Dt466 smokes terrible and I can’t figure out why.

   / Dt466 smokes terrible and I can’t figure out why. #11  
How old is the truck? White smoke can be caused by low compression, retarded timing, or low cetane fuel.

I would start by purging the fuel and installing fresh filters, especially if the truck has been sitting for a while, and running the engine on known good fuel.

The DT 466 has had at least four fuel systems over the years, the Ambac Model 100 rotary distributor pump, the Bosch MW and P Pump, the electronic HEUI, and the G2. Retarded timing or air in the fuel system will cause white smoke. Make sure there are no O ring leaks and that the return checks are functional.

A worn out power cylinder will have inadequate compression to support combustion. Hard starting is the first symptom, but white smoke follows.

Pull the valve cover and check valve lash. Worn valve train components can cause issues too.
 
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   / Dt466 smokes terrible and I can’t figure out why.
  • Thread Starter
#12  
It’s 1970s or 80s. It starts good. I guess I should finish the compression test and change the fuel first thing.
 
   / Dt466 smokes terrible and I can’t figure out why. #13  
How old is the fuel? It sounds like this thing may have been sitting a while before you bought it.
If it was last filled with biodiesel, the fuel could have deteriorated and cause white smoke.
 
   / Dt466 smokes terrible and I can’t figure out why.
  • Thread Starter
#14  
How old is the fuel? It sounds like this thing may have been sitting a while before you bought it.
If it was last filled with biodiesel, the fuel could have deteriorated and cause white smoke.

It’s sat a few years. I don’t know if the previous owner changed anything.
 
   / Dt466 smokes terrible and I can’t figure out why. #15  
Dump some sea foam in the fuel and oil. Take your time start with the simple easy things .
 

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