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Hi

I recently had a new shortblock installed when my 582 blue top reached 8yrs/500 hrs, rather thatn strip the old one that was ruinning fine(Aquilla microlight at Ballito, KZN).
My old 582 ran exactly at a constant temp of 60 degrees.
During the run in of the new shortblock, the temps would very quickly go VERY high, over 80, even up to and past 9093, so I had to do the run in in stages.
After the +- 1 hr run in and during 1st short test flights, the engine was still running just as hot


I was very concerned and we tried the following:
* Tested water sender sensor / instruments (digital), boiling water registering 99 degrees, ok.
* Tried swapping the radiator that had been recored - no diff.
* Thermostat temporarily removed, temp down a few degrees.
* Thermostat tested in boiling water to check opening properly - left out for now
* Idle jets changed from 45 to 55, idle down from 2000 to 1800 and rougher (richer) up to 4000 due to richer mixture (now sounds same as old engine!), no effect on temp [jest were changed with new shortblock].
* Mid range needle changed to richer setting - better, stopped EGT's overheating past 625 degrees - fixed that problem.
* Result-> temp now 80/82 instead of 86+

Now after 10 hrs, the engine runs at abou 78 degrees at a +- steady 4500 rpm. If I put more load on the engine up to a constant 5000/5500 [e.g. with a pax] the temp quickly climbs to the 83/85 temp.
If I push it harder it gets even hotter.

The manual clearly statres normal temp range is 60 to 80 and 80 is the max, so I am very concerned

Any suggestions ?

Thanks
Peter
  • Re: New 582 shortblock overheating

    by » 10 years ago


    If you are just running it on the ground you have a reduced air flow. Once in the air those temps should come down. If they do continue to stay too warm then you may want to consider a needle or jet change to increase the fuel some.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: New 582 shortblock overheating

    by » 10 years ago


    The 1st hour run in was done on the ground, the balance of 9 hours has been done in the air. Beeing on the air vs the ground has made little difference. The needles have two settings are are on the richer setting. The idle jets are also the richer setting ones. The full throttle jets were not changed - so the carbs are essentially the same as before the new block was fitted. The 2 EGT temps are normal, just the engine temp way up..

    Thanks
    Peter

  • Re: New 582 shortblock overheating

    by » 10 years ago


    I guess it will run a bit hotter until it is bedded in.

    you could look at

    1 airlocks in the cooling system (perhaps unlikely with your engine/radiator relative positions)

    2 Antifreeze mixture too strong

    3 crud blocking some of the radiator channels

    Bob P

  • Re: New 582 shortblock overheating

    by » 10 years ago


    If you addressed what Panther has suggested and have had no luck, then maybe a re-jetting for a while may help out. The next size jet will help it run a little cooler and if at some point as the engine breaks in better you can always go back to the original jet. Out of curiosity what is your field elevation?

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: New 582 shortblock overheating

    by » 10 years ago


    Elevation is 200 ft above sea level, field is at the coast in Ballito, Kzn, SA.

    THanks Peter

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