Chevrolet Cobalt Service & Repair Manual: Valve Stem Oil Seal R&R

Chevrolet Cobalt Service & Repair Manual / Engine Service / 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.
8. Remove spark plugs.
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.
7. Install spark plugs.
8. Install camshaft roller followers.
9. Install camshaft.
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

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