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Catalina/Capri 25/250 Sailor's Forums

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Flush Kit for 15hp Honda

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Justin
Admiral

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502 Posts

Initially Posted - 08/07/2006 : 09:23:28

Using this tech tip from Douglas Young http://www.catalina-capri-25s.org/tech/tech25/tt028.asp I created a flush kit for my Honda BF15A outboard. The engine is different from the one he has in his article. I shopped around for all the same parts that he described to be bought, but had a hard time finding the same ones.
I bought a ¾” hose end cap, 3/8” x 3/8” x 3/8” T-fitting, 2’ of 3/8” tubing, a 1” long ¾” piece of threaded PVC, and the most difficult parts for me to find were the parts to convert the ¾” garden hose to 3/8”. I could not find the Rainbird sprinkler system swivel fitting that steps down the size that Douglas used. I ended up finding two pieces at a Tractor Supply store that put together will do the same thing. It just needed a rubber seal which I had a spare from the two pack of hose end caps I bought. I also could not find the black tubing that he used which appears to be the same used on the engine. After having this clear PVC tubing installed and using the engine several times this weekend, it didn’t appear affected by anything yet.
Here are the parts laid out:

Everything put together:

Once I got to my outboard I had to figure out which hoses were which. I traced the cooling exit hose to where what I later found to be the thermostat. I then saw a larger hose just above it that leads around the back and down into the lower section of the outboard. I removed the hose and found it must be the water cooling hose since there was a little residue and salt:

I then cut the cooling hose and inserted the T-fitting:

I used a little dish soap on the fitting to slide the hoses on easily. One thing I learned after I finished is that the T-fitting was slightly interfering with the latch when the cover is put back on. Luckily I was able to move it out of the way, but if you tap into this line, you may want to move it slightly. I also cut the hose shorter so it fits better under the cover and doesn’t interfere with anything.
I then removed the threaded plug from my home made kit, connected up the garden hose, and let it flush the engine. It works great!

This image doesn’t show the water flowing out of the upper coolant exit, but I fixed that separate problem minutes later.

This kit cost me less than $5 in parts and is much more convenient than using the hose adapter that Honda sells. Honda’s connects to the lower portion of the outboard on a small threaded inlet. It would be very difficult, if even possible to reach from the boat cockpit to connect their flush kit. Having this adapter in the top of the engine makes flushing a breeze. Now, when ever I get back from sailing, I simply remove the cover, connect up the hose and flush the engine while I finish putting everything away on the boat.

Justin
Previous Owner of Sapphire Breeze - 1982 Catalina 25 SK/SR
My sail blog site: https://reveriesailing.com/

Edited by - on

Lightnup
Master Marine Consultant

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USA
1016 Posts

Response Posted - 08/07/2006 : 10:13:21

Justin - This should also go into Tech Tips

Steve

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Justin
Admiral

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502 Posts

Response Posted - 08/07/2006 : 10:30:18

Oh yes, I meant to ask about that in my original post. I have several projects that I have written up posts that I think I can easily make for Tech Tips. I just looked at the Tech Tips section on how to submit. I'll do that sometime soon.

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.