You could have a couple cylinders damaged or possibly a warped head lettind all the compression loose through the cooling system. Can you check the pressure on the cooling system with a radiator pressurizer while cranking the engine over? If it starts building pressure immediately, the compression is going into the cooling system. otherwise it is going into the crankcase and you will need to rebuild or replace the engine at that point.
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it could be a flow sensor in the fuel line to stop the engine before air gets sucked in form low fuel or broken lines
I would first go to the tank vent and ensure that it is not blocked , restricting fuel flow to the pump
there is nothing obvious as the engine would not restart so look for the simple things that trip the stop system
if there is any electronic control , it may be a slowly overheating component that needs checking but I would leave that to a last thing to check
Excessive fuel consumption can be ...
fuel leak on to the ground.. Obvious
fuel leak into sump via fuel pump body... Check sump oil
worn piston rings... Grey Smoke
glazed cylinder walls...smoke
burnt valves... Need compressin test
faulty turbo(s)... Sound, check manifold pressures
blocked exhaust line/muffler... Smoke black
faulty thermostat so motor doesn't get up to temperature, what is motor temperature ? ... Smoke black
lack of oil, wrong grade of oil for temperature
scavenge fuel line from injectors blocked or not returning to tank
faulty injector(s) causing poor fuel spray
faulty injector(s) bleeding fuel into cylinders... Smoke black
faulty injector pump balance
faulty injector pump timing
faulty coupling between injector pumps, even can be one 180deg out of timing
bad diesel fuel
Are there mechanical losses in motor load ? Alternator fault ? or gearbox fault prop fault ?
What is the exhaust colour ? Black or grey ?
What are the inlet manifold pressures ?
Using a thermometer ( IR if available ) what are the cylinder head or exhaust manifold temperatures ? This may isolate problem to one or more cylinders.
If you can supply more information I may be able to help track down the problem.
Check de-compression lever. Motor will not start if de-compression lever is operated. The lever stops the valves from closing. If lever is operated then there will be no compression when motor is pulled over with starter cord or electric starter operated.
Check fuel cut off at injector pump is not operated. This is how motor is normally stopped.
There must be no air in the fuel line, fuel filter, injector jump or injector. Undo the fuel line at the injector and pull starter or operate electric starter. Fuel should spit out. If not, crank some more until fuel comes through.
if there is fuel in the tank, filter not blocked and injector pump working then if not fuel at injector then maybe injector pump faulty.
If fuel at injector line then remove injector, crank motor and look for spray of fuel.
If if you have checked for spray of fuel and motor compression then motor should start.
Low C can be many things, has it overheated? it can be leaking head gasket, burnt or worn out valves/guides or cracked rings. Check for smoke to help rule out the rings, short of an upper engine tear down, you won't know which, a basic leakdown test on the cylinder may help determine
How often has it run at less than 30% capacity? It maybe wetstacked see if it burns off under a laod bank first at 75% nameplate rated EKW. Then check each injector sparay pattern, sounds like an injector, or the timing is off also, since a top end was done
these engines have a mechanical injector and when water gets in them the best way to say this has larger particals then the diesel the best way is to remove the injector and the fuel lines and spray a carb cleaner in then this will dissipate the water place the injector in a pan and heat up on a stove not to get to hot this will dry out the injector then when this is done spray wd-40 in where the fuel tube supplies the fuel do not touch the tip or bump or drop striking the tip that goes in the engine you will have to replace it then reinstall all the removed parts keep the line lose at the injector crank the engine till fuel starts flowing do not hole the ling with a finger you can blow a hole and inject fuel in to your blood these pumps build a massive pressure when lines held .
when the fuel flows start to tighten the line what your doing is purging the air out as well as any water. when you get the lines to where their is a dropping of fuel the engine should start to run it will be ruff and smoke with a wrench loosen then tighten line a couple times wile it is running then snug the line the fuel in the injector will push what rest of the air out and it will smooth out . DO NOT USE STARTING FLUID ON THESE ENGINES you can crack the case they cant take the stress. i hope this helps
Hi , firstly i would do a full service on it , all filter and fluids , oil/coolant water,fuel filter(s) and air filters pay attention to any water seperators , check all fuel line connectors and unions are tight and in good order ( drawing a small amount of air into the fuel system if often the cause of ''a lack of power '') check your diesel as it absorbs moisture and can severley effect the running of an engine . if this has no effect get a rag /goggles and the right size open ended spanner and slacken each fuel injector nut whilst the engine is running , listen for the engine noise going down , if it dosent this means the injector is deffective ( might need replacing or cleaning ) do this to each injector in turn , be very careful as you do this , the diesel is at 200bar pressure and can injected you ( hence the rag ) a final one is the fuel lift pump may be deffective , they often partially work and starve the engine at maximum revs , depending on your engine this will be an electric one or driven directly from the engine block , just follow the fuel lines from your diesel tank ,. hope this helps