Join Date: Nov 2000
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Yanmar engine startup smoke
It could be that the bluish smoke that you are seeing is a result of some oil leakage past the valve guides or piston rings. Or, one other possibility....is your engine crankcase filled with the proper oil and viscosity for your area?
If you are not certain what kind of oil is in the engine...drain the oil and replace it and the filter with Shell Rotella T 20W50 or Chevron Delo 20W50, if you are are in the south or tropics. If you are up north use 10W40.
The bluish smoke that you are seeing is oil burn...not diesel fuel. A cold diesel puts out blackish smoke and as soon as the pistons and combustion chamber heat up the colored smoke dimishes as the diesel burns more completely. The bluish smoke dissapearing means that the lube oil in the combustion chamber is gone.
If changing the oil does not solve the problem....then it is possible that you need to have a mechanic look at it. But, if you are only getting "a little bit of blue smoke", I wouldn''t be too concerned. If its belching large clouds of blue smoke and stumbling and running erratic....thats different.