Fig. N.14. Complete Kit of Tools for use when cleaning and overhauling atomisers

Fig. N.15. Exploded view of Atomiser. - TM-55-1930-209-14P-9-4_738

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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FUEL SYSTEM - N.9 a higher speed than specified or severe damage to the engine may be the result. Idling Speed Setting The engine idling speed is adjusted by the idling screw (see Fig. N.13). With the engine warm, turn the screw clockwise to increase the engine speed and anti-clockwise to decrease. The idling speed may vary, depending upon the type of craft to which the engine Is fitted. For details apply to the nearest Perkins Distributor, or alternatively, Service Dept., Perkins Engines Limited, Peterborough. ATOMISERS General Each atomiser body consists of a steel body held to the cylinder head by means of a flange and two studs. The joint between the atomiser and cylinder head is made by a copper washer between the lower face of the nozzle cap and the cylinder head. When preparing to fit the atomiser into place in the cylinder head, care should be taken, that only the correct copper washer is used to make this joint. The metal of the cylinder head, the faces of the copper joint ring, and the corresponding face on the nozzle holder cap nut should be perfectly clean if a leak-proof joint is to result. It is advisable to fit a new joint washer when the atomiser is replaced after having been removed for any reason. Ensure that the old washer has been removed from atomiser or cylinder head. This joint washer should be an easy, but not loose fit for the atomiser nozzle, and it is because this is such an important feature that the washers especially made for the purpose should be used and none other. On no account should ordinary sparking plug type washers be used. The atomiser can now be fitted in place, care being taken to see that it is an easy fit in the cylinder head and on the holding-down studs, so that it can be placed down on the copper joint without force of any kind. The nuts on the flange should then be tightened down evenly in order to prevent the atomiser nozzle being canted and so "nipped" in the cylinder head. The correct tightening torque for the atomiser securing nuts is 12 lbf ft (1,7 kgf m) - 16 Nm. When fitting the leak-off pipes make sure new washers are used, and before tightening the banjo bolt make sure the washers are a good fit and are placed centrally, and remain central when tightening the bolt. MAINTENANCE The following information is given for the guidance of those who wish to carry out their own atomiser maintenance using the basic test equipment, which would include an Atomiser Testing Pump and kit of tools. (Refer Figs. N.14 and N.17). Atomisers should be taken out for examination at regular intervals. How long this interval should be is difficult to advise, because of the widely different conditions under which engines operate. When combustion conditions in the engine are good and the fuel tank and filtering system are maintained in first-class order, it is often sufficient if the atomisers are tested every 2,500 hours. It is no use taking atomisers out of attention unless the equipment described above is available, or spare atomisers are at hand for substitution. The nearer the ideal conditions of good fitting with adequate cooling and absolutely clean fuel are realized, the less attention the atomisers will need, and so the longer their efficient life. In this connection, since there is no other item of the equipment upon which the performance of an engine depends so much, it pays the user handsomely to see that the engine never runs with any of its atomisers out of order. Fig. N.14. Complete Kit of Tools for use when cleaning and overhauling atomisers.

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