Page 282
REPAIR INSTRUCTIONS, PART 1
316
Figure 316 — Spring Seat Installation
7. Using the heel of the hand, press down on
the plunger and spring seat until a click is
heard. The click indicates that the plunger
has been pushed down, and the retaining
clip has seated to hold the plunger, spring
and spring seat in place.
317
Figure 317 — Plunger and Spring Seat Seating
8. Install new O-rings and lubricate with clean
engine oil.
9. For engines which have a history of small
fuel leakage into the crankcase, a new delta
seal (available through the MACK Parts
System) should be installed on the lower
O-ring position.
Due to the design of the delta seal O-ring, the
cam lobe must be positioned with the base circle
UP prior to installing each of the EUPs to avoid
damaging the delta seals. The engine barring tool
(tool No. J 3857-A) must be used to rotate the
engine. DO NOT use the starter motor to rotate
the engine.
318
Figure 318 — EUP with Delta O-Ring Seal
10. Reinstall the unit pump into the engine using
the procedures outlined under Engine
Reassembly in the REPAIR
INSTRUCTIONS section.
5-111.bk Page 282 Monday, July 10, 2006 2:26 PM
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