bf40 Steam from exhaust

[Jbub1968]

After engine heats up steam starts coming from top exhaust port. Just replaced impeller that was missing 2 blades. Found some pieces in thermostat, Tell-tale and behind water Jacket cover. Blew air through tell-tell, thermostat opening and through bottom water tube. also water from hose through same areas. Oil Compression check was in spec. It steams alot more after coming off plane after a long run. then after idleing it lessen's. Is this normal? What could be the issue?

 

[Jbub1968]

Re: bf40 Steam from exhaust

Also, No overheat alarms(checked temp sender working in spec). Replaced thermostat. The engine is a '99 Any idea's would be appreciated. Thank's John

 

[hondon]

Re: bf40 Steam from exhaust

We are not there to see what you are seeing , but in general steam back there is normal.Also,generally when you back off plane you not only get some steam but also a nice dribble of water.After you are all warmed up and running nicely feel around the exhaust housing near the water line.If it is way hot we have a problem.Why the impeller failure? Remember when flushing this unit YOU MUST cover the water pickup under the cavitation plate!

 

[Jbub1968]

Re: bf40 Steam from exhaust

Thanks Hondon. I'll try feeling around the cavitation plate today. Not sure on the impeller failure. I just bought the motor and it appears that the impeller was never serviced. I did some service on the motor(fluid changes, spark plug replacement and water pump). I'll try covering the pick-up as I was unaware that needed to be done. Any other service I should do on this motor? Thanks again, John

 

[Jbub1968]

Re: bf40 Steam from exhaust

Also, When I did the engine flush I had the lower end removed. Covering the water tube until pressure was great and then releasing it with air going through thermostat hole. Doing the reverse of that also.