in the crankcase
20. Engine does not stop although stop lever is set in stop position or remote stop signal is given
a) Injection pump control rack wrongly set (3b, c)
Block fuel supply as near the engine as possible (e.g. by fuel filter three-way cock). Before restarting the engine, the fault must be located and corrected. Great risk of
overspeed.
b) Faulty stop automation. Stop by means of stop lever 23.2.3
c) The engine driven by generator or propeller or by another engine connected to same reduction gear
21. Engine overspeeds and does not stop although overspeed trip device trips
a) Injection pump control rack wrongly set (3b,c). Load the engine, if possible. Block fuel supply, e.g. by means of fuel filter three-way cock.
b) An overspeeding engine is hard to stop. Therefore, check regularly the adjustment of the control mechanism (the injection pump rack positions):
1) the stop lever being in stop position or the overspeed trip device being tripped and the speed governor at max. fuel admission
2) the stop lever and the overspeed trip being in work position and the speed governor in stop position.
This control should be done always when the control mechanism or the injection pumps have been touched.
08.2
Emergency operation
08.2.1 Operation with defective air cooler(s)
If the water tubes of an air cooler are defective, the cooling water may enter the cylinders. If water or water mist flows out of the drain pipe at the bottom of the cooler housing, check whether it is raw water or condensate. If condensate, reduce cooling (see chapter 03, Fig 03-2). If raw water, stop the engine as soon as possible and fit a spare cooler.
If no spare cooler is available, the following can be done as an emergency solution:
a) If there is not time enough to remove the defective cooler
and repair it, shut off water supply and return pipes.
b) Operating with a partially plugged, shut-down or removed air
cooler. Engine output must be limited so that the normal full
load exhaust temperatures are not exceeded. The turbocharger may surge before the admissible exhaust temperatures are reached. In such a case, engine load must be reduced further to avoid continuous surging.
08.2.2 Operation with defective turbocharger(s)
A defective turbocharger is to be treated in accordance with the service instructions given in the turbocharger instruction book (blocking of rotor, blanking of turbocharger etc.). See chapter 15, section 15.4.
08.2.3 Operation with defective cams
If the camshaft piece with damaged cams cannot be removed and replaced by a new one, the engine can be kept running by the following measures:
a) Injection pump cams:
Lock the injection pump tappet in upper position by a locking plate 800066 included in the tool set.
Attention! Concerning torsional vibrations and other vibrations, see sec.
08.2.5.
When operating with a shut-off injection pump over a long period, the valve push rods of the inlet and outlet valves are to be removed, and the indicator valve on the respective cylinder is to be opened once an hour to allow any accumulated oil to escape. With one cylinder out of operation, reduce load to prevent exhaust temperature of the remaining cylinders from exceeding normal full load temperatures.
b) Valve cams
Stop fuel injection to the cylinder concerned, see chapter 16. Remove the valve push rods and hang up the tappet in upper position by locking pins 800067 included in the tool set. Mount the tubes covering the push rods.
Warning! Note with locked tappet in upper position should the push rods
be removed otherwise will the piston contact with the valves.
Attention! Concerning torsional vibrations and other vibrations, see sec.
08.2.5.
With one cylinder out of operation, reduce load to prevent exhaust temperatures of the remaining cylinders from exceeding full load temperatures.
08.2.4 Operation with removed piston and con-
necting rod
If damage on piston, connecting rod or big end bearing cannot be repaired, the following can be done to allow emergency operation:
1 Remove the piston and the connecting rod.
2 Cover lubricating oil bore in crank pin with a suitable
hose clip, and secure.
3 Fit completely assembled cylinder head but omit valve
push rods.
4 Prevent starting air entry to the cylinder head by re-
moving pilot air pipe.
5 Hang up the injection pump tappet and valve tappets
as described in section 08.2.3.
Attention! Concerning torsional vibrations and other vibrations, see sec.
08.2.5.
With one cylinder out of operation, reduce load to prevent exhaust temperature of the remaining cylinders from exceeding normal full load temperatures.
If the turbocharger(s) surges, reduce load further to avoid con- tinuous surging.
Operation with removed piston and connecting rod, from one or more cylinders, should be performed only in absolute emergency conditions when there are no other means of proceeding under own power.
08.2.5 Torsional vibrations and other vibrations
When running the engine with one cylinder, or more, out of operation, the balance of the engine is disturbed and severe, or even dangerous, vibrations may occur. The vibration conditions are, in practice, dependent on the type of the installation.
As a general advice, when there are cylinders out of order: