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Old 06-07-2010, 12:53 PM
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Default Outboard Water Jacket Cleaning

I have a 1995 Yamaha Pro-V 175 that I have recently installed on a new Trans SVT cat hull. I took the motor off of my old Gulfcoast hull and the motor performed flawlessly for 3 years on that hull. On the shakedown cruise everything was fine until about 10 minutes into the cruise.The motor's temp. alarm would go off any time I tried to get on plane. I tried both a 4 blade and 3 blade prop and with and without the after market cav. plate (shallow blaster knockoff). After talking to the boat dealership I changed out the thermostats on the motor and noticed a significant buildup of gunk in the water jacket system and I suspect this is the source of my problem.

Does anybody know of a good flush (other than Salt -Away which I have already tried)that I can use to clear the cooling system on the motor? Or anything else I can try, poppet valves, water pump?

Any input would be greatly appreciated.

Thanks

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Old 06-07-2010, 01:36 PM
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Some diesel guys use this stuff: http://www.rydlyme.com/home.html

Mastry engine (Yanmar/Mercury) sells it here in tampa bay.
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Old 06-07-2010, 02:13 PM
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Quote:
Originally Posted by CapnPerk View Post
I have a 1995 Yamaha Pro-V 175 that I have recently installed on a new Trans SVT cat hull. I took the motor off of my old Gulfcoast hull and the motor performed flawlessly for 3 years on that hull. On the shakedown cruise everything was fine until about 10 minutes into the cruise.The motor's temp. alarm would go off any time I tried to get on plane. I tried both a 4 blade and 3 blade prop and with and without the after market cav. plate (shallow blaster knockoff). After talking to the boat dealership I changed out the thermostats on the motor and noticed a significant buildup of gunk in the water jacket system and I suspect this is the source of my problem.

Does anybody know of a good flush (other than Salt -Away which I have already tried)that I can use to clear the cooling system on the motor? Or anything else I can try, poppet valves, water pump?

Any input would be greatly appreciated.

Thanks

CapnPerk
If it happens that quickly I'd bet it's not scaly water jackets and certainly not just because you changed hulls. Are you getting a steady pee stream? I'd bet not on plane. A water pressure gauge would help too.
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Old 06-07-2010, 03:04 PM
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poppet valve
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Old 06-07-2010, 04:01 PM
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Go through everything but while you have it apart do this.
Take the lower unit off and place a clean bucket under the mid section. Remove the thermostats. Take a hose and backflush the cooling system through the open t-stats housing and see what ends up in the bucket. Run some vinigar through and let it sit awhile as well to help clean up the scale. Flush again. It should all end up in the bucket.
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Old 06-10-2010, 04:58 AM
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I occasionally have that problem with my 200 hp 2002 Bombadier. I don't know if Yamaha technology for cooling is similar. In my case, the powerpack gets hot to the touch. I trace the hose from the top of this down to the vapor separator, disconnect it there, discover the crud in the intake tube, poke it out, and am good to go again. (You can tell when the job is successful, if you can now run your thumb along the top of the powerpack while motor is running and not feel any significant heat. Good luck!
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