SERVICE MANUALROBERT BOSCH MODEL MW INJECTION PUMPSection 11Figure 3.MULTIPLE PLUNGER DESIGNThe injection pump is of the multiple plunger design withone plunger, barrel and delivery valve assembly for eachengine cylinder (Figure 3). Each plunger is activated bythe pump camshaft through roller tappet followers. Pumprotation, as viewed from the drive end of the pump, isclockwise and at one-half engine speed. Three gearsare used to drive the injection pump; the crankshaft gear,engine idler gear and the injection pump gear which isbolted to the injection pump hub.INJECTION PUMP LUBRICATIONEngine lubricating oil flows through an external line fromthe crankcase to a pump housing oil inlet fitting locatedslightly to the rear of the hand priming pump (Figure 4).Oil then flows through a housing passage which indexeswith the number four tapped body. All oil lubricated partswithin the injection pump and governor are lubricated bysplash with the exception of the number four tappetbody. Oil flow into the injection pump is very low.Therefore, a minimum of one pint of oil must be addedthrough the upper governor housing plug when aninjection pump is installed. Return oil flows out of theinjection pump housing at an opening just above thefront camshaft bearing and into the engine front cover.Engine oil and filters should be changed at the intervalsrecommended by International Harvester to preventbuildup of wear materials in the oil, replace essentialanti-wear additives and maintain lubricating oildisparancy. If inadequate oil filters, extended oil drainintervals, or non-recommended oil classifications areused, engine and injection pump life will be reduced.CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 4
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