Rocker Arm Cover Replacement - GMC G Service Manual

2. Exhaust pipe to the manifold. Refer to EXHAUST
(SEC. 6F).
• Lower the vehicle.
3. Remaining exhaust manifold bolts and air condition­
ing compressor rear bracket (if equipped).
ICU Tighten
• Bolts to 35 N*m (26 ft. lbs.).
4. Glow plugs.
5. Dipstick tube.
6. Battery cables.
G-MODELS (BOTH SIDES)
H Remove or Disconnect
1. Battery cables.
• Raise the vehicle. Support with suitable safety
stands.
2. Exhaust pipe at the manifold. Refer to EXHAUST
(SEC. 6F).
• Lower the vehicle.
3. Engine cover.
Glow plug wires.
4.
5. Air conditioning compressor rear bracket (if
equipped) (left side exhaust manifold).
6. Exhaust manifold bolts and exhaust manifold.
H Clean
• Sealing surfaces on the exhaust manifold and cylin­
der head.
• Threads on the manifold bolts.
I44! Install or Connect
1. Exhaust manifold.
2. Exhaust manifold bolts and air conditioning compres­
sor rear bracket (if equipped) (left side exhaust
manifold).
HO
Tighten
• Bolts to 35 N»m (26 ft. lbs.).
3. Glow plug wires.
Engine cover.
4.
• Raise the vehicle. Support with suitable safety
stands.
5. Exhaust pipe to the manifold. Refer to EXHAUST
(SEC. 6F).
6. Lower the vehicle.
7. Battery cables.
6.2L DIESEL 6A6-5
ROCKER ARM COVER
REPLACEMENT
R/V MODELS (BOTH SIDES)
G-MODELS (RIGHT 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). (Injection lines for #5 and #7 cyl­
inders do not have to be removed for right side rocker
arm cover replacement.)
3. CDR valve.
4. Glow plug wires (G-models).
5. Wiring harness from wiring harness clip.
6. Wiring harness bracket (left rocker arm cover).
7. Rocker arm cover bolts.
NOTICE: Do not pry on the rocker arm cover.
Damage to sealing surfaces may result.
8. Rocker arm cover.
I V i 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«|
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.
• Apply a 5 mm (3/16-inch) bead of RTV sealant (GM
part number 1052915 or equivalent) to the cylinder
head, inboard of the bolt holes. Refer to figure 4. The
sealant must be wet to the touch when the bolts are
torqued.
1. Rocker arm cover.
2. Rocker arm cover bolts.
H Q Tighten
• Bolts to 22 N»m (16 ft. lbs.).
3. Wiring harness bracket.