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Belarus 800 series

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morant
Join Date: Dec 2016
Posts: 3 Mississippi
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2016-12-05          195979

My tractor is smoking light blue smoke when running and popping back through the muffler every once in a while. Oil appears at the base of the muffler. I adjusted the valves by the book and it got better but still doing this.

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Belarus 800 series

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greyhorse
Join Date: Jun 2013
Posts: 65
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2017-01-19          196145

Could be pitted valves/timing..... ....

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Belarus 800 series

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Murf
Join Date: Dec 1999
Posts: 7249 Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2017-01-19          196154

Typically blue smoke in a diesel indicates unburnt oil not fuel. If the exhaust is spitting liquid of any kind that indicates something is not being burned.

If you have both blue smoke and oily stuff being spit out the exhaust that generally indicates you have motor oil making it into the cylinder. That is not good. It could indicate a bad cylinder / possibly broken piston ring.

Does the engine sound normal? Is it reaching normal running temperatures? Is it making normal power?


Best of luck. ....

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