Index |
Trouble Tracing |
503 |
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Page 1 (1) |
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L23/30H
Description |
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Starting Failures ............................................................................................................... |
503.01 (01H) |
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Faults in Fuel Oil System ................................................................................................. |
503.02 |
(01H) |
Disturbances during Running ........................................................................................... |
503.03 (01H) |
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Ignition in Crankcase ........................................................................................................ |
503.04 |
(01H) |
Trouble Shooting Guide for Centrifugal By-pass Filter ..................................................... |
503.05 (01H) |
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Trouble Shooting Guide for Turbine Starter ..................................................................... |
503.06 |
(01H) |
Trouble Shooting for Cooling Water System .................................................................... |
503.09 (01H) |
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Trouble Shooting for Lubricating Oil Cooler ..................................................................... |
503.10 |
(01H) |
Working Card
Plates
08028-0D/H5250/94.08.12
96.03 - ES0U
Description |
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Starting Failures |
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503.01 |
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Page 1 (1) |
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Edition 01H |
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L23/30H |
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Trouble |
Possible Cause |
Trouble Shooting |
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Engine turns as soon as shut-off |
Faults in electrical system. |
Check electrical parts. |
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valve is opened, without start |
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but-ton being activated. |
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Engine does not turn when start |
Air pressure in starting air |
Start compressors, re-charge air |
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button is activated. |
receiver too low. |
receiver. |
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Main valve(s) closed. |
Open valve at receiver and stop |
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valve interposed in line between |
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receiver and engine. |
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Pinion does not engage with the |
Check the air starter for broken |
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flywheel. |
clutch jaws or other broken |
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parts. |
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Air motor runs, pinion engages |
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but does not rotate. |
Check the air motor for broken |
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shafting, bearing or clutch jaws. |
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Faults in electrical system. |
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Check electrical parts. |
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Engine turns too slowly or |
Worn air motor parts. |
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irregularly when start button is |
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Remove and disassemble the air |
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depressed. |
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motor. Examine all parts and re- |
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place any that are worn or |
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damag-ed. Use the guidelines for |
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determi-ning unserviceable parts. |
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Start valve is sticking in close |
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position. |
Check start valve. |
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08028-0D/H5250/94.08.12
96.02 - ES0U-G
Description |
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Starting Failures |
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503.01 |
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Page 1 (1) |
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Edition 02H |
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General |
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Trouble |
Possible cause |
Troubleshooting |
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Engine turns as soon as shut- |
Faults in electrical system. |
Check electrical parts. |
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off valve is opened, without |
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start button being activated. |
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Engine does not turn when start |
Air pressure in starting air re- |
Start compressors, re-charge |
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button is activated. |
ceiver too low. |
air receiver. |
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Main valve(s) closed. |
Open valve at receiver and |
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stop valve interposed in line |
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between receiver and engine. |
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Pinion does not engage with |
Check the air starter. |
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the flywheel. |
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Air motor runs, pinion engages |
Check the air motor for broken |
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but does not rotate. |
shafting, bearing or clutch jaws, |
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see Working Card 513-01.30. |
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Faults in electrical system. |
Check electrical parts. |
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Engine turns too slowly or |
Worn air motor parts. |
Remove and disassemble the |
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irregularly when start button is |
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air motor. Examine all parts |
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depressed. |
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and replace any that are worn |
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or damaged. Use the guide- |
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lines for determining unserv- |
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iceable parts, see Working |
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Card 513-01.30. |
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Start valve is sticking in closed |
Check start valve. |
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position. |
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Low air pressure. |
Raise the air receiver pres- |
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sure. |
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Air starter works, but the drive |
Clutch or drive shaft broken. |
Dismantle the air starter and |
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shaft does not rotate. |
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repair it. |
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08028-0D/H5250/94.08.12
00.12 - ES0
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Description |
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Faults in Fuel Oil System |
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503.02 |
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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 |
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Trouble Shooting |
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Engine turns on starting air, but |
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Sluggish movement of manoeuvering |
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Lubricate and mobilize rod con- |
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ignition fails. Fuel pumps are not |
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gear. |
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nections in manoeuvering gear. |
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actuated. |
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Governor setting incorrect. |
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Adjust governor, see special in- |
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struction manual. |
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Overspeed stop tripped. |
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Cancel overspeed stop. |
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Piston in stop cylinder is actuated. |
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Check that piston is not sticking. |
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Check that pressure in cylinder is |
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relieved. Check that the overspeed |
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trip is not actuated. |
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Piston in stop cylinder is actuated |
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Check pressures and tempera- |
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owing to uncancelled shutdown |
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tures. Check for faults in shut- |
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function (1). |
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down devices. |
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Failures in governor. |
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Check that governor is working |
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properly. For further fault location, |
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see special instr. manual. |
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Incorrect adjustment of manoeuve- |
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Check rod connec. Check that fuel |
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ring gear. |
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pump index is corresponding to |
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"Adjustments after trials" in testbed |
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chart. |
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Incorrect adjustment of limiter |
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Adjust setting of limiter cylinder. |
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cylinder. |
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Engine turns on starting air, but no |
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fuel is injected owing to failures in |
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Fuel oil service tank empty. |
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Pump oil into the tank. |
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fuel system. |
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Air in fuel pumps and fuel injection |
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Vent the fuel pumps with fuel with- |
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valves (2). |
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out air bubbles appears. If ignition |
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fails in just one cyl., vent the re- |
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spective fuel injection valve. If igni- |
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tion still fails, install a spare valve |
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before attempting to start the engi- |
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ne again. |
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0D/H5250/94.08.12-08028 |
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Worn-out fuel pump. |
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Change fuel pumps. |
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Defective fuel injection valves or |
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Change defective fuel valves. |
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valve nozzles (4). |
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Too low pressure before fuel injection |
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Increase the fuel oil feed pump |
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pumps (3). |
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pressure. |
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Engine turns on starting air, fuel is |
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injected, but ignition fails. |
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Water in the fuel. |
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Drain off water and repeat venting |
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of fuel pumps. |
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Fuel valves or nozzles defective (4). |
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Change defective fuel valves, |
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see Working Card 514-01.10. |
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Cont. |
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96.37 - ES0U-G
503.02 |
Faults in Fuel Oil System |
Description |
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Edition 01H |
Page 2 (3) |
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L23/30H
Trouble |
Possible Cause |
Trouble Shooting |
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Check intake and exhaust valve |
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Compression during start too low (5). |
for tight closing. Check cyl. wear |
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and piston rings. |
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Check fuel pump timing advance, |
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Incorrect timing of camshaft (6). |
and fuel valve opening pressure as |
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well as camshaft adjustment. |
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First ignitions are too violent |
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Slow turning with open indicator |
(safety valves are opening). |
Oil has collected on piston crown (7). |
valves. To locate defective fuel |
Engine runs erratically. |
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val-ve, remove oil. |
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Lubricate and mobilize rod |
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Sluggish movement of manoeuvering |
connections and bearings in |
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gear. |
manoeuvering gear. |
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Check rod connection is manoeu- |
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Fuel pump index too high. |
vering gear. Check that governor |
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is working properly. Limiter |
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cylinder to be set lower. |
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Remarks
1)If the shutdown function is due to overspeed, the shutdown impulse is cancelled by setting the overspeed governor and thus venting the stop cylinder.
2)Whenever air is present in the fuel oil system repeat venting of fuel pumps. The cause may be that a fuel valve is kept in open position (spindle sticking or spring broken). Heating of fuel to a too high temperature may have a similar effect owing to formation of gas in the fuel. If a sticking valve is found, it should be changed and overhauled. It should be cheked that no oil has collected on the piston crown. Air in the fuel oil system may also be the result of the fuel oil feed pump suckingin air through a defective stuffing box or a leaky seal.
3)If the fuel oil pressure drops, the filter may be clogged up, or the by-pass at the feed pump may have opened.
4)If the fuel is forced into the cylinder through a defective fuel valve or through worn-out atomizer holes, no or too sluggish atomization may prevent ignition, possibly followed by too violent ignition.
5)To obtain ignition temperature in the cylinders, the compression pressure during starting should be normal, see the testbed report. This can be checked by measuring the compression pressure during starting. Cylinders having too low compression should be inspected.
6)Major alterations of the combustion characteristics of the fuel may demand adjustment of the timing of the fuel pumps. One or more camshaft sections may be incorrectly fitted (after dismantling). Too high opening pressure of the fuel valves will also delay the injection.
08028-0D/H5250/94.08.12
96.37 - ES0U-G
Description |
Faults in Fuel Oil System |
503.02 |
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Page 3 (3) |
Edition 01H |
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L23/30H |
7) Oil on the piston crown will in most cases have leaked down from a defective fuel valve. As these oil accumulations are dangerous, the leakage should be found and remedied before the engine is started again.
Turbocharger Failure
If heavy vibrations, bearing failure or other trouble arise in a turbocharger, the engine load must be reduced until the vibrations cease. When possible, the engine is stopped in order to locate and remedy the fault (see turbocharger instr. manual).
If a repair cannot be made on the spot, it is decided if running may continue, with or without the defective charger blanked off.
When continuing the running with the turbocharger out of operation, the engine output must be reduced. The exhaust temperature must not exceed the normal valve, for full load running with an intact turbocharger. For further details see the separate turbocharger instr. manual.
08028-0D/H5250/94.08.12
96.27- ES0U-G