Page 416
REPAIR INSTRUCTIONS, PART 2
EGR Valve Heat Shields Removal
and Installation
All ASET™ engines are equipped with EUP
shields carried over from the current E-Tech™
engine. However, an additional shield is installed
on the AC engine to protect the EGR valve,
harness connections and oil lines. The EGR
valve heat shield protects the valve from heat
radiating off the turbocharger and exhaust
manifold.
Procedures for removing and installing the EGR
heat shield with the EGR valve assembly
removed are described in the following section:
REMOVAL PROCEDURE
Soot coating of the EGR valve heat shield
surfaces in the vicinity of the valve shaft is to be
expected. The sealing method used is similar to a
piston ring, and therefore, a small amount of soot
leakage will always be present.
1. Remove the three retaining nuts and remove
the two outer EUP heat shields.
2. Remove the four capscrews retaining the
inner EUP heat shield and tilt the shield up
to gain access to the EUPs. Secure the
inner shield in this position, out-of-the-way.
The later design inner heat shield is a two-piece
unit.
3. Remove the fuel nozzle inlet tube
assemblies for the Nos. 1 and 2 cylinders as
follows:
앫 Loosen the tube sleeve nut at the
electronic unit pump (EUP). Be careful
to avoid twisting the line while
loosening the nut.
앫 Loosen the tube clamping screw at the
cylinder head and remove the tube
assembly. Cap the line and fittings to
prevent contaminants from entering the
system.
4. Remove the EGR valve heat shield.
506
Figure 506 — EGR and EUP Heat Shields
1. Outer EUP Heat Shields
2. Inner EUP Heat Shield (Two Piece)
3. EGR Valve Heat Shield
4. Cylinder Heads
5. Exhaust Manifold
5-111.bk Page 416 Monday, July 10, 2006 2:26 PM
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