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Honda bf8a block replacement
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Author:  mob [ Nov 19th, '17, 14:23 ]
Post subject:  Honda bf8a block replacement

Earlier this year I posted about my Honda bf8a getting a hole in the block and also posted about my decision to buy a new outboard.  Well that never happened.  My prerequisites were twin cylinder, fourstroke with good reverse that would fit in my well (transom mount).  In fact I was looking for my bf8a, so have decided to try and save it.  
I have purchased a used block on ebay and, assuming it's ok, hope to get it going over the  Christmas break. The list of spares for this project so far is as follows :  head gasket,  manifold gaskets, thermostat housing gasket, thermostat (the old one fell to bits and was removed years ago), rings, oil pan gasket.....anything else?

Author:  Tinggu [ Nov 19th, '17, 15:32 ]
Post subject:  Re: Honda bf8a block replacement

We have an elderly BF8. Do you know the reason for the hole? Anode failure? I would be interested in hoping to stop ours going the same way. Good luck with the project. Hope you'll keep us posted on the way.
Pete

Author:  mob [ Nov 19th, '17, 17:52 ]
Post subject:  Re: Honda bf8a block replacement

I guess it may have been anode failure, there was plenty of it still there but it was17 years old. A part of the jacket had cracked and blown off. I'm yet to dismantle it - the replacement is coming from Canada one day - because I don't want to forget what goes where, but when I do I'll let you know what's what. Hopefully I can get many more years out of it, like my car.

Author:  Ukuri [ Nov 19th, '17, 19:42 ]
Post subject:  Re: Honda bf8a block replacement

Good source for parts as well as accurate information and part numbers.
Good prices (compared to the outrageous prices charged by local dealers) and reliable and timely delivery. I can recommend them
http://www.boats.net/parts/search/Honda ... parts.html

Author:  bachus [ Nov 19th, '17, 20:13 ]
Post subject:  Re: Honda bf8a block replacement

mob wrote:
I guess it may have been anode failure, there was plenty of it still there but it was17 years old. A part of the jacket had cracked and blown off. I'm yet to dismantle it - the replacement is coming from Canada one day - because I don't want to forget what goes where, but when I do I'll let you know what's what. Hopefully I can get many more years out of it, like my car.



Based on the anode on my 1994 vintage Mercury, the anode can get honeycombed and I suspect at this point is at the end of it's life.

Author:  MoodyBlue [ Nov 19th, '17, 20:27 ]
Post subject:  Re: Honda bf8a block replacement

Honda's have a thin section in the casting between the cylinder and water jacket. The rust/corrosion builds up in this area and blows a section usually approx 75 mm square.
The cure is to remove the head and clean out the water jacket, using long suitable diameter drill bits.
It is a problem I often encounter with my Seagull cast iron blocks.

As to your replace ment block, just meticulous clean, and a light hone of the bores.

Author:  mob [ Nov 24th, '17, 09:50 ]
Post subject:  Re: Honda bf8a block replacement

My replacement block has finally arrived from Canada, hooray! I have not had the opportunity to open it and am unlikely to for a few days yet, boo!

Author:  sailboatmike [ Nov 24th, '17, 10:39 ]
Post subject:  Re: Honda bf8a block replacement

What you got a package and haven't opened it??????

Around here a package arrives and its like seagulls attacking chips, none of this, "Im a bit busy" routine.

You have far more self control than I ever would :lol:

Author:  mob [ Nov 25th, '17, 06:29 ]
Post subject:  Re: Honda bf8a block replacement

Whilst the packaging remains untouched it can stay inside on the table. As soon as it's opened it will be relegated to the shed, but it's 2 months since the last clean up so horizontal space is a mere memory.

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