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Engine stops pissing

K

Kinobay

New member
Bought a used boat with only 100 hours on a 9 year old boat, bad mistake but I did it. Before you jump, I had the boat surveyed and the surveyor said the engines were perfect. The boat has twin Honda 130's. It has been setting up for the last year so I changed everything that I though was necessary, plugs, thermostats, impellers, engine oil, outdrive oil, etc. Maiden voyage the port engine stops pissing and high temp alarm goes off, shut the engine down and restart it after it cools down and limp back home. Get it back to the stall and clean out the pisser several times but it keeps clogging up. It appears to be corrosion from the inside of the engine not trash from the water. Now the starboard is showing the same signs. Is there anything you can run thru them to clean it out? I have used salt away and a diluted vinegar and soap mixture and it helps some but it will piss for awhile and then clog up again, help!
 
If your overheat alarm went off, it's not just the telltale that is clogged. It may be very likely that your water pump impeller dried out, and pieces broke off and are clogging the water passages. Not that familiar with the 130, but I would remove the T-stats and back flush the water passages using a water hose with as much pressure as you can get. Typically I use a nozzle fully open, tightly wrap a rag around it, seal it into the t-stat opening by hand pressure, and turn the water on full force. I would also remove the hose to the telltale outlet, make sure that is clear, and then closely inspect and clean out as best as possible where that hose connects to the water jacket - debries typically collect there. The bottom line is that you need to back flush the whole water system and re-treat with salt away.


 
Howdy,
You could make a whole new world out of what I don't know but it just doesn't seem feasible to me that you could get that much corrosion from 100 hr. engines, even if they weren't flushed. You said that you did the thermostats. Did it look that gawd awful bad when you were in there?

A couple of other places to look, if you haven't already, would be the cylinder block water jacket cover, item #6 on the page link below. Item three is the sacrificial element and should be periodically replaced anyway along with the water jacket pressure valve (17) and spring (18).

http://www.boats.net/parts/search/H...001 TO BZBH-1299999/CYLINDER BLOCK/parts.html

Additionally, look at the cylinder head flush valve assembly (item #9 on the linked page below) and ensure that all is ok there. Make sure your problem isn't with the relief valve (item 10) opening and discharging a large part of your cooling water out the drain tube.

I'm not familiar with the operation of this particular engine but it appears that this system is intended to be pressurized by the water jacket pressure valve and protected from over pressurization from this relief valve. All these things need to work in conjunction with each other to get proper heat transfer and cooling. Also, these areas provide excellent access points to do what chawk_man suggested about flushing everything out.


http://www.boats.net/parts/search/H...O BZBH-1299999/CYLINDER HEAD COVER/parts.html

HTHY
jimmyd
 
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