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PostPosted: Sat Jan 17, 2015 7:29 pm 
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Joined: Wed Dec 10, 2014 9:19 pm
Posts: 37
Location: New Jersey
1995 Rotax 583, so does the water pump push coolant through the Engine or pull it through which leads to the question what radiator goes where like from the water pump to top of radiator or bottom depending on the push/pull question. I've looked in the shop manual but it didn't say?
Thanks


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PostPosted: Sat Jan 17, 2015 10:09 pm 
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Joined: Wed Jan 08, 2014 12:42 am
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It's drawn through the Engine by the water pump beneath the exhaust. I capped off the top port on the head its not necessary for strait radiator flow. The thermostat is the port on the back side of the head.


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PostPosted: Sun Jan 18, 2015 7:20 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Back when I put my 440 ROTAX in my Pilot I talked to a guy who use to road race these engines they trans planted them into a small road race car of some type anyways he said I would not need the T stat since I didnt have the cold to deal with in the winter so I never used one never had any cooling problems so far, no clue if this applies to the ROTAX your using just thought I would share what I learned about my Type 454 Engine swap.


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PostPosted: Sun Jan 18, 2015 10:37 pm 
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Joined: Sun Jan 10, 2010 9:14 pm
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Location: Ma
Exhaust side coolant hose to bottom of the radiator. Engine head coolant line to the top of the radiator is how I set my 582/583 up.


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PostPosted: Mon Jan 19, 2015 12:53 am 
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Joined: Wed Jan 08, 2014 12:42 am
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That's how I have mine set up as well. There are a couple different water pumps. Some jet skis have a side facing outlet that you will need in order to run electric start. The stock water pump on my 617 faced downward and would hit the starter. I ended up just cutting it off and turning it 90 degrees. The radiator I used is a 99 honda civic two core. You can get them on eBay with a electric fan for about $75. I also added trail tech vapor temp sensor into the head where the factory skidoo sensor was.


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PostPosted: Mon Jan 19, 2015 12:09 pm 
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Joined: Wed Dec 10, 2014 9:19 pm
Posts: 37
Location: New Jersey
jknarfal wrote:
It's drawn through the Engine by the water pump beneath the exhaust. I capped off the top port on the head its not necessary for strait radiator flow. The thermostat is the port on the back side of the head.


My 583 is a Farr kit and came with the port on top of the head. So should I change that to the side of the head? Does it make a difference?


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PostPosted: Mon Jan 19, 2015 5:04 pm 
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I'm not sure on a 583 but my 617 has the thermostat on the back. I took the top outlet and swapped it to the side due to the 90 degree outlet. If you use the top port I don't believe you will have a thermostat.


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PostPosted: Mon Jan 19, 2015 6:21 pm 
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Joined: Sun Jan 10, 2010 9:14 pm
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Location: Ma
old geezer wrote:
jknarfal wrote:
It's drawn through the Engine by the water pump beneath the exhaust. I capped off the top port on the head its not necessary for strait radiator flow. The thermostat is the port on the back side of the head.


My 583 is a Farr kit and came with the port on top of the head. So should I change that to the side of the head? Does it make a difference?


It does not matter what port on the head that you use. What does matter is... Does it have a thermostat in there?
Regards


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PostPosted: Tue Jan 20, 2015 8:57 am 
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Joined: Wed Dec 10, 2014 9:19 pm
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Location: New Jersey
Are these radiator hoses 1inch to the rotax block or are you squeezing on 7/8 hose?


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PostPosted: Tue Jan 20, 2015 5:34 pm 
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Joined: Sun Jan 10, 2010 9:14 pm
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Location: Ma
old geezer wrote:
Are these radiator hoses 1inch to the rotax block or are you squeezing on 7/8 hose?


I used 1 inch hose.


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PostPosted: Sun Jan 25, 2015 8:30 am 
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Joined: Mon Aug 05, 2013 12:19 am
Posts: 71
On rotax engines like the 470,521,580,583,617,670 the waterpump pushes the coolant through the Engine, On all the engines I sell I remove the thermosat so either outlet on the head can be used depending which is best for how you run your hoses


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