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ccarlson

Yamaha HPDI question

11 posts in this topic

I've got a 2003 Yamaha 225 HPDI. There is a water line on the left side of the motor with a garden hose size connector. I believe this is a connection to flush the system when used in salt water but not sure.

Anyway, instead of using muffs when running the motor in the driveway, can I just hook up the garden hose to this line and will it adequately circulate the water to cool the engine? The motor has a high speed water pick up at the front of the bullet and the muffs just don't fit that well so this would be a great option.

when I turn on the water, it does send water out the exhaust area as well as the p hole so I'm assuming its ok to run it this way. Just would like to confirm with someone who knows for sure. I got the motor used and do not have a manual.

thanks,

ccarlson

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I am no expert, but I think that is a no no. When you hook up that line it uses gravity to feed down through the system. With the boat running, it will be forcing the water up, not letting any of the water get to the impeller.......I think?

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NO!! do not run the engine with the intigral flushing adapter, it is designed to flush the motor only.

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hmm, that's news to me, i've always run mine in idle with the hose connected to it.

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From Yamahas HSOforum....

Yamaha Outboard FAQs

Category

--Select-- Dealers Ethanol Topics General Model Year Elimination Operation Parts & Accessories Products Service & Maintenance Warranty

Question

May I run the engine while using the integral Freshwater Flush adapter on my engine?

Answer

No. The convenient integral Freshwater Flush adapter has been designed for flushing of critical components without running the engine. The Freshwater Flush adapter was not designed to provide adequate cooling water, so the engine can be damaged from overheating. See "May I start the engine out of water?" for more information.

Yamaha Outboard FAQs

Category

--Select-- Dealers Ethanol Topics General Model Year Elimination Operation Parts & Accessories Products Service & Maintenance Warranty

Question

May I start the engine out of water?

Answer

Never start your engine out of water unless you are using an external lower-unit flushing adapter, commonly known as “ear muffs” designed for your type of outboard motor (not the integral Freshwater Flush Adapter found on some engines) to provide cooling water from a garden hose. Otherwise, you could damage or seize the engine. Operate at no more than an advanced idle with good water pressure. Never put the engine in gear; only use the warm-up lever to advance the throttle. Never leave an engine running on a flush attachment unattended.

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Do NOT run the motor while connected to this flushing port. As stated above, it's only to flush the motor, not to run it on.

marine_man

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Yes. Thats true for Mercury's as well... If its the integral flushing connecter designed to flush the cooling system, such as in salt water use or to simply flush out the cooling system, DO NOT RUN ENGINE WITH OUT SUPPLYING WATER TO THE IMPELLER IN THE LOWER UNIT.

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Thanks, my father-in-law has been doing it since his was new. I better call him before he takes it out of storage.

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Thanks for the info guys. Good to know.

ccarlson

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I did not know that. I have seen people run them like that. I will let them know. Thanks.

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