582 Water Temp.

[peterk]

My old 582 blue top used to run at about 60/65degrees pretty constantly no matter what
I replaces the short block (effectively new engine) earlier this year due to the old one reaching 500hrs/8 yrs or similar, instead of a full overhaul
The new one has now done about 50 hrs and has run very hot from day 1

I have tried everything from jets/fuel mixture to removing the thermostat to collent mix to diff radiator to checking sendor and guage etc
These things helped a certain extent but thats all
The only thing I have not yet done is to check the water pump...

Currently it runs about 75 to 80- crusing and upwards to high 80's on extended climbs..., so I try limit these
Still looking for a proper solution!

Maybe its something ROTAX has changed in the newer engine blocks ?

Peter

[Duck Rogers]

hey Soekiwindi

make sure you are running the correct anti freeze ratio and type.....after flushing mine recently, i mixed it 50-50 ( MIdas anti freeze).....the engine ran hot..83-85 degrees.

I drained the mixture, and used castrol anti freeze...ratio of 90% distilled water -10% Castrol anti freeze.

problem solved.

Also make sure that you don't have an air lock. When you fill up, loosen the nut with the allen key on top of the engine and make sure that all the air gets outs.

Hope this helps you.

The most likely solution to the problem...

[soekiwindni]

Thanks for all the input. Will check the sensor this weekend. Eliminating one thing at a time . I can't wait to get the problem fixed and to be back in the air.
Soekiwindi

[Triker]

Just a question regarding distilled water.
I recently worked on my Cobra radiator and with obvious water spillage during that process replaced the balance water needed with plain borehole water.
Is that improper procedure?
The water that came out was a green color. Is that fine?
thanks

[Duck Rogers]

Just a question regarding distilled water.
I recently worked on my Cobra radiator and with obvious water spillage during that process replaced the balance water needed with plain borehole water.
Is that improper procedure?
The water that came out was a green color. Is that fine?
thanks

If I'm not mistaken, distilled water is also "de-ironed" water. Borehole water contains a truckload of iron. Best to get distilled water.
The green colour is the antifreeze that was mixed in with the distilled water

[Mogas]

+1 on the borehole water. Distilled water, easiliy available at auto shops is the stuff to get for the coolant mix.
Then it was mentioned to properly bleed the system, this is very important as an air bubble can cause the pump to cavitate.
If I recall correctly there are two places to bleed, one on the pump housing and the higher one of the two on the top of the cylinder head. Both are m6 (10mm spanner) bolts with copper washers, just crack them open and wait for the bubbles to stop before nipping them up. Do this a couple of times in between ground runs until no more air comes out.

[John.com]

+1 on the borehole water. Distilled water, easiliy available at auto shops is the stuff to get for the coolant mix.
Then it was mentioned to properly bleed the system, this is very important as an air bubble can cause the pump to cavitate.
If I recall correctly there are two places to bleed, one on the pump housing and the higher one of the two on the top of the cylinder head. Both are m6 (10mm spanner) bolts with copper washers, just crack them open and wait for the bubbles to stop before nipping them up. Do this a couple of times in between ground runs until no more air comes out.

How fantastic to be able to search on old posts and get such valuable information!!!

Here are some photos of the bleeding nipples, as my contribution to this post . . . .

Bleeding nipples on the water pump (directly under exhaust manifold) - top one to remove air (for cavitation), bottom one to drain coolant from system

Rotax 582 Coolant Bleeding Nipples - Water Pump.jpg (44.56 KiB) Viewed 8062 times

Bleeding nipple on cylinder head - to remove air from cylinder head

Rotax 582 Coolant Bleeding Nipples - Cylinder Head.jpg (48.87 KiB) Viewed 8062 times

[Sad-Ham]

I have a simillar temp problem on my 582 blue top..... had a look on the waterpump for the bleeding nipples this weekend. Only have the bottom one and not the top one

[John.com]

I have a simillar temp problem on my 582 blue top..... had a look on the waterpump for the bleeding nipples this weekend. Only have the bottom one and not the top one

Hey Sad Ham!

I can only assume that the design change (to blue top) has resulted in the top bleeding nipple on the water pump being done away with. I would not worry, although, as always, it will be best to seek some professional guidance.

Regards,

John

[ger koff]

Soekiwindi
Was the head skimmed when the rebuild was done?
Has the ignition timing been set correctly since the rebuild?

[John.com]

Soekiwindi
Was the head skimmed when the rebuild was done?
Has the ignition timing been set correctly since the rebuild?

Please can you enlarge on the results of these two things? i.e. What could result if either was not done?

Many thanks, John

[skybound®]

What are the dangers of it being too cool?

No answers yet? Anyone?

[Jonfer44]

Here is an article about flying with a cold engine. This might not apply to what you are asking but you will get valuable information.

http://ultralightnews.com/engineinfo/coldseizure.htm

Jan

[Jonfer44]

Here is another article of interest.

http://www.ultralightnews.com/rotaxpist ... eizure.htm

Jan

[John.com]

Here is another article of interest.

http://www.ultralightnews.com/rotaxpist ... eizure.htm

Jan

Great learnings through these links! Thanks Jan.