O.S 28 Snapped crank  
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Truggy >> O.S 28 Snapped crank
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O.S 28 Snapped crank - 7/8/2008 1:06:22 AM   
herb99


 

Posts: 59
Joined: 1/23/2006
From: , AUSTRALIA
Status: offline 		I have had it with my O.S 28xz, its been nothing but trouble from day 1.
First it was the carby that was dodgy from the factory (would run really rich with the LSN turned all the way in).
Then it needed a new conrod rod after 10 litres (fair enough general wear and tear).
Now the end of the crank has snapped off.
I was 3 laps into my 1st heat for the day, when the engine stopped.
The engine has done 13 litres.
Any ideas why this might have happened?
I dont know whether to put a new crank in it or just get a new engine. What do you think?
I wont be buying an O.S again.




From the back of the flywheel.

[/quote]


< Message edited by herb99 -- 7/8/2008 1:07:40 AM >
       Post #: 1

RE: O.S 28 Snapped crank - 7/8/2008 2:44:55 AM   
twomanytoys


 

Posts: 4373
Joined: 1/23/2007
From: , PA, USA
Status: offline 		That looks like the nut was too tight. I am a mechanic and it happens to me all the time. It dont take much to overtighten the nut and stress the crank. The weakest part of the crank is right there at the end of tehtreads. They dont need to be super tight.

_____________________________

J et A ssisted T ake O ff

(in reply to herb99)
       Post #: 2

RE: O.S 28 Snapped crank - 7/8/2008 4:31:30 AM   
ericem



Posts: 1762
Joined: 1/10/2006
From: Maple, ON, CANADA
Status: offline 		Same thing I see at a concrete shop I work at as a mechanic (new job ) . Many of the smaller japanese motors that are like 50CC's even snap and they are VERYY thick shafts. I never thought it was possible, but so many of the motors are being tossed just because off the cranks snapping from being overtorqued.

So imagine with these little shafts and how much we torque them down it's amazing actually how tight I have gone and didn't experience this issue with my .21 and .28 motors.

(in reply to twomanytoys)
       Post #: 3

RE: O.S 28 Snapped crank - 7/8/2008 10:29:08 PM   
joelgould111


 

Posts: 648
Joined: 8/30/2006
From: london n14 brap, UNITED KINGDOM
Status: offline 		i did it on an hpi.15 engine just by haveing the clutch engage tooo late it hit soo hard it snaped clean off lol

_____________________________

full ally t-maxx.........tamiya nitrage with race exhuast..........cen ct4s..........hpi rs4 evo 3............
annsman

(in reply to ericem)
       Post #: 4

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