MWM MS 3.9L, Operation And Maintenance Manual, Page: 47 / 53

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NP 085.70.69 - 01/06
Influence of altitude in engine performance
When naturally aspirated engines are used at high altitude locations, the atmospheric air rarefaction will affect their
performance. The quantity of air decreases, while fuel delivery remains the same, making the air-fuel mixture richer and
lowering its power due to the incomplete combustion.
In this case, it is necessary to decrease the amount of fuel delivered to combustion chamber.
Note: Any adjustment or fuel injection pump setting must be done at the pump manufacturer Distributor..
Any other information can be requested to Service and Marketing Department of MWM-International Motores Ltda. São
Bernardo do Campo, SP, Brazil, or any representative of our Dealers and / or Authorized Service Network.