Chevrolet 1988 Light Duty Truck Repair Manual page 364

6A1-12 2.5 LITER L4 ENGINE
A Ridge Reamer
B C loth
Figure 16— Removing the Cylinder Ridge
• Using the m anufacturer's directions, install a
ridge ream er 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.
C onnecting rod caps (116) as follows: Take note of
th e a rra n g e m e n t o f th e c o n n e c tin g
markings, to insure proper reassembly. Use a silver
pencil to mark the parts if necessary.
• To avoid m ism atching the connecting rods and
c o n n e c tin g
connecting rod cap at a time. Place the piston
at the bottom of its stroke.
• Remove the nuts (56).
• Remove the connecting rod cap.
• Install two sections of 10 mm (3/s-inch) rubber
hose over the connecting rod studs. This will
p re v e n t th e c o n n e c tin g
scra tch in g the bore or cranksh aft jo u rn a l
during the removal process.
3. Connecting rod (53) and piston (51) from the block.
• Push the connecting rod and piston from the
block being careful not to let the connecting
B-05065
rod contact the cylinder bore.
• Loosely assem ble the connecting rod cap
(116) onto the connecting rod.
• Take note of, or mark the connecting rod and
piston assem bly and the c ylin d e r bore to
assure that each assem bly is returned to its
original bore.
• R epeat th is p ro ce d u re on the re m a in in g
connecting rod assemblies.
FLYWHEEL REMOVAL
rod (53)
|+ + | R em o ve or D isco n n ect (F ig u re 5)
1. Flywheel bolts (66).
2. Flywheel (67).
3. Spacer (68).
CRANKSHAFT REMOVAL
The main bearings and rear oil seal can be replaced
w ithout removing the crankshaft, as outlined later in this
0
section.
R em o ve or D isco n n ec t (F ig u res 5, 18 and 19)
C heck the main bearing caps (124 and 126) location
m arkings. 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.
Crankshaft tim ing gear (87).
Bolts (125).
Main bearing caps (124 and 126).
C rankshaft (88). Lift the crankshaft straight up,
taking care to avoid dam age to the crankshaft
journals and thrust flange surfaces.
Seal (71).
Main bearing inserts (figure 19).
• If the main bearing inserts are to be reused,
mark them to insure they are installed in their
original positions before removal.
rod c a p s , re m o v e o n ly one
rod s tu d s fro m