Rotax 503 Back in service
in 2 Stroke Technical Questions
13 years ago
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by Zack El » 13 years ago
I found some nice video's on youtube, the information you provided is great, thanks alot.
Someone told me that I can inspect some parts of the engine thru the intake and exhaust openings. I do feel comfortable stripping the engine but i heard its better not to open it it if not needed.
I will clean out the carbs this weekend, I should be able to tell if the engine was fogged (preserved), if so then I will try to crank it up after ensuring that the fuel lines and fuel system are clean, the spark plugs and gear oil are changed.
As you said before, I dont think these engines will rust that easy like the 582, and would just a little rust be very harmful if its on the crankshaft? can I tell when its running?
The engine has been inside a hangar with other airplanes for the last 3 years, not exposed to the weather.
Zack
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by Mircea Busuioc » 13 years ago
I had similar case with 582 with about 780 hours recorded on hour-meter and without any previous maintenance record. What I did was:
- removed the exhaust and spark plugs and had a look inside. In my case I see that there are no big deposits, marks from previous honing operation are still visible and no signs of damage. I considered this enough for starting up;
- dismantled the carburetors and cleaned them well;
- replaced all fuel lines;
- checked the oil level in the gearbox.
Engine started up easily after that. I don't know if this can be named a "standard procedure" but I'm sure it this will work for you too.
Thank you said by: Zack El
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by Nick Axworthy » 13 years ago
There are no hard and fast rules Zack...its more of a piece of mind thing,
If any of the bearing surfaces are in anyway pitted things will wear out quite quickly,
Looking through the exhaust ports you can see part of the piston rings and the top of the piston but as far as I know non of the crank bearings or small end bearings...dont think anything is visable through the inlets,
Fingers crossed it maybe fine,
There is a testing tool you can buy from the Rotax dealer in the UK for testing bearing clearance by just removing the spark plugs...its about £60 or about $100 I think...you could run it and keep an eye on how things are shaping up...it will show if the bearing are stating to wear out after you have run it a while.
Nick.
Thank you said by: Zack El
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by Zack El » 13 years ago
You are right its mainly the peace of mind you get when you know that your equipent is running propperly.
I took off the carbs yesterday, and looked at the pistons, thy looked pretty well lubricated (wet) and the carbs were nicely lubricated. I will clean the carbs this weekend and see how they look. I was not sure if the prevoius owner followed the recommended preservation methods, but looking at the parts I took off, I think he did a good job preserving them.
where do you guys get your fuel lines from? local auto stores have different kinds, but some forums online do not recommend other than the LEAF or CPS lines.
Zack
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by Nick Axworthy » 13 years ago
I'm in the UK so cant help,
Anyway one things for sure....I bet you will find your ultralight a lot more fon than a Cessna....hope all goes well for you with it.
Nick.
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