Chevrolet Cobalt Service & Repair Manual: Crankshaft Main Bearing Clearance Measure
Method A
| 1. |
Measure the crankshaft bearing journal
diameter with a micrometer in several places, 90 degrees apart.
Average the measurements. |
| 2. |
Measure the crankshaft bearing journal
taper and runout. |
| 3. |
Install the lower crankcase and tighten
the bearing cap bolts to specification. |
| 4. |
Measure bearing inside diameter (ID)
in several places 90 degrees apart, average measurements. |
| 5. |
Subtract journal measurement from bearing
ID measurement to determine clearance. |
| 6. |
Determine whether clearance is within
specification. |
| 7. |
If out of specification, choose different
inserts. |
| 8. |
Measure the connecting rod inside diameter
in the same direction as the length of the rod with an inside micrometer. |
| 9. |
Measure the crankshaft main bearing
inside diameter with an inside micrometer. |
|
Method B
| 1. |
Clean the used bearing inserts. |
| 2. |
Install the used bearing inserts. |
| 3. |
Place a piece of gaging plastic across
the entire bearing width. |
| 4. |
Install the bearing caps. In order
to prevent the possibility of cylinder block or crankshaft bearing
cap damage, the crankshaft bearing caps are tapped into the cylinder
block cavity using a brass, lead, or a leather mallet before the
attaching bolts are installed. Do not use attaching bolts to pull
the crankshaft bearing caps into the seats. Failure to use this
process may damage a cylinder block or a bearing cap. |
| 5. |
Install the bearing cap bolts to specification.
Do not rotate the crankshaft. |
| 6. |
Remove the bearing cap, leaving the
gaging plastic in place. It does not matter whether the gaging plastic
adheres to the journal or to the bearing cap. |
| 7. |
Measure the gaging plastic at its widest
point with the scale printed on the gaging plastic package. |
| 8. |
Remove the gaging plastic. |
|
Removal
1.
Raise and support vehicle.
2.
Remove front tire and wheel assembly.
3.
Remove front fender liner.
...
Removal
1.
Remove transaxle.
2.
Remove flywheel or flexplate.
3.
Remove crankshaft rear oil seal using
suit ...
Crankshaft Damper R&R
Crankshaft Rear Oil Seal R&R