Flywheel R E M O V A; Crankshaft Removal - GMC 1989 Light Duty Truck Repair Manual

A 2.5 LITER L4 ENGINE
6 1 - 1 2
A Ridge Reamer
B Cloth
Figure 16— Removing the Cylinder Ridge
• Using the m anufacturer's directions, install a
ridge reamer into the top of the cylinder.
Perform the cutting operation.
• After the ridge and/or deposits are removed,
remove the ridge reamer. Turn the crankshaft
until the piston is at the top of its stroke.
Remove the cloth and the cuttings.
• Repeat this procedure for each piston.
2. Connecting rod caps (116) as follows: Take note of
th e a rra n g e m e n t of the c o n n e c tin g rod (53)
markings, to insure proper reassembly. Use a silver
pencil to mark the parts if necessary.
• To avoid mismatching the connecting rods and
• Remove the nuts (56).
• Remove the connecting rod cap.
• Install two sections of 10 mm (3/s-inch) rubber
3. Connecting rod (53) and piston (51) from the block.
• Push the connecting rod and piston from the
B-05065
• Loosely assemble the connecting rod cap
• Take note of, or mark the connecting rod and
• R epeat th is procedure on the rem aining
R em ove or D isconnect (Figure 5)
1. Flywheel bolts (66).
2. Flywheel (67).
3. Spacer (68).

CRANKSHAFT REMOVAL

The main bearings and rear oil seal can be replaced
without removing the crankshaft, as outlined later in this
section.
R em ove or D isconnect (Figures 5, 18 and 19)
• Check the main bearing caps (124 and 126) location
markings. The main bearing caps are numbered 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,
taking care to avoid damage to the crankshaft
journals and thrust flange surfaces.
5. Seal (71).
6. Main bearing inserts (figure 19).
• If the main bearing inserts are to be reused,
c o n n e c tin g rod ca p s, rem ove o n ly one
connecting rod cap at a time. Place the piston
at the bottom of its stroke.
hose over the connecting rod studs. This will
p re v e n t th e c o n n e c tin g rod s tu d s from
scratching the bore or crankshaft journal
during the removal process.
block being careful not to let the connecting
rod contact the cylinder bore.
(116) onto the connecting rod.
piston assem bly and the cylind er bore to
assure that each assembly is returned to its
original bore.
connecting rod assemblies.
FLYWHEEL REMOVAL
mark them to insure they are installed in their
original positions before removal.