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Description |
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Disturbances during Running |
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503.03 |
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Page 1 (3) |
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Edition 01H |
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L23/30H |
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Trouble |
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Possible Cause |
Trouble Shooting |
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Exhaust temperature(s) |
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(All cyls.) Increased charging air |
See Working Card 512-01.00. |
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increase(s) |
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temperature due to ineffective air |
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coolers. |
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Reduce load and water-wash tur- |
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(All cyls.) Fouling or air and gas |
bine. Clean air filters and coolers. |
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passages. |
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(All cyls.) Insufficient cleaning of |
See Description 504.25. |
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fuel oil or changed combustion |
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characteristics. |
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Check Pmax. Check camshaft ad- |
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(All cyls.) Wrong position of cam- |
justment. |
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shaft (maladjustment). |
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(single cyls.) Fuel valve or valve |
See Working Card 514-01.10. |
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nozzle defective. |
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(Single cyls.) Leaky exhaust |
Check the valve clearance. Repla- |
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valves (1). |
ce cyl. head with defective valve. |
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(Single cyls.) Blow-byleaky com- |
See Working Card 506-01.00. |
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bustion chamber (2). |
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(Single cyls.) Damaged fuel pump |
Replace the single camshaft |
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cam. |
section. |
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Exhaust temperature(s) |
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(All cyls.) Decreased charging air |
Check that thermostatic valve (by- |
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decrease(s) |
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temperature. |
pass valve) in cold water system is |
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working properly and correctly set. |
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(Single cyls.) Air in fuel pump(s) |
Venting of fuel pump(s) until fuel |
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and fuel injection valve(s). |
without air bubbles appears. |
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Check feed pump pressure. |
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(Single cyls.) Spindle in fuel valve |
Change and overhaul defective |
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sticking (3). |
fuel valve. |
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(Single cyls.) Fuel pump plunger |
Change fuel pump plunger/barrel |
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sticking or leaking. |
assembly. |
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0D/H5250/94.08.12-08028 |
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Engine RPM decreases |
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Pressure before fuel pumps too |
Raise fuel oil feed pump pressure |
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low. |
to normal. Check filter. |
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Fuel valve or fuel pump defective. |
Change defective valve or pump. |
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Water in the fuel. |
Drain off water and vent the fuel |
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pumps. |
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Governor defective (4). |
Replace defective governor. |
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Increased internal friction in engine |
See "Ignition in Crankcase". |
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(5). |
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Cont. |
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96.37 - ES0U-G
503.03 |
Disturbances during Running |
Description |
Edition 01H |
Page 2 (3) |
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L23/30H |
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Trouble |
Possible Cause |
Trouble Shooting |
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Engine stops. |
Shutdown. |
Check pressure and temperatures. |
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If OK, check for faults in shutdown |
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devices. See also Starting Failures. |
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Smoky exhaust. |
Turbine RPM lagging behind en- |
Reasonably smoke is normal when |
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gine RPM. |
RPM increases; no measures cal- |
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led for. If smoky exhaust during |
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normal running, clean turbine(s) and |
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check valves. |
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Air supply too low. |
Fouling of air and gas passages, |
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see section 512. |
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Fuel valves or nozzles defective. |
See Working Card 514-01.10. |
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"Trumpets" at nozzle holes. Failure |
Overhaul fuel valves. |
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of cooling (especially during hea- |
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vy-oil operation) (6). |
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Exhaust valve knocking. |
Adjusting screw for valve setting |
Inspect and replace defective parts |
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loose. Push rod thrust disc da- |
as necessary. |
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maged. |
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Rising cooling water temperature. |
Pump stopped. Increased friction |
Stop the engine. Check the cooling |
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(7). |
water. Find cause of increased |
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friction and remedy fault. |
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Lubricating oil pressure fails. |
Lubricating oil pump defective. |
Stop the engine. For further details, |
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Filters/cooler fouled. |
see "Ignition in crankcase". See |
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also Working Card 515-01.00 for |
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lub. oil pump and Working Card |
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515-01.10 for the lub. oil filter |
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Remarks
1) This manifests itself by the exhaust temperature rising and falling of the compression and maximum combustion pressure of the respective cylinder dropping.
To limit the damage to the valves these should be changed immediately, if possible, or the fuel pump of the cylinder concerned should be put out of operation by moving the index to stop and locking it in this position.
2) Blow-by means a serious danger of piston seizure, and the engine must, if possible, be stopped and the piston in question pulled. If this is not possible, the fuel pump index must, as described above, be moved to stop. Leaky piston rings will normally result in a heavy excess pressure in the crankcase.
08028-0D/H5250/94.08.12
96.37 - ES0U-G
Description |
Disturbances during Running |
503.03 |
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Page 3 (3) |
Edition 01H |
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L23/30H |
3)If this happens the fuel pump barrel and plunger must be changed, and if, it is necessary to increase the fuel pump index by more than 10 index degrees, to obtain full load of the respective cylinder, the fuel pump is worn out in most cases. Usually this is confirmed by inspection of the fuel pump plunger on which the helical cut-off edge will show a pitted and corroded area where material is plucked out. In that case the pump can be provided with a new barrel and plunger.
4)The governor will not reduce the fuel pump delivery to zero in case of, for instance, failure of the governor oil pump, but the engine speed will start fluctuating.
When the governor is defective the engine is protected against racing by the overspeed trip, i.e. the engine is stopped automatically in case of excessive speed. It is therefore, essential, that the overspeed trip is kept in perfect order. Regarding governor failure, see special instruction book.
5) Usually a bearing failure will not slow down the engine appreciably, but the seizure of a piston in the cylinder liner might do so. Repair is necessary before starting the engine again. Feelover and look out for oil mist.
6)If the cooling water temperature for the entire engine has risen to 90-100° C, it should be checked whether steam has developed by opening the test cocks, if fitted on the discharge from cylinders. If this is the case, there is no water on the cooling surfaces, which may therefore be heated unduly. To avoid heat stresses arising in cylinder liners and cylinder heads, if the water returns too early, the engine should be stopped and left to cool, while the discharge valve is closed. After 15 minutes it is opened a little to allow the water to rise slowly in the cooling jackets. Check filling at test cocks. Make crankcase inspection to ascertain that internal water leakage has not arisen. Remember slow turning with open indicator valves at subsequent starting-up.
7)If the lubricating oil pressure drops below the minimum mentioned in "Data" find the cause of the pressure drop and remedy the defect before restarting the engine. Feel over 5-15-30 minutes after starting, and again when full load is obtained. See section 502.
08028-0D/H5250/94.08.12
96.37 - ES0U-G
Description
Page 1 (3)
Disturbances during Running |
503.03 |
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Edition 01 H |
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|
L23/30H |
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Trouble |
Possible Cause |
Trouble Shooting |
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|||
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Exhaust temperature(s) |
(All cyls.) Increased charging air |
See section 501; Operational Observat- |
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Increase (s) |
temperature due to ineffective air coolers. |
ions, item e. |
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(All cyls.) Fouling or air and gas passages. |
Reduce load and water-wash turbine. |
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Clean air filters and coolers. |
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(All cyls.) Insufficient cleaning of fuel oil or |
See section 501; Operational Observat- |
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changed combustion characteristics. |
ions, item c. |
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(All cyls.) Wrong position of camshaft |
Check Pmax. Check camshaft adjustment. |
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(maladjustment). |
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(single cyls.) Fuel valve or valve nozzle |
See section 501; Operational Observat- |
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defective. |
ions. |
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(Single cyls.) Leaky exhaust valves (1). |
Check the valve clearance. Replace cyl. |
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head with defective valve. |
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(Single cyls.) Blow-byleaky combustion |
See section 501; Operational Observat- |
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chamber (2). |
ions. |
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(Single cyls.) Damaged fuel pump cam. |
Replace the single camshaft section. |
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Exhaust temperature(s) |
(All cyls.) Decreased charging air |
Check that thermostatic valve (bypass |
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decrease(s) |
temperature. |
valve) in cold water system is working |
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properly and correctly set. |
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(Single cyls.) Air in fuel pump(s) and fuel |
Venting of fuel pump(s) until fuel without air |
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injection valve(s). |
bubbles appears. |
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Check feed pump pressure. |
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(Single cyls.) Spindle in fuel valve sticking |
Change and overhaul defective fuel valve. |
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(3). |
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(Single cyls.) Fuel pump plunger sticking or |
Change |
fuel |
pump |
plunger/barrel |
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leaking. |
assembly. |
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Engine RPM decreases |
Pressure before fuel pumps too low. |
Raise fuel oil feed pump pressure to |
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normal. Check filter. |
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Fuel valve or fuel pump defective. |
Change defective valve or pump. |
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Water in the fuel. |
Drain off water and vent the fuel pumps. |
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0D/H5250/94.08.12-08028 |
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Governor detective (4). |
Replace detective governor. |
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Increased internal friction in engine (5). |
See "Ignition in Crankcase". |
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Cont |
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96.02-ES0U-G
503.03 |
Disturbances during Running |
Description |
Page 2 (3) |
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Edition 01 H |
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L23/30H |
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Trouble |
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Possible Cause |
Trouble Shooting |
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Engine stops. |
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Shutdown. |
Check pressure and temperatures. |
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If OK, check for faults in shutdown |
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devices. See also Starting Failures. |
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Smoky exhaust. |
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Turbine RPM lagging behind engine |
Reasonably smoke is normal when RPM |
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RPM. |
increases; no measures called for. If |
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smoky exhaust during normal running, |
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dean turbine(s) and check valves. |
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Air supply too low. |
Fouling of air and gas passages, see |
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section 501;Operational Observations. |
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Fuel valves or nozzles defective. |
See section 501; Operation Observations. |
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"Trumpets" at nozzle holes. Failure of |
Overhaul fuel valves. |
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cooling (especially during heavy-oil |
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operation) (6). |
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Exhaust valve knocking. |
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Adjusting screw for valve setting loose. |
Inspect and replace defective parts as |
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Push rod thrust disc damaged. |
necessary. |
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Rising |
cooling |
water |
Pump stopped. Increased friction (7). |
Stop the engine. Check the cooling water. |
temperature. |
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Find cause Of Increased friction and |
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remedy fault. |
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Lubricating oil pressure fails. |
Lubricating oil pump defective. (8) |
Stop the engine. For further details, see |
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Filters/cooler fouled. |
"Ignition in crankcase". |
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Remarks
1) This manifests itself by the exhaust temperature rising and falling of the compression and maximum combustion pressure of the respective cylinder dropping.
To limit the damage to the valves these should be changed immediately, if possible, or the fuel pump of the cylinder concerned should be put out of operation by moving the index to stop and locking it in this position.
2) Blow-by means a serious danger of piston seizure, and the engine must, if possible, be stopped and the piston in question pulled. If this is not possible, the fuel pump index must, as described above, be moved to stop. Leaky piston rings will normally result in a heavy excess pressure in the crankcase.
08028-0D/H5250/94.08.12
96.02-ES0U-G
Description
Page 3 (3)
Disturbances during Running |
503.03 |
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Edition 01 H |
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L23/30H
3)If this happens the fuel pump barrel and plunger must be changed, and if, it is necessary to increase the fuel pump index by more than 10 index degrees, to obtain full load of the respective cylinder, the fuel pump is worn out in most cases. Usually this is confirmed by inspection of the fuel pump plunger on which the helical cut-off edge will show a pitted and corroded area where material is plucked out. In that case the pump can be provided with a new barrel and plunger.
4)The governor will not reduce the fuel pump delivery to zero in case of, for instance, failure of the governor oil pump, but the engine speed will start fluctuating.
When the governor is defective the engine is protected against racing by the overspeed trip, i.e. the engine is stopped automatically in case of excessive speed. It is therefore, essential, that the overspeed trip is kept in perfect order. Regarding governor failure, see special instruction book.
5) Usually a bearing failure will not slow down the engine appreciably, but the seizure of a piston in the cylinder liner might do so. Repair is necessary before starting the engine again. Feelover and look out for oil mist.
6)If the cooling water temperature for the entire engine has risen to 90-100° C, it should be checked whether steam has developed by opening the test cocks, if fitted on the discharge from cylinders. If this is the case, there is no water on the cooling surfaces, which may therefore be heated unduly. To avoid heat stresses arising in cylinder liners and cylinder heads, if the water returns too early, the engine should be stopped and left to cool, while the discharge valve is closed. After 15 minutes it is opened a little to allow the water to rise slowly in the cooling jackets. Check filling attest cocks. Make crankcase inspection to ascertain that internal water leakage has not arisen. Remember slow turning with open indicator valves at subsequent starting-up.
7)If the lubricating oil pressure drops below the minimum mentioned in "Data" find the cause of the pressure drop and remedy the defect before restarting the engine. Feel over 5-15-30 minutes after starting, and again when full load is obtained. See section 502.
08028-0D/H5250/94.08.12
96.02-ES0U-G