1. Why an orifice in scavenge drain tank? Where?
An orifice of about 10mm is present in the vent of the scavenge drain tank.
The scavenge drain tank is pressurised due to the scavenge pressure. If the vent is open, there will be a loss in scavenge pressure and also oil will ooze out causing pollution. Orifice make sure pressure is released in a controlled way.
3. Checking TDC of a unit
Turn in the engine in ahead direction to ensure that the tension of the chain on the chain drive is correct. Check that the mark on the flywheel points to the 1st unit. Now open the crankcase door of the unit one and check the crankthrow position with a pin gauge(as specified in the manual, 501mm for 6S50MC), with its one point on a mark on the frame and the other point of the pin gauge must coincide with the mark on the crankthrow. CHECKING THE CAM POSITION IS ALSO SAME BUT WITH A DIFFERENT LENGTH OF PIN GAUGE.
An orifice of about 10mm is present in the vent of the scavenge drain tank.
The scavenge drain tank is pressurised due to the scavenge pressure. If the vent is open, there will be a loss in scavenge pressure and also oil will ooze out causing pollution. Orifice make sure pressure is released in a controlled way.
3. Checking TDC of a unit
Turn in the engine in ahead direction to ensure that the tension of the chain on the chain drive is correct. Check that the mark on the flywheel points to the 1st unit. Now open the crankcase door of the unit one and check the crankthrow position with a pin gauge(as specified in the manual, 501mm for 6S50MC), with its one point on a mark on the frame and the other point of the pin gauge must coincide with the mark on the crankthrow. CHECKING THE CAM POSITION IS ALSO SAME BUT WITH A DIFFERENT LENGTH OF PIN GAUGE.
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