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Rotax engine - Number of hours on engine before ove rhaul

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ul15rhb(at)juno.com
Guest

Posted: Thu Feb 22, 2007 5:04 pm Post subject: Rotax engine - Number of hours on engine before ove rhaul

Scott, I've got about 460 hours on my 447 and it's never been 

overhauled. I've looked at the pistons and cylinder walls through the 

exhaust port and it's very clean with no carbon. I attribute that to 

the synthetic oil I use. My first engine had about the same hours and 

it looked just as good. I don't plan on doing anything for at least 

another 200 hours. Of course I fly at 5000 RPM which should be prime 

for carboning up.



Ralph Burlingame

Original Firestar, 447

20 years flying it



-- "olendorf" <olendorf(at)gmail.com> wrote:




I had 147 hours on the 447 and it had a good amount of carbon. I'm 

glad I decided to decarbon it. The rings were free and It would have 

been OK for a while longer.  I run Pennsoil for air cooled engines at 

50:1 premix.



After I had decarboned it I noticed some oil dripping from the front 

of the engine and I had to remove the engine and replace the oil 

seals.  I did this at about 160 hours.



Here is how it looked before I did any decarboning.  Looking at the 

rings from the exhaust port always looks good.  If it looks bad then 

it is probably really, really, bad.



--------

Scott Olendorf 

Original Firestar, Rotax 447, Powerfin prop

Schenectady, NY

http://KolbFirestar.googlepages.com





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olendorf

Joined: 06 Jul 2006
Posts: 140
Location: Schenectady, NY USA

Posted: Fri Feb 23, 2007 6:12 am Post subject: Re: Rotax engine - Number of hours on engine before ove rha

Yeah I wish mine didn't carbon up.  I'm very comfortable with the Pennzoil so I'll stick with it. I can get it locally so that makes it easy.  I don't mind taking the engine apart every so often and looking around.  Gives me a chance to inspect everything, clean and paint where necessary.  I would have had to pull it off to replace the oil seals even if I decided not to decarbon.  Once it's off you might as well decarbon it.  Maybe if I had to send my engine off and pay $500 I would think differently.



Everyone has to determine what is best for them for the oil they use and how they run the engine.  As long as the decision isn't "I don't know what to do or how to do it so I'll do nothing and assume it is ok because someone else got 600 hours on their engine"



There is a guy near me that has had trouble with a 503 and all he knew how to do was change spark plugs so he changed them twice in one week because of hard starting.  Turns out the engine needed a decarbon bad.  He had about 280 hours on it.  Sold the engine, bought a 582 because it was easier for him than taking the engine apart and decarboning it.  $80 in gaskets vs. $4000-5000 and without a plane for 6 months while installing a new engine.  I'll go the $80 route.

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_________________
Scott Olendorf
Original Firestar, Rotax 447, Powerfin prop
Schenectady, NY
http://sites.google.com/site/kolbfirestar/

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