REMOVAL & INSTALLATION
1.8L, 2.0L and 2.2L OHV Engines
See Figure 1
- As outlined earlier, remove the engine and place it on a suitable engine stand.
- Remove the cylinder head cover, pivot the rocker arms to the sides, and remove the pushrods, keeping them in order. Remove the valve lifters, keeping them in order. There are special tools which make lifter removal easier.
- Remove the front cover.
- If necessary, remove the oil pump drive.
- If equipped, remove the distributor.
- Remove the fuel pump and its pushrod.
- Remove the timing chain and sprocket as described earlier in this section.
- Carefully pull the camshaft from the block, being sure that the camshaft lobes do not contact the bearings.
- To install, lubricate the camshaft journals with clean engine oil. Lubricate the lobes with Molykote® or the equivalent.
- Install the camshaft into the engine, being extremely careful not to contact the bearings with the cam lobes.
- Install the timing chain and sprocket. Install the fuel pump and pushrod. Install the timing cover. Install the distributor.
- Install the valve lifters. If a new camshaft has been installed, new lifters should be used to ensure durability of the cam lobes.
- Install the pushrods and rocker arms and the intake manifold. Adjust the valve lash after installing the engine. Install the cylinder head cover.
See Figure 2
The following procedure requires the use of a special tool.
- Disconnect the negative battery cable.
- Remove camshaft carrier cover, as outlined earlier in this section.
- Using valve train compressing Fixture J-33302, which holds the valves in place, compress valve springs and remove rocker arms.
- As outlined earlier, remove the timing belt front cover and the timing belt.
- Remove camshaft sprocket as previously outlined.
- If equipped, remove the distributor.
- Remove camshaft thrust plate from rear of camshaft carrier.
- Slide camshaft rearward, then carefully remove it from the carrier.
- Install a new camshaft carrier front oil seal using Tool J-33085.
- Place camshaft in the carrier.
- Install camshaft thrust plate retaining bolts. Tighten the bolts to 70 inch lbs. (7.8 Nm).
- Check camshaft end play, which should be within 0.0006-0.0025 in. (0.016-0.064mm).
- Install distributor.
- Install camshaft sprocket as previously described.
- Install timing belt as previously described.
- Install timing belt front cover.
- Using valve train compressing fixture J-33302, compress valve springs and replace rocker arms.
- Install camshaft carrier cover as previously described.
- Remove the engine assembly as outlined earlier.
- Remove intake manifold, valve lifters and timing chain cover as described in this section.
- Remove fuel pump and pump pushrod.
- Remove camshaft sprocket bolts, sprocket and timing chain. A light blow to the lower edge of a tight sprocket should free it (use a plastic mallet).
- Remove the timing chain tensioner.
- If applicable, remove the oil pump drive shaft extension.
- Install two bolts in cam bolt holes and pull cam from block.
- Lubricate the camshaft journals with engine oil and reverse removal procedure aligning the sprocket timing marks.
If a new camshaft is being installed, coat the camshaft lobes with GM Engine Oil Supplement (E.O.S.), or equivalent.
See Figure 3
It is recommended that this procedure be performed by a machine shop.
- Remove the camshaft assembly, for details refer to the necessary service procedure.
- To remove the camshaft bearings use a special tool (refer to the illustrations) select the proper pilot, nut and thrust washer.
- Carefully pull out the camshaft bearings.
- To install the camshaft bearings place the bearing onto the tool and index the oil holes of the bearing with the oil passages in the cylinder block. Pull bearing into proper place.
Proper alignment of the oil holes is critical. Restriction of the oil flow will cause severe engine damage.