Because there is much place to use the form with sealed pressure inside engine, between annulus of piston of — of piston of — of the cylinder bushing that be like steam, between axis of rotor of supercharger — supercharger, have in engine like this kind of thick front cover when making an appointment with 1/3 bear, just produce effect adequately, and bear hour appears likely slight leakage phenomenon. In because this abroad starts a mechanism,building business to use manual in its gave generally emphasize.
If aircrew moves below small negative charge, as the continuance of run time, can appear the following breakdown:
Cylinder bushing of steam of 1. piston — is sealed and bad, the change on engine oil, enter firebox combustion, exhaust risks blue smoke.
2. to diesel engine of pressure boost type, as a result of low carry, carry for nothing, pressure boost pressure is low. Bring about supercharger oil seal easily (blame contact) sealed effect drops, engine oil change enters pressure boost room, be accompanying enters cylinder into gas.
The change on 3. participates in combustion to the one part engine oil of cylinder, one part engine oil cannot burn completely, in spiracle, intake duct, piston the place such as annulus of top, piston forms carbon deposit, still one part follows exhaust eduction. Such, engine oil can build up stage by stage inside exhaust duct of steam cylinder bushing, also can form carbon deposit.
Accumulation of indoor engine oil goes to the pressure boost of 4. supercharger certain level, with respect to the meeting union from supercharger the face is in ooze leakage.
Long-term small negative charge runs 5. , will more serious bring about athletic component to wear away aggravate, the aggravation of engine combustion environment consequence that causes overhaul period to shift to an earlier date.
Accordingly, foreign diesel engine is made no matter the manufacturer is inspiratory to nature model still add those who press type to use emphasize should decreasing as far as possible low carry / empty running time, set the smallest negative charge cannot the 25%—30% under aircrew rated power.
