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I obviously am not familiar with the application here but petrol engines have an electrical ignition system that can simply be turned off to stop the engine. However diesels have super high compression that causes the ignition. Diesels with mechanical fuel systems will continue running until the fuel is shut off or the engine is stalled. The fuel is usually supplied to the injector pump through a solonoid valve where an electrical supply is needed to open the valve and the valve springs shut when the supply is removed. The fault is 90% in my mind associated with the this fuel shut off valve. However there is another way that a diesel engine can find fuel to not allow it to stop. A turbo seal failure can atomise engine oil into the inlet manifold and the engine will continue running until all the is used up.
key stop diesel engines normally have a fuel shut off solenoid on the fuel pump check it for correct operation
check for a blown fuse that is stopping it from working
iam assuming its a diesel as most of these are ,its a VW although its badged as every other make mine is a ford galaxy and its a brilliant motor.Right firstly change the oil and use a 10/40 then if problem persists change the starter motor as the coils in it could be throughing up a high resistance ,this often happens on diesels as no one has the patience to wait for the heater light to go out ,also remove the heater glow plugs and check they all work,and never ever repeat never ever crank engine for more than 15 seconds always stop and repeat the heater light sequence ,also it does help if you fit a non return valve into the feed and return pipe to stop the fuel from running back to the tank as the valves in the injector pump do go weak and allow the fuel to run back to the tank overnight .
A slow shutting of the clutch ist somewhat normal if you jumpstart the Smart 450. But it could be improved by teach in the clutch or replacing a weared down clutch or a stucking actuator. Another possible improvement is replacement of the front motor bearing. In this case build in the stronger bearing of the diesel engine.
battery not charging and now its flat ,put battery on charge and see what happens ,a diesel needs a lot of power to crank owing to the high comperssion of the engine ,well it is a compression ignition defined engine so charge battery and see what happens ,leave it on charge for at least 24 hrs and then try it or it could be the starter motor but i suspect the battery first as its also the easiest to change
the service and repair manual will guide you with diagram to locate and fix the problem by you own the original factory you will get from the given link http://toolsnyou.com/
If so (and i think it is from the fault) then its a sticking fuel solenoid, this cuts the fuel supply when the engine is switched off as diesels need no electricity to run so its a strangler type device to choke the engine by stopping the fuel, they can stick in the on position and the engine will not stop with the key.
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