Source of vibration/smoke

[overdrivegear]

I just recently put on rebuilt injector pump, got it timed to spec, and all that good stuff but there seems to be a problem with white smoke generation and engine vibration.
As far as smoke goes, the white color means unburned fuel.  There isn't any steam to suggest a bad head gasket.  I took the injectors apart and cleaned them.  The smoke is very thick when the motor is cold, but once it reaches operating temp, smoke is less but still un-natural.
The vibration may be associated with the fuel issue, but I'm not sure.  I checked all the valve clearances and they're pretty bad...each clearance is roughly 5-6 thousandths tight (if it's of any consolation).
  Are these common problems and if so, what should I be checking to remedy these issues?[/code]

[rabbitman]

does it run better if you pull the cold start lever? I would say recheck the timing 'cause it sounds like it's injecting to late.

[jtanguay]

you could try to troubleshoot the injectors if it sounds like it is missing.  just crack each injector line one by one.  the motor should grumble at you and a stream of diesel should leak out.  if the motor doesn't grumble, then its most likely that injector that is the culprit.  (you may need sensitive ears to detect it from all the other engine noise)

however, chances are the timing is just out.  :wink:

[burn_your_money]

tight valves will lower your compression and can cause white smoke.
I'd bet timing though