OS91FS loose front bearing
#1
Member
Thread Starter
Join Date: Mar 2005
Location: Box HillVictoria, AUSTRALIA
Posts: 82
Likes: 0
Received 0 Likes
on
0 Posts
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?
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?
#2
Senior Member
Join Date: Nov 2002
Location: Sterling , CO
Posts: 6,059
Likes: 0
Received 0 Likes
on
0 Posts
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.
#4
My Feedback: (-1)
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.
#5
Senior Member
Join Date: Aug 2003
Location: Wilson, NC,
Posts: 2,057
Likes: 0
Received 0 Likes
on
0 Posts
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.
#6
My Feedback: (-1)
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.
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.
#8
Member
Thread Starter
Join Date: Mar 2005
Location: Box HillVictoria, AUSTRALIA
Posts: 82
Likes: 0
Received 0 Likes
on
0 Posts
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!