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Old 28-05-2019, 04:14   #1
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Yanmar 3YM30AE Raw water overflow/pressure relief valve?

Greetings,
I replaced my trusty 2gm20f for more umph! Hope it wasnít a mistake.
First try, it started straight away and itís purring like a kitten HOWEVER there is a constant and pressurized sea water coming out of the clear hose from the back of the heat exchanger. This turns to a trickle when the motor is switched off and of course stops when the through hull valve for the raw water is turned off. Iím hoping for an advise and a path to solution from the gurus of thisís very useful forum.

Mark
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Old 28-05-2019, 04:22   #2
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Re: Yanmar 3YM30AE Raw water overflow/pressure relief valve?

Even though Iím a useless armchair guru who didnít know where the Pythagorean chandelery was, Iíll still take a stab at this.

Is this a winterizing drain with a petcock on it? There should be no ďpressure relief valveĒ on the raw water side.
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Old 28-05-2019, 04:26   #3
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Re: Yanmar 3YM30AE Raw water overflow/pressure relief valve?

In fact, after consulting the manual, it is a drain cock.

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Old 28-05-2019, 21:43   #4
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Re: Yanmar 3YM30AE Raw water overflow/pressure relief valve?

My dear armchair guru,
I see I must have offended you and I apologies. I was simply trying to target my question to sailors in certain cruising area. Not knowing where/what Pythagorean is certainly not important.
A petcock nut/bolt head and/or a valve at the end the running hose certainly would be the first thing to tighten/shut off to solve this problem. However, this sucker has no such thing on the raw water side. It has one on the fresh water coolant side. but this is another gripe I have with this brand new engine. It could certainly be a good topic for rants and raves on ďnew generation of Yanmar enginesĒ not to mention missing alternator cable from the starter. 😁😁😁
By the way mine turned out to be the Sea water drain cock. It was wrapped with masking tape and the hose barb it self is a petcock!!!!
Thank you very much for your note and please accept my sincere apologies.

Norna
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