Diesel Watch Dz7023 Manually
Most of the servicing on a diesel engine is similar to that on a petrol engine.Fitting a new oil filter and changing the engine oil is exactly the same, as is setting the valve clearances.Replacing the air filter can differ from a petrol engine depending on the design of filter fitted.The main difference lies in servicing the fuel system, particularly the fuel filter.In many ways a diesel engine is less complicated than a petrol engine, withgreater reliability and a longer working life. There is little differencebetween servicing a diesel and a petrol engine except that the diesel has noignition system to worry about. However, the fuel system needs very carefulattention, as part of the regular service, to prevent dirt and water in thefuel damaging it. Filter/water trapThe very small working clearances in diesel engine injector pumps andinjectors means it is vital that the fuel passing through the system is alwaysclean.There is always at least one filter fitted in the fuel supply line, usuallyin the engine bay. It may be mounted on the bodywork, or sometimes on a bracketattached to the cylinder head. The filter element is disposable and should bereplaced at the recommended service intervals or sooner.The fuel filter also traps any water in the fuel and you should drain it atregular service intervals, or sooner if the engine is suffering frommisfiring.
Draining waterThe fuel filter is usually fitted with a drain tap or plug to drain off thewater. First, open the vent valve on the top of the filter housing to allow thewater to drain easily. You will find it usually has a screwdriver slot in thehead.If you can't find a vent valve, there may not be one fitted, in which caseyou can create a vent by carefully undoing the uppermost fuel pipe union thatis connected to the filter casing. Hold an old jar under the drain plug or tap,then open the plug or tap and let the fuel flow out.Watch the fluid that emerges to see how much water is in it. Close the draintap or plug only when the flow has changed to pure diesel fuel.
Retighten thevent valve (or reconnect the fuel pipe). If the engine still runs badly, thenext job is to renew the fuel filter. Draining the filter. Lubricate the filter sealing ring with diesel fuel. Fuel filterWith all types of filter, start by cleaning off all traces of dirt fromaround the filter casing and housing - absolute cleanliness is essential whenworking on the fuel system.
Then drain off all the water and fuel from insidethe filter in the way described above.Some cars have a canister filter much the same as an oil filter. The filterelement is replaced complete with its casing.A second filter design has a semi-canister filter that is held between twoend plates. Find the securing nut or screw that holds the two plates together(usually in the centre of the top endplate). Hold the bottom endplate and thefilter element, undo the nut or screw and lower the endplate and element away,together with the 0-rings that seal the joins to the endplates.Fit new 0-rings to the filter element, then reassemble it to the endplates -do up the securing nut or screw tightly to prevent leaks.A third design of filter has a replaceable filter element contained in ahousing, much like the older design of oil filter.
Find the bolt or screw thatsecures the filter bowl to the filter mounting. Hold the bowl, and undo thefixing. Remove the bowl, making a note of how any sealing washers fit.Pull the old filter element from the bowl. Wipe out any dirt in the bowl,then fit the new element. Fit a new sealing 0-ring into the filter mounting,and replace the bowl, doing up the fixing bolt or screw tightly to hold itfirmly. Replaceable element. Do not forget to fit new sealing O-rings.
Bleed fuel systemFitting a new fuel filter allows air to get into the fuel system, which willprevent the engine from running properly - the same thing can also happen ifyou run out of fuel. Most engines have an automatic bleed system which gets ridof the trapped air but others have to be bled manually. However, it is often agood idea to bleed the system manually, even if it is supposed to beself-bleeding.Some systems have a hand-operated bleed pump built into the injector pump,but otherwise you have to turn the engine over on the starter to make the mainfuel pump operate.Undo the vent valve on the fuel filter housing. If there is no plug, slackenoff the top pipe union on the housing. Operate the hand bleed pump or turn theengine over on the starter (a helper may be useful) and watch the vent plug orunion.
Diesel Watch Dz7023 Manually To Iphone
Diesel Watch Dz7023 Manually Tv
You will see a mixture of fuel and air bubbles coming out.Continue pumping until the emerging diesel fuel is free of bubbles, thenclose the vent valve (or tighten the pipe union). Sometimes there is anothervalve on the injector pump that you have to bleed in the same way - ask yourdealer if your car has one.
Resetting the idling speed. Slacken off the idle screw locknut.Apart from the jobs already mentioned, the only other service job youcan do on a diesel engine is to reset the idling speed. You only need to dothis if the engine is running too slow or too fast. If it is all right,then the idling speed is best left alone.The idle speed screw is mounted on the fuel injector pump, which isusually on the side of the engine. The pump is driven from the camshaft orthe timing chain or belt.
Consult your manual to find the exact location ofthe screw as it varies from car to car. Slacken off the idle screw locknut.With the engine running, undo the locknut that secures the idle screw, then slowly adjust the screw in or out to speed up or slow downthe engine to the correct speed. Once set, hold the adjusting screw inposition while you do up the locknut. Oil and airRenewing the oil filter is identical to that on a petrol engine.
But when filling with new oil, make sure you use thecorrect grade for your car. Many diesels use a different grade of engine oil topetrol engines - check in your handbook to see the exact specificationrequired.Fitting an air filter is usually the same as on a petrol engine although some newer diesels use large air filters, housed in atwo-piece plastic casing held together by spring clips.Carefully remove the old filter, then wipe out the filter casing using adamp rag.
Take care not to let dirt drop into the engine's air intake. Fit thenew filter into the casing, then reassemble the casing halves and snap over allthe spring clips, making sure they engage properly.