Replacing coolant hoses. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 04-07-2012, 07:21 PM Thread Starter
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Replacing coolant hoses.

So after putting my bike back together, I'm noticing a few leaks here and there. I figured since the bike is an 86, it can't hurt to replace the hoses. Another thing I'm noticing is its running really hot, so I might as well replace the thermostat, and cap while I'm at it. Does anyone know the sizes of the coolant hoses? The ones going to the cylinder heads, radiator to block, radiator to thermostat, and thermostat to filler neck?

I'm going to attempt to bend the coolant hoses myself, and see just how far I get with it. The main hoses leaking at the moment, are the thermostat to radiator, and back cylinder to thermostat. If anyone knows these sizes it'd be greatly appreciated.
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post #2 of 16 (permalink) Old 04-07-2012, 07:45 PM
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when I put my engine back in, I had a few leaks in some hoses after running the engine for a while, even though I thought I tightened everything down, but it turned out that the clamps needed to be tightened even further. After that, no more leaks....



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post #3 of 16 (permalink) Old 04-07-2012, 08:25 PM Thread Starter
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That's what I figured also, but some of the hoses I didn't even touch, yet they're leaking. Overheating is becoming an issue as I live in Florida, and its getting hotter out now. So I can't really have any issues with my cooling system. I might need to alter my coolant mix for the weather, right now I'm running about 50/50. Turns out those o-rings for the 3 screws on the stator cover were junk. Bought brand new ones because everyone says to, one of em so far ripped.
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post #4 of 16 (permalink) Old 04-07-2012, 11:27 PM
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Quote:
Originally Posted by Conradzz View Post
That's what I figured also, but some of the hoses I didn't even touch, yet they're leaking. Overheating is becoming an issue as I live in Florida, and its getting hotter out now. So I can't really have any issues with my cooling system. I might need to alter my coolant mix for the weather, right now I'm running about 50/50. Turns out those o-rings for the 3 screws on the stator cover were junk. Bought brand new ones because everyone says to, one of em so far ripped.
The 50/50 coolant mix is good for you year around in Florida. The coolant will give you a higher boiling point than pure water, as well as containing corrosion inhibitors.

If you have ruined/ripped one of the little O-rings sealing the screw heads on the stator cover, then get another, or it WILL leak around that screw.

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post #5 of 16 (permalink) Old 04-07-2012, 11:40 PM Thread Starter
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Went ahead and just coated em in rtv, not spending more money on that stupid orings.
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post #6 of 16 (permalink) Old 04-08-2012, 01:15 AM
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an o-ring kit at HF is only 10 bucks.. the o-rings for the coolant hoses can be picked up at napa for under a buck each... RTV is not good
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post #7 of 16 (permalink) Old 04-08-2012, 02:42 AM
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The 50/50 coolant mix is good for you year around in Florida. The coolant will give you a higher boiling point than pure water, as well as containing corrosion inhibitors.
Wrong, a little higher water to mix ratio is better down south. Water transfers heat better. Antifreeze acts more of an insulator. Antifreeze does just that, not as much freezing there. Even a low percentage of mix will prevent corrosion. I would say 70water/30antifreeze would be good for you and even down to 80/20 would be max to me anyway~
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post #8 of 16 (permalink) Old 04-08-2012, 06:35 PM
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Unless there is something wrong with your cooling system, a 50/50 mix of distilled water and ethylene glycol will work fine, unless you are in a really cold climate, then I would use up to 70% ethylene glycol. Use only ethylene glycol, alcohol based coolants like DexCool will not work. They don't even work well in engines supposedly designed for them.

I live in AZ, where it is HOT (115 degrees average in the 7 month summer) and I use the 50/50 mix with no problems. If it still overheats, checked for a bad t-stat, plugged radiator, plugged coolant passages in the engine, or a bad water pump. Also check to see if the coolant fill cap is holding pressure.

It is not uncommon for engines that have has tap water in them to have everything plugged up. That stuff contains minerals and acids, and will start corrosion in an aluminum engine, and once it starts, corrosion just gets worse and worse.

I recommend the stock hoses. Yes they are expensive, but should last forever. Mine are 10 years old, and are still like new. You don't want to use a hose that might not be able to deal with the heat/pressure, or have a kink in it. OEM hoses are preformed to fit right.

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post #9 of 16 (permalink) Old 04-08-2012, 10:21 PM
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The standard recommendation is to use a 50/50 mix of antifreeze and water. This represents a compromise between cooling efficiency and the ability to prevent the mix from freezing during cold weather. After all, the initial purpose of antifreeze is to prevent freezing.

But a 50/50 mix does not give the best cooling. For improved cooling in hot weather, we should use less antifreeze and more water, perhaps going to a 25/75 or a 20/80 mix ratio.

Temperature drops ranging from 10 - 15 F are typically obtained by decreasing the mix from 50/50 down to 25/75 or perhaps 20/80. It is not possible to give precise numbers here because of uncertainty in knowing exactly what the initial mix was, and so forth.


Source

After a bit of net surfing I found that that others are saying lower ratio of anti freeze to water does improve the cooling. Just need the higher ratios for cold freezing weather.
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post #10 of 16 (permalink) Old 04-08-2012, 11:13 PM
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in Afghanistan, we were using as little antifreeze as possible due to the extreme high temp. but unless you live in death valley, there is no need. 50/50 will be fine.
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