Page 166
REPAIR INSTRUCTIONS, PART 1
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 the outboard EUP screw and back it
out 1/2 inch (12.7 mm).
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. Refer to “Installation
of Electronic Unit Pump Plunger Spring and Seat”
on page 280 for installation instructions. This
situation does not indicate any problem with the
parts and should not occur if the above
procedures are followed.
5. Remove the outboard EUP screw
completely and remove the EUP from the
cylinder block. Refer to Figure 158. Place
the EUP in a clean area and cover it to
prevent entry of dirt and other contaminants.
158
Figure 158 — EUP Removal
6. Remove the roller tappet from the EUP bore
by hand (Figure 159). 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.
159
Figure 159 — Tappet Removal
5-111.bk Page 166 Monday, July 10, 2006 2:26 PM
To Next Page
