Front Cover Replacement - GMC G Service Manual

i f f l Tighten
• Bolts to 40 N«m (30 ft. lbs.).
• Lower the vehicle, if necessary.
5. Accessory drive belts. Tension as outlined in
ENGINE COOLING (SEC. 6B1).
6. Fan upper shroud (G-models).
7. Battery cables.

FRONT COVER REPLACEMENT

H
Remove or Disconnect (Figures
• Drain the cooling system.
1. Water pump. Refer to ENGINE COOLING (SEC.
6B1).
• Rotate the engine until the timing marks on the pump
gear and camshaft gear are aligned (figure 16).
• Scribe a mark aligning the injection pump flange and
front cover.
2. Torsional damper. Refer to "Torsional Damper and
Front Crankshaft Seal Replacement" in this section.
3. Four front cover to oil pan bolts.
4. Two fuel return line clips.
5. Injection pump gear.
6. Injection pump retaining nuts at the front cover.
7. Baffle, if equipped.
8. Remaining front cover bolts.
9. Front cover.
10. Front crankshaft seal. Pry out with a screwdriver.
Fin
Clean
• RTV from oil pan sealing surface.
• Sealing surfaces on front cover.
Figure 15 — Front Cover and Components
15 16)
and
Figure 16 — Injection Pump Gear and Timing Marks
iL r l Inspect
B
6 .2 L DIESEL 6A6-15
• Front cover for cracks or damage to sealing surfaces.
Install or Connect (Figures 14, 15 and 16)
Tool Required:
J 22102 Seal Installer
1. New front crankshaft seal to the front cover. Use
J 22102 (figure 14).
• Apply a 2 mm (3/32-inch) bead of anaerobic sealant
(GM part number 1052357 or equivalent) to the front
cover sealing area shown in figure 15.
Apply a 5mm (3/16-inch) bead of RTV sealant (GM
part number 1052915 or equivalent) to the front cover
sealing surface that mates against the oil pan. The
sealer must be wet to the touch when the belts are
torqued.