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Old 09 August 2013, 07:19   #1
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Honda BF75A Hot water

Hi All
I was flushing my Honda BF75A this morning running on muffs and noticed water coming out from the flush tube, but the water was hot
All other circulating water from telltale and prop was cold.

Is this normal ?

I only occasionally use the flush tube as i usually flush on muffs and have never noticed any water coming from here before.

Thanks
Lee
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Old 09 August 2013, 12:31   #2
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Honda BF75A Hot water

Hi All
I was flushing my Honda BF75A this morning running on muffs and noticed water coming out from the flush tube, but the water was hot
All other circulating water from telltale and prop was cold.

Is this normal ?

I only occasionally use the flush tube as i usually flush on muffs and have never noticed any water coming from here before.

Thanks
Lee
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Old 09 August 2013, 13:33   #3
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I suspect the flush tube bypasses the thermostat and goes straight into the block.
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Old 09 August 2013, 14:37   #4
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I suspect the flush tube bypasses the thermostat and goes straight into the block.
Should there not be a non return valve
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Old 09 August 2013, 14:39   #5
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Our BF90 doesn't pass any water from the flush port. It goes to a check valve so should seal closed under normal operation and only open when mains pressure water connected to the port.
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Old 09 August 2013, 16:40   #6
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I have traced the tube back up to the check / non return valve and took it apart.
It was all scaled up so I descaled and cleaned it, I put it back together but it still has water flowing from the outlet port.

I just noticed that the water coming from the tell tale and the prop are a little warm / tepid. Is this normal ?

Can I just seal up the check /non return valve with silicone ?
Or is there likely something else wrong ?
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Old 09 August 2013, 16:48   #7
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That looks like a poppet valve. Check the free length of the spring-it might just need a new one.
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Old 09 August 2013, 16:57   #8
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That looks like a poppet valve. Check the free length of the spring-it might just need a new one.
In simple car mechanic terms does free length mean how springy it is and if so would stretching it work possibly.
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Old 09 August 2013, 18:20   #9
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Quote:
I just noticed that the water coming from the tell tale and the prop are a little warm / tepid. Is this normal ?
I can't speak for the BF75, but our 2008 BF50 has quite a hot telltale — I'm assuming that Honda's preference is to tap into the plumbing after it's been around the block. (As opposed to our Mercury 2-strokes, which hardly even take the chill off — presumably the connection is pretty much the next thing after the pump on those).
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Old 09 August 2013, 18:25   #10
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My understanding of the poppet valve function is to allow excess water pressure with the engine running UNDER LOAD (revving) to bypass the thermostat system and exit via the telltale !
The springs are probably available as part of a kit from a dealer. Having stripped it I'd just get the kit and forget about it !!
If I'm wrong blame the box of Pinot Grigio my wife and I are inspecting on Scotlands beautiful west coast........
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