Hi guys,
I have an MVVS 2cc blue head glow engine which runs great, however it blows raw fuel out the front bearing continuously, enough that you can see it doing it.
The engine has now run around 30oz of 5% nitro, 18% oil with extra castor to bring up to 20%, the original oil content is 60/40 synth/castor, so in the end i have 50/50 with the addition.
When i cut the throttle the engine stops instantly, no run on from air getting into the engine, should i replace the bearing or is this an issue with this engine, makes one helluv mess [:@]
Cheers
Steve

Steve,


I would say; live with it!

But if it really bothers you, there are several threads in the general discussion area of "Glow Engines", in which I participated, stating the leakage is not a bearing problem.

It is more of a sealing issue, between the crankshaft front rotor and the crankcase.

If your engine can be stopped by cutting the throttle, it cannot be too bad.

If you want to replace the front bearing with a sealed unit, you would also need to install it with silicone RTV, on its outer race (to seal the crankcase) and in the inner race (to seal the shaft).
Otherwise fuel will seep through despite the bearing seal.

Also, contact sealed bearings have a lower RPM limit than open ones.
Make sure the one you get, does not offer a lower limit than the original and that it has the same heat clearance rating (probably C3).

Hey Dar,
Thanks for the info, engine runs good but this is the only one i have which is currently blowing this much fuel out which is why i was worried, i will live with it for now.
Cheers
Steve