Fuel System Components Bench Procedures; Electronic Unit Pump (Eup) Inspection; Installation Of Electronic Unit Pump Plunger Spring And Seat - Mack E-TECH SB-210-034 Service Manual

5_106_00.bk Page 219 Friday, August 4, 2000 11:17 AM
FUEL SYSTEM COMPONENTS
BENCH PROCEDURES
Electronic Unit Pump (EUP)
Inspection
[221 GP]
Refer to Figure 224.
Visually inspect each electronic unit pump
assembly and O-rings for signs of wear or
damage. Replace the O-rings as required. If a
pump is damaged or not operating properly,
replace the pump; it is not repairable.
224
Figure 224 — Electronic Unit Pump Assembly
BDC for engine manuals and specs
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REPAIR INSTRUCTIONS
Installation of Electronic Unit Pump
Plunger Spring and Seat
Improper removal of an electronic unit pump
(EUP) from an engine, or certain failures such as
broken EUP hold-down bolts, will result in a rapid
pop-up of the pump from the bore. Should this
occur, the unit pump tappet spring seat can
dislodge from the plunger foot. The plunger,
however, is retained by a retaining clip, so it will
remain in place. Should a spring seat dislodge,
no damage occurs to any of the parts involved,
and the unit pump may be reassembled as
described below.
When servicing a unit pump, take care not to
damage any machined or threaded surfaces.
Work should be performed on a clean, non-
metallic surface.
1. Remove the plunger retaining clip.
225
1. Retaining Clip
Figure 225 — Plunger Retaining Clip Removal
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