7. Intake and exhaust system150[NOTICE]1) When a diaphragm is damaged, pressure control inside the crankcase becomes insufficient, andtroubles occur. When the internal pressure of the crankcase decreases too much due to thedamage of a spring, much blowby gas containing oil is reduced in intake air system, and it maycause the combustion defect by the early dirt of the intake valve or the urgent rotation of the engineby the oil burning.When pressure progresses in the crank case too much due to the wrong operation of thediaphragm and so on, it is considered that oil leakage from the joint of a oil pan, a oil seal and so onwill occur. When a diaphragm is damaged, blowby is discharged from the breathing hole on theside of diaphragm cover, and not reduced in the intake manifold. Therefore, be careful of thediaphragm trouble.2) At lubricating oil replacement or lube oil supplyThe amount of lubricating oil isn't to be beyond the standard upper limit (in the engine horizontality,the upper limit mark of the dipstick). Since the blowby gas reductor is adopted, be careful that theamount of oil mist may be inducted in the combustion chamber and the oil hammer sometimes mayoccur, when the lubricating oil quantity is beyond the upper limit or an engine is operated beyondthe allowable maximum angle of an engine.[Reassembly]Replace the diaphragm with new one, when it is damaged.7.1.2 Diaphragm assy inspectionRefer to 2.2.6(5) for the inspection procedure.
