OPERATING MANUAL FOR BUKH DV24RME LIFEBOAT ENGINES
009W4826-R11 - 15 -
IRREGULAR OPERATION - CAUSES AND REMEDIES
1. Engine does not start
SYMPTOM CAUSE REMEDY
Insufficient or very little compression Inlet and/or exhaust valves leaking Grind or replace the valves, mill the seats
Inlet and/or exhaust valves sticking
Grease valve stems with 2/3 gas oil and 1/3 lub.
Oil. If necessary clean the valves.
Insufficient rocker arm clearance
Adjust to 0.25 mm inlet and 0.3 mm exhaust
when engine is cold (turn left)
Piston rings stuck in grooves or are worn Replace piston rings
Valve springs broken or are weak Replace springs
Insufficient or no pressure from fuel pump Air in fuel system or nozzles sticking Bleed or renew nozzles
Thermo start out of order No fuel (valve leaking) Fill up (renew thermo-start)
Electric supply out of order
Check and/or replace switch and connections.
Chech fuse
Engine does not reach normal revs Unloaded battery or defective Battery to be charged or renewed
Starter motor turns engine too slowly Loose or corroded connections Tighten or clean connections
2. The engine starts, but stops soon after
The engine starts, but stops soon after Empty fuel tank Refill and bleed
Air in fuel system Bleed
Nozzle sticking Replace nozzle
Fuel filter choked Replace filter element. Clean the tank
3. The engine does not reach maximum output
Difficult to start None or insufficient compression See ”engine does not start”
The engine revs. Is reduced considerably
when loaded
Fuel supply choked up.
Air/water in fuel system
Check fuel system thoroughly
Governor incorrectly adjusted or something
in the system works sluggishly
Adjust the governor. Check governor system and
correct the error
Hot engine(smell of heat) Insufficient cooling water supply Stop engine. Check cooling water pump
Damaged cylinder liner or bearings Check bearings, piston and cylinder, if
necessary replace them
4. The engine knocks
The engine runs unevenly Air/water in fuel system Bleed see ”engine does not start”
5. The engine smokes
Black smoke Air inlet filter choked Clean filter
Insufficient compression See ”engine does not start”
Blue smoke The lube oil passes piston and oil rings an
penetrates into combustion chamber, or
vacuum valve defective
Replace oil rings and possibly the piston rings.
Clean vacuum valve
Grey smoke Thermostart valve is leaking Replace
6. Excessive consumption of lubricating oil
Blue smoke Oil- and piston rings are worn Replace oil- and piston rings, if required
Piston and cylinder liner highly worn Replace
Defective vacuum valve Replace
Lub. oil leaks out of crankshaft bearings Worn oil seal ring Replace
7. The engine gets too warm or too cold
Cooling water temperature too high
(smell of heat)
Unsufficient cooling water supply caused
by:defective water pump, choked strainer or
a defective thermostat
Investigate pump rotor for broken wings or lost
driver screw. Clean strainer. Clean or replace
thermostat
Cooling water temperature too low Defective thermostat Clean or replace thermostat
8. Insufficient or no lubrication oil pressure
Oil warning lamp lights up. Oil pressure
gauge indicates abnormally low oil pressure
Insufficient lube oil in the engine Check and refill
Leakage in lube oil system Tighten and refill
Relief valve sticking or spring too weak Clean bore and valve, stretch or replace the
spring
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