Smoke in the wrong place

Previously les_howard wrote:

Once the scavenge pump has emptied the sump it will also pump air as the pump exceeds the oil feed delivery rate by a factor of two. If you have rebuilt the top end there could be some smoky blow-by past the rings entering the crankcase which will be picked up by the pump and sent to the oil tank

HOWEVER I would check the end of the breather pipe as this should also be blowing out smoky gases if there's any getting past the rings...try blocking the end of the pipe by very lightly placing a finger tip on the end...you should feel pulses of air but then a feeling that a vacuum has been created which should happen if the rotating timed breather disc is working as designed.

Les

Thanks Les, I'll do that test next time I run her up, which unfortunately wont be until next weekend due to work and child commitments. Cheers again I'll be in touch when I sort it.

Previously david_evans wrote:

Does it smell like smoke? i.e. burning oil or could it be water vapour from any condensation in your crankcases and eventually your oil. Get the engine properly warmed up (hot) and see if it persists. Let us know how you get on, it will be interesting. You may find it worth reducing the amount of oil in your tank to allow it to reach operating temperature on shorter runs this time of the year. IMHO

Hi David thanks for that I'll try that too. Its definitely smoke not steam as it lingers too long. I'll let you know how I get on next time I fire her up. Cheers.