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Old 10-07-2008 | 10:04 AM
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brett65
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Default RE: OS .55AX engine break-in and usage


ORIGINAL: Villa

Has anyone noticed that the 46AX manual states that the initial setting for the Low Speed Needle Valve is to be 3/4 turn open? (See page 23 of the manual.) That is three fourth of a turn open. I did not see this as a possible typo because it was a new engine for me so I followed the manual to the letter. On page 18, upper left corner, the High Speed Needle Valve initial setting is given as 1 1/2 - 2 turns open; this reinforced my believe that 3/4 open was 3/4 turn open. (now I believe they meant to state 3-4 turns open). Looks like a typo to me now. I tried to get this clarified earlier by posting on RCUniverse but never got any help. The suggestion was " just follow the manual". I did and had a terrible experience with the engine. Lot of overheating, very dark oil in the exhaust plus and engine out problems. Now I have it at close to 3 turns open and it is running OK. I think OS owes me a new engine but I don't think I'll bother since it is running OK at the moment. I did asked the engine guy at the OS engine forum here at RCUniverse and only got the "follow the manual" story. At that time it had not occured to me that a typo might be involved, but I did ask for help and did not get it. I had to struggle thru this alone.

Dark oil is normal at break in, it has bits of metal in it that comes from breaking in an engine. When I put my new V8 in my mustang, I changed the oil in it after only 1000 miles because it also has fine metal material in it from the rings seating in the cylinder. Its a normal thing on a new engine, but if its doing it after a long while then you may have a problem.