Winter Operation Using Diesel Fuels (V-B-00.00/06)

WINTER OPERATION USING DIESEL FUELS

TECHNICAL SERVICE BULLETIN

SUBJECT

MY-All, Model 906 with Engines 642 & 651 

Winter Operation Using Diesel Fuels 

Temperatures falling below 5° F may cause:

• The engine to fail to start despite the starter turning over.
• The engine to start, but it may go off again after a brief period and then will not restart.

The reason for impaired fluidity of winter-diesel fuel is the separation of paraffin crystals in the diesel fuel when the outside temperature reaches 19.4° F or lower. The paraffin crystals will then clog the fuel filter and the tank strainer. In summer diesel fuel, jellification starts at 37.4° F.

To avoid these operating faults, diesel fuels with better flow characteristics are offered for the winter months.

Fuel jellification depends on:

• Temperature
• Vehicle idle time
• Fuel grades
• Fuel tank fill levels
• Vehicle model designation (different tank systems)
• Engine variant (different fuel filters)

PROCEDURE

To fix these conditions:

• Defrost fuel in vehicle at room temperature (depending on the degree of jellification this can take up to 5 hours).
• At a fuel level < 1/2, the breakdown of the paraffin crystals can be accelerated through the addition of winter diesel fuel.
• From a technical point of view it is not necessary to replace the fuel filter.

Refer to "Winter operation with diesel fuels" WIS doc: BB00.40-P-0137-00A.