OS 50 Bearings

[Steve]

When the bearings go in a OS50 Hyper, is it usually the rear one, front one, or both?

[3dbasher]

When the bearings go in a OS50 Hyper, is it usually the rear one, front one, or both?

usually you change 2 back for every one front.. but i always do both together

[robgt]

Usually the rear one - thats the norm in mine anyway...
Cheers,
Rob

[Nutz]

I replace them as a pair, 1 front, 1 back..........dunno why!

[stumpy]

one of mine has had two new rear and still on original front

[nightstalker]

I do both at the same time being you stick the motor in the oven it can damage the front one if you intend to keep it.
Found a good bearing shop in st neots that can do both front and back for £7.50 better that £22

[kriel]

does OS 50 engine have steel cage on rear bearing or silicone(or teflon)

[Janek]

I do both at the same time being you stick the motor in the oven it can damage the front one if you intend to keep it.

The temperature it reaches in the oven will not damage the bearings, it might burn your finders though

I have never yet needed to replace a front bearing, and I've lost count of the rear bearing in my oldest engine

[Philimon]

In around 7 years of RC flying, mostly planks, I've never replaced an engine bearing. So other than the screwdriver-to-the-crankcase test, what are the signs of a worn bearing?

Tell me to shut up if I'm hijacking this thread

[Steve]

Phil

What fuel do you use - see my other thread on oil in fuel?

[Philimon]

I'm burning out the stock of Prosynth 2000 (10%) that I got from Weston while flying planks. From there on, I don't know. I've read your thoughts about Magnum fuels, and I see your point. More smoke does not necessarily mean more protection...

[Steve]

It's just an uncanny coimcidence that since running Magnum for several months, I've started having relaibility issues. Maybe it's just that - coincidence, but I don't think so.

[Philimon]

I've heard the urban ledged that once you've started burning a particular fuel in an engine, you should stick to it. The implication is that its not the fuel per say thats causes the issues, its the change.

I've no scientific facts to back that up, though...

[MartinM]

If the engine is out try pulling up and pushing down on the crank, thats a quick way to test!

I also found less problems IF you heat up the crank case with a hot air gun, the BD type. next time 'you know who' opens the over you don't have to hide...

Martin

(Bekra 16 makes the bearings last as far as I have seen, I only changed them on 2nd hand engines I have bought)

[ChrisB]

Manager

You have mentioned what i was thinking

I have flown helis for 6 years and until last week i have never changed a bearing,,

I always used Model Technics fuel but have used magnum lately,most people i fly with also use Magnum and bearing changes are a regular thing

I am going to try Model Technics Propower 25,i have mentioned it before but i kinda dislike the smell but i do think that bearings should last longer than some people are getting

I know i am flying the models harder than ever now but i still suspect the fuel