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Old 15-01-2012, 13:49   #31
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Re: Yanmar 3GM30 - how much smoke is OK?

OK, I understand the vacuum reducing the boiling temperature - but in my engine's case, the water pump">raw water pump is before the engine, so the hose under vacuum/suction - from the seacock through the strainer to the inlet of the raw water pump is not at elevated temperature at all - i.e. before the engine.

The raw water enters the engine on the OUTLET side of the raw water pump - so presumably the hot bits will never be under vacuum.

Or am I misunderstanding something?

On installing a temp gauge, I would love to, but where does the sender go?

I will run the engine again tomorrow to charge and will measure the temperatures again and report back!

Thank you very much again!
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Old 15-01-2012, 14:09   #32
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Re: Yanmar 3GM30 - how much smoke is OK?

Quote:
Originally Posted by akio.kanemoto View Post
OK, I understand the vacuum reducing the boiling temperature - but in my engine's case, the raw water pump is before the engine, so the hose under vacuum/suction - from the seacock through the strainer to the inlet of the raw water pump is not at elevated temperature at all - i.e. before the engine.

The raw water enters the engine on the OUTLET side of the raw water pump - so presumably the hot bits will never be under vacuum.

Or am I misunderstanding something?

On installing a temp gauge, I would love to, but where does the sender go?

I will run the engine again tomorrow to charge and will measure the temperatures again and report back!

Thank you very much again!
There should be a pipe plug somewhere around the thermostat, hopefully before the T-stat. That's where to install the sender. Or you may have to T into the sender for the idiot light. Mechanical gauges will have a long sender probe so calculate for that, if applicable.

I only mentioned suction b/c of flow restrictions. I don't know how the 3GM's (raw water) are set up.
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