Rotax 582 engine de-coke

Hi there,

I fly a microlight equipped with a 582cc Rotax (grey top) motor, The engine has done 280 hrs and still runs like a swiss clock. I would like to ask if anyone knows when to do an engine "de-coke/de-carbon" servicing and whether if it's really paramount to do so, any warning signs and what is exactly involved if so. I can't find any information in my Rotax engine manual. Any comments/opinions would be greatly appreciated by you all.

thanks in advance

Dennis

Carbon build-up.

Sometimes there is practically no build up. If you are concerned, remove the exhaust system and plugs and inspect with a torch and a small angled mirror. You will get a good look at the pistons and bores as well.. Nev..

Dennis

There's a schedule in the maintenance manual (P10-2) which lists checking clearances/wear on pistons, cylinders and rings every 150hrs, 100 if in dusty conditions. If checks through the exhaust port don't indicate a significant build up before this I'd think this would be an appropriate opportunity.

When I bought my Super Pup, the engine (582 grey) had 250 hrs on it, I did a top end OH about 10 hrs later and found a significant carbon build up.

I've seen this job done in-situ at the field but when I did my engine I lifted it out and took it home so I could do the work with everything handy in the workshop. In my case I think having the tools etc to hand made up for the few minutes it took to lift out and replace the engine. Either way I didn't find it a particularly difficult job, as long as you have the right guidance if you don't already have the knowledge yourself.

BTW There's a book called the 'Repair Manual for 462-532-582 UL' which I found useful but I haven't been able to find it as a Rotax download anywhere. If you need guidance and you don't have anyone to hand, try to get a copy of that.

Mark

Dennis, try www.800-airwolf.com/articles.htm, a lot of good info there. Kind regards, Don.

thanks very much Gents! some really good information you've given me here.

cheers

Dennis

Dennis,

Try this link. Can't remember where I got it from (possibly the engine section in these forums) but it gives you a good rundown. Click the "show me what you did" link.

http://home.epix.net/~jlartin/decarbon.html

Mike

thanks Mike and all

Thanks Mike & all,

the information you've provided me is extremely useful. I'm a typical electrician that doesn't like touching mechanical stuff:laugh: but this seems like a very simple task.

thanks again

Dennis

When you have looked at the bores through the ports, have a look at the rings. It should be possible to see them just move in relation to the piston, as ypo rock it up and down. Look for a slight oozing of oil at the top and bottom of the rings, that would indicate that they are not sticking.

If you have any doubts it is not too big a job to remove the bores and fit new rings, hone the bores, and do the de carbonising of the piston. You will then have an engine with a good life expectancy. Get someone who knows the engine to help you and read up about it as suggested by methusela.

cheers!

Hi Ian and all

thanks for your advice mate, will do. Some really good information in this post gents.

thanks again!

Dennis;)