Crankshaft Rear Oil Seal Removal (W Ithout Removing Crankshaft); Main Bearing Removal (W Ithout Removing The Crankshaft); Camshaft Removal - Chevrolet 1991 Light Duty Truck Repair Manual

6A1-12 2.5L L4 ENGINE
B
Remove or Disconnect (Figures 4, 16 and 17)
• Check the main bearing caps (124 and 126) loca­
tion markings. The main bearing caps are num­
bered 1 through 5 from the front to the rear of the
engine. The caps must be returned to their original
locations during engine assembly.
1. Crankshaft timing gear (87).
2 Bolts (125).
3. Main bearing caps (124 and 126).
4. Crankshaft (88). Lift the crankshaft straight up, tak­
ing care to avoid damage to the crankshaft jour­
nals and thrust flange surfaces.
5. Seal (71).
6. Main bearing inserts (figure 18).
• If the main bearing inserts are to be reused,
mark them to insure they are installed in their
original positions before removal.
CRANKSHAFT REAR OIL SEAL
REMOVAL (W ITHOUT REMOVING
CRANKSHAFT)
B
Remove or Disconnect (Figure 4)
NOTICE:Care m ust be taken not to damage
the crankshaft outside diameter surface with
the p ry tool.
1. Rear crankshaft oil seal.
• Pry the seal out with a screwdriver. Take care
not to scratch the crankshaft.
MAIN BEARING REMOVAL
(W ITHOUT REMOVING THE
CRANKSHAFT)
B
Remove or Disconnect
Tool Required:
J 8080 Main Bearing Remover/Installer
1. Main bearing caps (124 and 126).
• Check the main bearing caps for location mark­
ings. Mark the caps if necessary. The caps
must be returned to their original locations dur­
ing assembly.
2. Lower main bearing inserts (86) from the main
bearing caps.
3. Upper main bearing inserts (86).
• Insert J 8080 into the crankshaft oil hole.
• Rotate the crankshaft to "turn" the bearing out
of the block.

CAMSHAFT REMOVAL

|+ + | Remove or Disconnect (Figures
• Turn the camshaft (108) until the bolts (103) are
visible through the holes in the camshaft gear
(104).
1. Bolts (103).
2. Camshaft (108). Pull the camshaft out of the block.
Support the camshaft carefully when removing
to prevent damage to the camshaft bearings.
4, 18 and 19)
Bolts
1 < M 105 108
\
Figure 19—Camshaft and Timing Gears
F9398