Fuel delivery of fuel injection pump not all reason and adjust

Pump of fuel injection of 　 of B of code of 11 document label is the important part of system of supply of diesel engine fuel, use in machine of the outfit after fuel delivery is being adjusted on testing stand commonly, even if also can appear sometimes so power inadequacy, exhaust risks the unusual situation with black smoke, flabby rotate speed. Basically be the fuel delivery that debugs as a result of fuel injection pump and the oily amount that take a crock actually not agree with or each crocks of fuel delivery is inhomogenous cause, affect the dynamical sex of diesel engine, economy and reliability directly. One, fuel injection pump offers the account with inhomogenous oil 1.

The different gush oil pump that debugs condition and use condition is undertaking debugging below normal temperature on testing stand, and outfit machine is used is the temperature inside cease, crock is compressed to amount to 700 ℃ of 500 ～ , pressure in cylinder use below condition of 3 ～ 5MPa, both difference is bigger. When engine works, the temperature of fuel injection pump and fuel injector all amounts to 90 ℃ to control, also can cause derv viscosity to drop, consequently force plunger and needle occasionally inside leakage grow in quantity, the quantity that answer oil also is compared when debugging much. According to determining, real in season enters fuel injection pump the oily quantity inside the crock has testing stand to debug a quantity only 80% the left and right sides, although oil pump debugs personnel to be able to consider this factor, but cannot accurate control. Additional, as a result of cylinder bushing piston and compressed air distribution mechanism wear away or of airtight degree different, each crocks of temperature after compressing and pressure also can have a difference. Although good gush oil pump is debugged on testing stand, after outfit machine is used, each crocks of fuel delivery also can arise inhomogenous. 2.

When debugging, exist when offerring pump of oily inhomogenous fuel injection to be debugged in testing stand, the fuel delivery that the requirement issues each crocks in rated rotate speed is inhomogenous degree should ＜ 3% . In debugging a process actually, wait to agree completely impossibly with original machine as a result of fuel injector of testing stand appropriative and high-pressured vitta length, appearance, caliber, plus the difference that debugs a technology, fuel injection pump installs machine hind, real in season is measured into the oil inside the crock inhomogenous degree often ＞ 3% . 3.

Use for a long time what parts breakdown causes for classics of oily inhomogenous engine, because shaft coupling of drive of fuel injection pump is loose free from worries or gap are too big, drive gear wears away, backlash increases, also can affect each crocks of uniformity that offer oil. Additional, because high-pressured vitta connect is frequent oscillatory or screw insufficient leakage, and screw force crosses ambassadorial connect to the metal falls off and jam vitta, what can cause each crocks of fuel delivery likewise is inhomogenous. Additional, in fuel injection pump and governor bedspring, get power among them stronger, be out of shape frequency of bigger, job is taller should belong to force plunger bedspring. So its break off frequency is taller also. Light person fuel injection quantity decreases, each crocks of fuel injection is measured not all, out of tolerance of time interval of each crocks of fuel injection, fuel injection begins time defer; The person that weigh offers oil discontinuous cannot offer oil even. 2, the readjust after machine of outfit of fuel injection pump 1.

Each crocks exhaust temperature, pressure or smoke come to the basis basis of readjust of fuel injection pump judge its the combustion degree of real work circumstance and diesel engine, decide this crocks of fuel delivery to still still cross the little, time that offer oil premature too much thereby late, undertake readjust next. Through adjusting each appropriately crock fuel delivery is mixed the time that offer oil, oil pump inviting in season to diesel engine the principle of distribution according to need of each crocks of according to offers oil, in order to eliminate each crocks of subsistent difference. 2.

The operation technology of readjust of fuel injection pump (after machine of outfit of pump of L) fuel injection, by the regulation standard mix up offers oily time, at the same time debus exhaust manifold, so that observe each crocks job condition. (2) starts diesel engine, idle fast idling 2 ～ 3min, feel the crock lid near each crocks of vent and fuel injector with the hand, if some crock of temperature is exorbitant, but preliminary conclude this crocks of fuel delivery slants much. (3) crosses 50 ℃ when machine Wen Chao when, increase accelerator, let engine play movement in rated rotate speed, examine the smoke of each vent at the same time, the attention listens attentively to the sound of air cylinder. If some crock risks black smoke, explain fuel delivery is too big, with more 135 series with project machine outfit diesel engine is exemple, can adjust fuel injection pump tine lever is pulled to direction stopping oil, loose adjustment the locking bolt on gear, inside the alveolus that takes a fine punty to insert oily quantity to control sleeve, with hammer clap, make its turn right, can reduce fuel delivery, increase conversely. Have ringing knock reputation when some crock, and the difficulty that start, the specification begins for oil premature; Be like on the high side of some crock of temperature, have blaze even ejective, may be to offer oil to begin time too late. Be like 135 series diesel engine, each crocks offer what oil begins time to adjust, decide with the position of oil pump force plunger. Should begin for oil when time is too late, should will time adjustment nut and bolt come back piece a few, begin time for oil premature, screw this bolt a few. (4) examination shifts to an earlier date for oil oily law of general and usable excessive comes to horn the examination shifts to an earlier date for oil horn, be about to oil pump high-pressured vitta connect is loose, tear open the connect of one aspect of the matter of join fuel injector below, change vitta to horizontal position, screw next the high-pressured vitta connect of oil pump, accelerator draws the largest position, open decompression to shake car, appear till high-pressured vitta exit when a few derv till. The derv of rub-up vitta exit, turn slowly again flywheel. At the same time the attention observes the fat face of high-pressured vitta exit, begin to go up in its the instant that move stops rotational flywheel instantly. Right now, the reticle on cistern or airframe should be aimed in before flywheel top dead centre 16 ～ between 20 ° . If both there is oil to spill over before in alignment, the specification shifts to an earlier date for oil part is too large, offer oil premature; If exceeded ability to oil spills over, the specification shifts to an earlier date for oil horn slants small, spend evening for oil. Notable is, to much crock diesel engine, need to install special glass canal and finger, measure the first crock to be in when compressing top dead centre with the fan belt when beginning to offer oil annulus the arc length between on two earmark, shift to an earlier date in order to decide for oil role is proper. Check each monomer pump to offer oily intermittence even at the same time identical, if differ, the spacer ply between the clearance between adjustable force plunger and tappet or oil pump and airframe, make the intermittence that offer oil is achieved consistent. Should shift to an earlier date for oil need to adjust when too small or part is too large, of different type shift to an earlier date for oil horny adjustment the method is different. New 195 and 190 model diesel engine, it is to pass the cupreous spacer between pump of fuel injection of increase and decrease and airframe to adjust shift to an earlier date for oil of horn. Increase spacer to become late for oily time, conversely criterion in advance. 190-1 and 1105 model diesel engine, it is to adjust fuel injection pump to follow those who move column to go up to adjust bolt to adjust shift to an earlier date for oil of horn, to in (outside) pigheaded bolt becomes late for oily time (early) . 4115 model diesel engine is offer oil to shift to an earlier date through adjusting spline to receive dish of relative position with gear of drive of fuel injection pump to change of horn, the suitable hour hand of spline axle sleeve that spline receives oil pump of dish of along with gush is rotational an aperture, shift to an earlier date for oil horn increases 3 ° , make offer oily shift to an ealier time, conversely, anticlockwise roll an aperture, shift to an earlier date for oil horn reduces 3 ° , make the time that offer oil becomes late. After the attune at the beginning of classics above, check temperature of each crocks of exhaust to whether agree, if return the regular job of irreclaimable engine, should measure cylinder pressure to whether be in permission range, change when necessary piston annulus or abrade valve, the pulverization condition that inspects fuel injector and open pressure are normal. CNC Milling CNC Machining