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A Little Repair, OS 55

Old 04-25-2016, 03:45 AM
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ETpilot
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Default A Little Repair, OS 55

This OS engine has been in 3 crashes now. First 2 no problem. This last one, though, resulted in engine damage. Broken muffler and crankcase. The engine was new with low hours. So the decision was to rebuild or buy new. I elected to rebuild. I purchased a new muffler and crankcase. BTW, Tower sells 2 E3071 mufflers. Buy the one for the GGT10 engine. It is lower priced, has the pressure tap and fits this engine. The rebuild was simple and easy to do. The engine is ready for the test stand.

Paperweight on the left side, new engine on the right.
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Old 04-27-2016, 04:20 AM
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Gregor32
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Looks good, did you replaced the bearings? they may have damage from the crash and they are cheap anyway.
they can feel smooth when turning but when axially loaded feel rough or notchy.
Greg
Old 04-27-2016, 04:08 PM
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No I didn't replace the bearings. They really looked good and rolled good. I guess when I run it on the test stand I will find out if it was a good or bad idea.
Old 04-28-2016, 08:46 AM
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yes Should have changed the bearings as of late the OS ones dont last long. Also on that broken case dont throw it away as it is still good. I have glued in many carbs with JB weld and held up for many years. In fact better than the screws that hold it in. If ever need to remove the carb a little heat does it.
Old 04-28-2016, 10:12 AM
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Originally Posted by airraptor View Post
yes Should have changed the bearings as of late the OS ones dont last long. Also on that broken case dont throw it away as it is still good. I have glued in many carbs with JB weld and held up for many years. In fact better than the screws that hold it in. If ever need to remove the carb a little heat does it.
+1.
Old 04-28-2016, 03:21 PM
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How did the bench run go? the bearings are easy enough to replace later. Greg
Old 04-29-2016, 04:03 AM
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Thanks for the tip on JB Weld. I was thinking of using JB on the muffler. Now I'll give thought to the carb.

I have not had time for the engine run. I have a GGT10 on the stand. Have to do another run on it then put the 55 on the stand. Will post results.
Old 04-29-2016, 11:27 AM
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JB weld will not work on that muffler its not strong enough and gets to hot there. Sorry. For the carb though it works perfectly.
Old 04-30-2016, 04:15 PM
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Darn, I was hoping to sneak by on the JB muffler repair. Oh well I'll look at plan B.

I did the last run up on the gas engine. I removed it from the test stand and installed the 55 on the stand. Hopefully tomorrow I will see how it runs.
Old 05-01-2016, 03:02 PM
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The engine run was good to go. The engine started right up. It idled smoothly and powered up to full throttle ok. No unwanted vibration. No unusual noise. Ran it up to operating temperature. Then I checked the torque on the head bolts and back cover bolts.

I mounted on the engine on the airplane mount then installed the mount on the plane. I need to get this plane airworthy and flying again.
Old 05-01-2016, 04:32 PM
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airraptor
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One thing on the OS engines in the AX series is to check/retorque the head bolts once the engine is hot. My 120s would have loose head bolts if the engine to warm.

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