03-27-2013, 07:09 PM
Generally:
Blue smoke = crankcase oil burning (leaking past piston rings or from valve stem seals etc) . However blue/gray smoke on start-up is normal and is caused by an incomplete burning of fuel due to low combustion temps.
Black smoke = overfueling
White smoke = underfueling (fuel injector plugged etc.) or more likely coolant entering combustion chamber due to head gasket leak etc.
Watch a few you tube videos of diesel tractor/truck pulls to see the difference in smoke. Here is an example of underfueling initially then becoming overfueled.
http://www.youtube.com/watch?NR=1&v=cpNt...ature=fvwp
It gets way more complicated when you add turbo-boost pressure/air/fuel mixture and fuel quality to the equation. I dont mean to over-complicate it ....because it is complicated. There are a few guys here at Newellgurus who have more knowledge than me so I would yield to any corrections they might feel necessary to add!!
In summary, it would be normal for that 903 to smoke a bit on start-up then clear up until the accelerator is depressed. Then you will probably see some black smoke until the engine reaches the requested rpm.
Blue smoke = crankcase oil burning (leaking past piston rings or from valve stem seals etc) . However blue/gray smoke on start-up is normal and is caused by an incomplete burning of fuel due to low combustion temps.
Black smoke = overfueling
White smoke = underfueling (fuel injector plugged etc.) or more likely coolant entering combustion chamber due to head gasket leak etc.
Watch a few you tube videos of diesel tractor/truck pulls to see the difference in smoke. Here is an example of underfueling initially then becoming overfueled.
http://www.youtube.com/watch?NR=1&v=cpNt...ature=fvwp
It gets way more complicated when you add turbo-boost pressure/air/fuel mixture and fuel quality to the equation. I dont mean to over-complicate it ....because it is complicated. There are a few guys here at Newellgurus who have more knowledge than me so I would yield to any corrections they might feel necessary to add!!
In summary, it would be normal for that 903 to smoke a bit on start-up then clear up until the accelerator is depressed. Then you will probably see some black smoke until the engine reaches the requested rpm.
1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '23 Grand Cherokee.