Rocker Arm, Shaft, And Pushrod Replacement - GMC G Service Manual

6A6-6 6.2L DIESEL
4. Wiring harness to the wiring harness clip.
5. Glow plug wires (G-models).
6. CDR valve.
7. Fuel injection lines. Refer to DIESEL FUEL INJEC­
TION (SEC. 6C2).
8. Intake manifold. Refer to "Intake Manifold Replace­
ment" in this section.
Figure 4 — Applying Sealant to the
Rocker Arm Cover
G-MODELS (LEFT SIDE)
H Remove or Disconnect
1. Intake manifold. Refer to "Intake Manifold Replace­
ment" in this section.
2. Fuel injection lines. Refer to DIESEL FUEL INJEC­
TION (SEC. 6C2).
3. Fan upper shroud (vehicles with air conditioning).
4. Air conditioning compressor belt (if equipped).
5. Left exhaust manifold (vehicles with air conditioning).
Refer to "Exhaust Manifold Replacement" in this
section.
6. Air conditioning compressor (if equipped). Refer to
AIR CONDITIONING (SEC. 1B).
7. Dipstick tube front bracket from stud.
8. Wiring harness brackets.
9. Rocker arm cover bolts and fuel return bracket.
NOTICE: Do not pry on the rocker arm cover.
Damage to the sealing surfaces may result.
10. Rocker arm cover.
W Clean
1. RTV from the rocker arm cover and cylinder head. All
loose RTV, or pieces that will cause installation inter­
ference, must be removed.
2. Oil and grease from the sealing surfaces on the
rocker arm cover and cylinder head. Use a suitable
solvent.
l j y | Inspect
• Rocker arm cover sealing flanges for distortion.
Replace as necessary.
H Install or Connect (Figure 4)
NOTICE: Do not allow RTV sealant Into the
rocker arm cover bolt holes. This may cause a
" hydraulic lock" condition when the bolts are
tightened, damaging the cylinder head casting.
1. Rocker arm cover.
2. Rocker arm cover bolts and fuel return bracket.
\*X \ Tighten
• Bolts to 22 N»m (16 ft. lbs.).
3. Wiring harness brackets.
4. Dipstick tube front bracket.
5. Air conditioning compressor (if equipped). Refer to
AIR CONDITIONING (SEC. 1B).
6. Left exhaust manifold (if removed). Refer to "Exhaust
Manifold Replacement" in this section.
7. Air conditioning compressor belt (if equipped).
8. Fan upper shroud (if removed).
9. Fuel injection lines. Refer to DIESEL FUEL INJEC­
TION (SEC. 6C2).
10. Intake manifold. Refer to "Intake Manifold Replace­
ment" in this section.
ROCKER ARM, SHAFT, AND
PUSHROD REPLACEMENT
H Remove or Disconnect (Figures 5 and 6)
1. Rocker arm cover. Refer to "Rocker Arm Cover
Replacement" in this section.
2. Rocker arm shaft bolts.
3. Rocker arm shaft with rocker arms. Mark the assem­
blies so they can be returned to their original
locations.
4. Pushrods.
m Important
• The pushrods must be installed in the original
direction at assembly. This is because the
pushrods have a different degree of hardness at
each end. A paint stripe identifies the upper end
of the pushrod. If the paint stripe is not visible,
mark the pushrods on the upper end as they are
removed.
• The pushrods should be installed in the same
location at assembly.
5. Rocker arms, if required.
• Insert a screwdriver into the rocker arm shaft
bore, and break off the end of the nylon rocker
arm retainers.
• Remove the rocker arm retainers with pliers
(figure 6).
• Slide the rocker arms from the shaft.