If the plunger or barrel of a fuel injection jerk pump becomes damaged, __________.
⢠Construction and operation of a fuel injection jerk pump (barrel and plunger fit) ⢠Importance of precise clearances between barrel and plunger for high-pressure fuel injection ⢠Manufacturer and class/USCG guidance on replacing matched precision parts in fuel injection equipment
⢠Think about how high the pressure is in a jerk pump and how small the clearances must be between moving parts for it to work properly. ⢠Consider whether the barrel and plunger are manufactured and lapped together as a matched set, or if they are interchangeable parts. ⢠Ask yourself what could happen to injection timing, pressure, and leakage if only one of two closely fitted parts is replaced.
⢠Verify whether the barrel and plunger are lapped/matched together during manufacture. ⢠Consider if replacing only one component would affect sealing and fuel leakage at high pressure. ⢠Think about standard maintenance practice for precision injection pump elements in marine diesel engines.
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