Would u or Would u not

[stunks]

On sunday one of my club members engine bearing went in mid flight byt before he took the heli flying when hestarted the engine i said to him that the bearings are going and he said no there not (each to there own) anyway after the engine stopped in mid we took the engine out to have a look at the damage lucky it didnt damage the piston and liner any way after all that i told him (again) that he should change the from bearing also but he said what for it seems fine so isaid to him why not since ur changing the back just do the front one and make the engine like new again but he refuse and said he's not going to change it to me thats like having a shower and putting dirty close back on.

So the question to u is would u change the front bearing if it was u

[rhysduk]

Seriously... you wrote all that and not one bit of punctuation? Bloody hell man... on no wait... I see some parenthesis in there..
Sorry, but I can't even begin to understand that. Something about engines.. no?

[sacko]

Agreed lol

Leave him to it.

[igottomanyhelis]

On sunday one of my club members engine bearing went in mid flight, but before he started the engine again i said to him that the bearings are going, and he said no there not (each to there own). anyway after the engine stopped in mid flight we took the engine out to have a look at the damage, lucky it didnt damage the piston and liner, any way after all that i told him (again) that he should change the front bearing also, but he said why seems fine, so i said to him why not since ur changing the back just do the front one and make the engine like new again, but he refuse and said he's not going to change it, to me thats like having a shower and putting dirty close back on.

So the question to you
would you change the front bearing if it was you ?

my reply!
is that better can you all read it now .,?^£)*
last 2 years running nitros ,done about three bearing changes,the top bearing is never that bad,i have keeped it in thier since new,so it should be ok
this massage contains a great big f*"&%$g big stop.

[Dave Rand]

I have to admit when I started with nitro, Jamiem said to me your engine bearings going and I didnt take it on board flew a few the whole day, and sure enough it went.
what I didn't realise at the time is, when you fly your heli you don't pick up on the gradual change in engine noise.
Moral of the story is listen to your friends.
That only happened once because you no what to listen for next time.

[rexflyer]

change both

[barney]

Its quite normal to have several rears in the life of a motor without requiring the front bearing being changed. If its in doubt, a washout and some light oil then check for any roughness is all thats needed.

Brian

[bolders]

It would seem obvious to change the front bearing at the same time as the rear but the reality is somewhat counter-intuitive and there are a few things that should be considered first.

* Does the rear bearing going generally damage the front bearing or reduce its life
* Is the time to failure of the front bearing short
* Has the front bearing been fitted for a long time/ experienced a large number of cycles.

If the answer to all the above is NO then it is probably best to leave the front bearing as it is.

This is based on engineering reliability principles and the idea that the a mechanical component generally follows a bath tub type reliability curve. This curve can be split into 3 sections

* Component is new - failure rate is high as manufacturing defects and flaws are revealed

* Normal life - failure rate is at its lowest and remains constant during this period

* End of life - failure rate increases and gets higher as time progresses.

So if your front bearing is still in its normal life phase and it is only changed before entering the end of life phase where failure rates increase, the probability of failure will be lower than fitting a new bearing.

[Nick B]

Im with Barney,the fronts last 10 times longer than the rears.

[barney]

I've only changed 2 or 3 fronts...one was after the crank got bent..Concrete is unforgiving!. Another was a clutch stack problem on a raptor 50 that was continually causing problems and the change was more precautionary than necessary. Rears must be around 25 overall. Generally I would say a motor is getting pretty tired before the front needs done and with a 50 class motor I would prob use to 2-4 bearings and 1-2 rings in that time. After that I feel youve had your moneys worth.

By the time a motor has a worn Liner/piston your also going to need /brgs/circlips/gaskets + likely other parts like conrod, gudgeon pin so its not really cost effective IMHO as even after a full re-build youll still not get 100% of new power back as there is wear in the carb.

I think it better to keep it running best you can or buy a New motor at that point.

[Rotorhead]

when you fly your heli you don't pick up on the gradual change in engine noise.

Moral of the story is listen to your friends.

Very true, I had to change the bearing in my 700 a few months back, I couldn't hear it because I got used to it, but the other guys there wheren't so it stuck out like a sore thumb to them.

Once changed it was really apparant that it was on it's way out, not just from the feel of the bearing but from the sound difference.

[Steve]

Never changed an engine front bearing, ever ever ever.

Vary very rarely change rear bearings, but that's another story which has covered much ground in the past.

[electricsceadu]

like steve it very rare for me to have a rear bearing go
but i have had an os91 take the front bearing out, the cage of the bearing broke up
it started to vibrate like mad with no noise so i stripped the motor to find the front bearing caged in lots of bits
after being changed the motor hasn't needed one since

[karandras]

If i am changing one engine bearing, then i always do the other one at the same time.

When i used to race rallycross if a bearing went on the buggy, i'd change every bearing on it - any that were ok went into a pot of used but ok bearings for emergency use at the track.

But thats just me, i'm odd like that.