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Honda bf20 water leaking through the flushing port

M

mrhc0ckey7

New member
Hi, I am haivng an issue where some water is flowing out of the hole above the thermostat that is built for flushing the motor without turning it on. I am not sure how to fix this. Any help would be appreciated.
Thanks,
Tim
 
Two options, either blank it off with an 8mm X 12mm bolt with an O ring on it or remove the whole water jacket and inspect the check valve, it may just need cleaning but could also have a corroded seat (if used in saltwater)
 
Hi, thanks for the quick reply. Is this something that I should be concerned with or not really. Also is it very hard to remove the water jacket cause I would like to fix it due to the fact that the engine has never been used in saltwater.
thanks
tim
 
On my 130 this is easy. Pull the two bolts the clean the check valve. If it’s only a little water, not too much worry. But that’s water and pressure that is supposed to be flowing into the head. I’d be concerned if that was in salt water. Need all the water pressure you can to keep those passages clear.
 
If you never want to use the flushing port and the engine has not seen significant salt water use then putting a screw with o-ring in the hole will be fine. If you plan to flush then you will need to take off the water jacket cover and clean out everything. There is a plastic part and a spring that prevents water from leaking from the hole. Mine were frozen with salt buildup and after cleaning they were still fine to reuse. I used CLR since it is supposed to be safe around aluminum. There is also an anode under there.

I just went through this on my 2004 20hp motor which I bought about a year ago. It lives in salt water so I am glad I did this. The thermostat was frozen 1/2 way open and the anode was completely gone. You will need to buy gaskets and clean the sealing surfaces thoroughly. I also rented a thread chaser/restorer kit from Autozone (they refund the money if you return the tool within 3 months) and bought some new screws since mine were corroded. It is not that difficult if you have decent tools. I had a lot of salt buildup inside. I don't think anyone ever opened this since 2004.

Even with fresh water use, you might want to remove and inspect the thermostat. There is a separate cover with 2 screws to remove the thermostat only. You can test it by heating it in a pan of water along with a thermometer. You'll want to get a new gasket. The thermostats are a bit pricey, so if it looks and tests OK you can reuse it. Removing the thermostat cover is easy if the bolts are not corroded. There are a number of things to remove to get to the water jacket cover, but overall it was not that difficult.

Unfortunately I can't find a parts diagram on this site. Here is one from another site: https://peparts.honda.com/marine#/browse/oe/bf/bf20/BF20D4-SRTA


Good luck,
Barry
 
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