need help identifying my engine
Hangar 9 nut | 31/07/2016 00:57:22 |
![]() 243 forum posts 25 photos | I have two OS 61rf non pumped engines but they have two different size rear bearings can someone tell me why this is from the outside they look the same ! |
Owdlad | 31/07/2016 04:46:50 |
222 forum posts 140 photos | I would guess the larger bearing engine is a later model Edited By Owdlad on 31/07/2016 04:50:13 |
Hangar 9 nut | 31/07/2016 17:50:54 |
![]() 243 forum posts 25 photos | Thanks Owdlad could it be one is a long stroke and therefor has bigger bearing !
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Hangar 9 nut | 02/08/2016 16:24:32 |
![]() 243 forum posts 25 photos | All sorted now new bearings on there way from Modelfixings,Owdlad I think you are right ! |
Martin Harris | 02/08/2016 17:26:10 |
![]() 8175 forum posts 206 photos | OS have specified some "odd" sizes in the past - it may be that they were getting difficult/expensive to source and they modified the casings to take off the shelf bearings. You are always best measuring the old ones very carefully - it's not unknown to find bearings in model engines with a mix of imperial and metric dimensions! Edited By Martin Harris on 02/08/2016 17:28:26 |
Hangar 9 nut | 02/08/2016 21:45:51 |
![]() 243 forum posts 25 photos | thanks Martin I got an OS 61rf in a model along with a spare rear bearing I then purchased another OS 61rf which needed a rear bearing so I thought I had a bearing that would suit but hey ho the new engine had a larger bearing but all sorted now sent them off to Modelfixings and the new ones aRE IN THE POST ! |
Bill Michie | 04/08/2016 12:01:02 |
86 forum posts 5 photos | Yep, correct; the earlier RF/SF (long-stroke) OS .61's had a smaller rear bearing, whereas the later ones had a bigger dia (I think, for a bigger dia crank as well as OD). Look closely at the engine crankcase, and the earlier ones have a more noticeable reduction in case dia at the brg position, the later ones show only a very slight reduction in diameter.
Bill |
Hangar 9 nut | 04/08/2016 15:14:49 |
![]() 243 forum posts 25 photos | Received bearings today from Modelfixings and they fit like a glove cant wait to run it and tune it to my pipe! My other RF obviously has the smaller bearing.Great service from Modelfixings by the way ! |
Percy Verance | 04/08/2016 19:34:17 |
![]() 7385 forum posts 143 photos | H9 You'll find it's the other way round I think. You tune the pipe to it.......... |
Hangar 9 nut | 04/08/2016 21:58:39 |
![]() 243 forum posts 25 photos | Yes Percy the wording came out wrong !
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