Restriction of Air Inlet and Exhaust
Akan terjadi pengurangan kinerja engine apabila terjadi hambatan di sistem pemasukan udara atau sistem gas buang.
Udara yang mengalir melalui peredam udara dapat mengalami hambatan. Hambatan dapat disebabkan oleh elemen filter bekas atau tersumbatnya elemen filter. Hambatan tidak boleh lebih dari 4,0 kPa (15 inchi H2O). Udara yang mengalir melalui peredam udara tidak boleh mengalami hambatan lebih dari 1,25 kPa (5 inchi H2O) dengan elemen filter yang baru.
Catatan: Hambatan di peredam udara merupakan perbedaan tekanan antara udara atmosfir dan udara yang telah melewati peredam udara.
Tekanan membalik di saluran gas buang tidak boleh lebih dari 2,5 kPa (10 inchi H2O).
Catatan: Tekanan membalik merupakan perbedaan tekanan antara gas buang di elbow keluar dan udara atmosfir.
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