OS91FS loose front bearing
I have an OS 91 FS Surpass II which runs beautifully, nice idle, smooth transition and generally very reliable. Its had a lot of use now and the front bearing is a bit loose in the housing (bearing itself is ok) resulting in a bit of lateral prop shaft movement and hence vibration generally resulting in me losing prop nut mounted Al spinners (expensive!)
I have tried Loctite and shimming but these only seem last a couple of flights before the bearing is once oagain spinning in the crankcase housing and the lateral movement and vibration returns. Apart from buying another crankcase, can anyone suggest a longer lasting fix? |
RE: OS91FS loose front bearing
Other than a new case, JB weld may work. A very thin coat to build up the housing. But I would get a new bearing, the housing may be worn a little.
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RE: OS91FS loose front bearing
Get a new case if it is a Surpass II
If it is the older Surpass I , the cases are no longer available |
RE: OS91FS loose front bearing
Did you by any chance rebuild the engine using BOCA bearings?? I got some bad ones from them but the front bearing started leaking-FLOWING fuel the first time I I fired up the engine. A new set of bearings from a different bearing company cured my problem. The minute your bearing started spinning your case was probably destroyed. You can try installing a new bearing just to see if it is still a press fit. A good new bearing requires you to heat up the case to tap it in.
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RE: OS91FS loose front bearing
I am surprised that using Loctite did not correct the problem. As a result I suspect that the case is cracked in the area of the bearing.
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RE: OS91FS loose front bearing
ORIGINAL: Villa I am surprised that using Loctite did not correct the problem. As a result I suspect that the case is cracked in the area of the bearing. |
RE: OS91FS loose front bearing
should be using red or green locktite as the heat will soften the white and blue
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RE: OS91FS loose front bearing
Thanks everyone for the feedback. I did use blue Loctite. I'll try a red. No not BOCA bearings, NHP I think. A new crankcase is about half a new engine price wise and given previous replacement parts, its getting to be a bit like grandpa's axe. I'll try a few of your suggestions and save my money for a new pumped one! Half the fun is in the tinkering!
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