsons or Evinrudes and the pump indicator ran cooler water. I am told Mercurys run hotter. Is this true.It sure does run good.
jimh posted 02-01-2004 03:50 PM ET (US)     Profile for jimh  Send Email to jimh     
The difference in the temperature of the water being exhausted from the confidence stream outlet that you have noted between engines from OMC and engines from Mercury may be explained as follows:

On Mercury engines the confidence stream outlet is supplied with water that has circulated through the water jacket of the engine and thus may be heated.

On OMC engines the confidence stream outlet may be getting water directly from the water pump, prior to circulation through the water jacket of the engine and thus is more likely at lake or sea temperature.


Gene in NC posted 02-11-2004 08:10 PM ET (US)     Profile for Gene in NC  Send Email to Gene in NC     
Jimh may be right gain. My '86 OMC 90 service manual does not show the telltale as part of the cooling system flow.

If true, how does the flushing attachment (w/o muffs) as sold on this board do any worthwhile flushing of the block. For that matter aparently there is no worthwhile flush with muffs until the thermostats open.

lhg posted 02-21-2004 11:05 PM ET (US)     Profile for lhg    
As JimH stated, the Mercury V-6 telltales go all the way through the engine before exiting (which I think is an excellent design idea) and are extremely hot, almost enough to scald your hand. This is normal. That's why they continue to run several minutes after shutdown as they drain down. And accordingly, when the engine is started, they take about 2 minutes to first show up.
Eddie Mucciolo posted 02-22-2004 10:22 AM ET (US)     Profile for Eddie Mucciolo  Send Email to Eddie Mucciolo     
Thank you! I always checked the tempature with the pump indicator stream while I ran the motor with ears when I don't use the boat for more than a week. The tempature gauge also works well with this engine and will be used from now on. All motors should be plumbed this way. Besides the 60 mercury I had on my 15 this motor is the best I have owned.

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