Chevrolet Cobalt Service & Repair Manual: Engine Leak Inspection
| A visual inspection must always
be performed to confirm the presence of aftermarket components, potential
collision damage, or areas of concern. |
| Before moving the vehicle inspect
underneath for signs of oil on the ground to aid in identifying the leaks
location. |
| Always clean engine and surrounding
area before starting the inspection. The origination of the leak can be
narrowed down considerably during cleaning. |
| 1. |
Visually inspect engine compartment
and top of engine for signs of leakage. |
| 2. |
Inspect engine oil, if "milky" in color
and consistency, oil has been contaminated by coolant and cooling
system should be pressure tested as outlined in "Cooling System
Leak, Inspection." |
| 3. |
Inspect valve cover and intake manifold
gasket/seals for leakage. |
| 4. |
Inspect head gasket area for leakage. |
| 5. |
Inspect front cover gasket area for
leakage. |
| 6. |
Raise and support vehicle using a suitable
lift. |
| 7. |
Inspect oil pressure/level sensors
for leakage. |
| 8. |
Inspect oil dipstick tube base for
leakage. |
| 9. |
If equipped, inspect oil cooler/lines
for leakage. |
| 10. |
If equipped, inspect turbocharger oil
lines for leakage. |
| 11. |
Inspect oil filter/housing for leakage. |
| 12. |
Inspect oil pan gasket/seal area for
leakage. |
| 13. |
Inspect front pulley/dampener area
for front main seal leakage. |
| 14. |
Inspect transmission/transaxle to engine
area for rear main seal or oil passage plug leakage. |
| 15. |
If no external leaks are present, engine
valve guides may be worn and leaking. |
| 16. |
Once leak has been detected repair
system as required. |
|
Some manufacturer supplied short
block assemblies do not come equipped with crankshaft and dampener. In-block
cam short block assemblies may not include camshaft and timing gear. If
...
Refer to Fig. 1
when performing the following procedure.
1.
Remove the air cleaner assembly.
2.
Support the engine with a hydr ...
See also:
Chevrolet Cobalt Service & Repair Manual. Passkey Module
On models equipped with the Passkey
Theft Deterrent System, a new password must be learned by the PCM when the
BCM/PCM has been replaced. When the PCM is replaced, the EEPROM calibration
is flashed into the new PCM. Refer to latest GM Techline or equivalent information
for PCM ...
Engine Assembly-Short Block R&R
Engine Mount Bracket R&R