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REPAIR INSTRUCTIONS
Electronic Unit Pump (EUP)
Removal
[221 GP]
EUPs must be paint marked with the cylinder
number, and reinstalled at their original locations.
This will eliminate any need to reprogram EUP
information. If a new EUP is installed,
reprogramming must be performed.
1. Place a drain pan beneath the right side of
the engine. Remove the fuel-outlet fitting
from the cylinder block fuel-return gallery
above the air compressor. This allows fuel to
drain from the internal passages.
The EUP spring may be preloaded with
significant spring tension, depending upon
cam lobe position. To avoid injury from the
EUP springing outward, steps 2 through 4
must be followed.
2. Remove the inboard EUP screw completely.
3. Loosen outboard EUP screw and back it out
1/2 inch.
4. Insert screwdrivers under the bolt bosses
(front and rear) and pry until the EUP comes
out against the screw head. (The EUP may
spring out against the screw head.)
The rapid upward movement of the EUP may
result in the tappet spring retainer becoming
dislodged from the plunger foot. If this occurs,
simply reinstall the retainer. This situation does
not indicate any problem with the parts and
should not occur if the above procedures are
followed.
5. Remove outboard EUP screw completely
and remove EUP from the cylinder block.
Refer to Figure 98. Place the EUP in a clean
area and cover it to prevent entry of dirt and
other contaminants.
98
Figure 98 — EUP Removal
6. Remove roller tappet from the EUP bore by
hand (Figure 99). Do not use a tool, as it
could damage the bore. Place the roller
tappet in a clean area and cover it to prevent
the entry of dirt and other contaminants.
99
Figure 99 — Tappet Removal
Oil Fill Tube Removal
Remove capscrews securing oil filler feed tube to
cylinder block. Remove tube.
5_106_00.bk Page 116 Friday, August 4, 2000 11:17 AM
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