Chevrolet Cobalt Service & Repair Manual: Valve Stem Oil Seal R&R
Removal
| Prevent crankshaft from rotating
clockwise or counterclockwise before using compressed air in cylinder. Rotation
of crankshaft may cause damage to flywheel holding tool. |
| 1. |
On vehicles equipped with a manual
transmission, leave transmission in first gear with vehicle
on ground and parking brake set. |
| 2. |
On vehicles equipped with an automatic
transmission, remove starter. |
| 3. |
On all vehicles, install flywheel
holding tool No. J 43653, or equivalent. |
| 4. |
Remove intake or exhaust camshaft,
as required. |
| 5. |
Remove camshaft roller followers (1),
Fig. 1. |
| 6. |
Install valve spring compressor adapter
set (1), tool No. J 43649-10, or equivalent to front and rear of
cylinder head, Fig. 2. |
| 7. |
Install cross bars and locks (2) to
valve spring compressor tool No. J 43649, or equivalent Fig.
2. |
| 9. |
Install an air hose adaptor into spark
plug hole. |
| 10. |
Pressurize cylinder to 100 psi. |
| 11. |
Compress valve spring using valve spring
compressor (3), Fig. 2. |
| 12. |
Remove valve spring keepers (1),
Fig. 3. |
| 13. |
Remove valve spring retainers (2) and
springs (3), Fig. 3. |
| 14. |
Remove valve seal (2) using valve guide
seal remover (1) tool No. J 36017, or equivalent, Fig.
4. |
|
Installation
| 1. |
Install valve seal using valve guide
seal remover tool No. J 36017, or equivalent, Fig. 4. |
| 2. |
Install valve spring and retainer. |
| 3. |
Compress valve spring. |
| 4. |
Install valve spring keepers, Fig.
3. |
| 5. |
Remove air hose adaptor from spark
plug hole. |
| 6. |
Remove valve spring compressor tool
No. J 43649, or equivalent, from cylinder head. |
| 8. |
Install camshaft roller followers. |
| 10. |
Install starter, as required. |
| 11. |
Remove flywheel holding tool No. J
43653, or equivalent. |
|
Fig. 1 Camshaft roller followers
Fig. 2 Valve spring compressor
Fig. 3 Valve spring keepers
Fig. 4 Valve spring guide replacement
This procedure is designed to
replace valve spring while head is attached to engine.
1.
Install a suitable flywheel holding
tool in order to prevent ...
1.
Remove the engine coolant temperature
sensor, Fig. 1.
2.
Remove the thermostat and water feed
pipe retaining bolts, Fig. 2.
...
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