REMOVAL & INSTALLATION
140 cid (2.3L) Engine
The following procedure covers camshaft removal and installation with the cylinder head on or off the engine. If the cylinder head has been removed start with Step 9.
- Drain the cooling system. Remove the air cleaner assembly and disconnect the negative battery cable.
- Remove the spark plug wires from the plugs, disconnect the retainer from the valve cover and position the wires out of the way. Disconnect rubber vacuum lines as necessary.
- Remove all drive belts. Remove the alternator mounting bracket-to-cylinder head mounting bolts, then position the bracket and alternator out of the way.
- Disconnect and remove the upper radiator hose. Disconnect the radiator shroud.
- Remove the fan blades, water pump pulley and fan shroud. Remove the timing belt cover and valve covers.
- Align the engine timing marks at TDC. Remove the timing belt.
- Raise the front of the car and support on jackstands. Remove the front motor mount bolts. Disconnect the lower radiator hose from the radiator. Disconnect and plug the automatic transmission cooler lines, if equipped.
- Position a piece of wood on a floor jack and raise the engine carefully as far as it will go. Place blocks of wood between the engine mounts and crossmember pedestals.
- Remove the rocker arms as described earlier in this section.
- Remove the camshaft drive gear and belt guide using a suitable puller. Remove the front oil seal with a sheet metal screw and slide hammer.
- Remove the camshaft retainer located on the rear mounting stand by unbolting the two bolts.
- Remove the camshaft by carefully withdrawing it toward the front of the engine.
- Check the camshaft journals and lobes for wear. Inspect the cam bearings, if worn (unless the proper bearing installing tool is on hand), the cylinder head must be removed for new bearings to be installed by a machine shop.
- Camshat installation is in the reverse order of removal. Coat the camshaft with heavy SF oil before sliding it into the cylinder head. Install a new front seal. Apply a coat of sealer or teflon tape to the cam drive gear bolt before installation.
After any procedure requiring removal of the rocker arms, each lash adjuster must be fully collapsed after assembly, then released. This must be done before the camshaft is turned. See Valve Clearance-Hydraulic Valve Lash Adjusters.200 cid (3.3L) Engine
- Remove the cylinder head.
- Remove the cylinder front cover, timing chain and sprockets as outlined in the preceding section.
- Disconnect and remove the grille. Remove the gravel deflector.
- Using a magnet, remove the valve lifters and keep them in order so that they can be installed in their original positions.
- Remove the camshaft thrust plate and remove the camshaft by pulling it from the front of the engine. Use care not to damage the camshaft lobes or journals while removing the camshaft from the engine.
- Before installing the camshaft, coat the lobes with engine assembly lubricant and the journals and all valve parts with heavy oil. Clean the oil passage at the rear of the cylinder block with compressed air.
- Remove or reposition the radiator, A/C condenser and grille components as necessary to provide clearance to remove the camshaft.
- Remove the cylinder front cover and timing chain, as previously described in this section.
- Remove the intake manifold and related parts, described earlier in this section.
- Remove the crankcase ventilation valve and tubes from the valve rocker covers. Remove the EGR cooler, if so equipped.
- Remove the rocker arm covers and loosen the rocker arm fulcrum bolts and rotate the rocker arms to the side.
- Remove the pushrods and identify them so that they can be installed in their original positions.
- Remove the valve lifters and place them in a rack so that they can be installed in their original bores.
- Remove the camshaft thrust plate and carefully remove the camshaft by pulling toward the front of the engine. Be careful not to damage the camshaft bearings.
- Before installation, oil the camshaft journals with heavy engine oil SF and apply Lubriplate® or equivalent to the lobes. Carefully slide the camshaft through the bearings.
- Install the camshaft thrust plate with the groove towards the cylinder block.
- Lubricate the lifters with heavy SF engine oil and install them in their original bores.
- Apply Lubriplate® or equivalent to the valve stem tips and each end of the pushrods. Install the pushrods in their original position.
- Lubricate the rocker arms and fulcrum seats with heavy SF engine oil and position the rocker arms over the pushrods.
- Install all other parts previously removed.
- Fill the crankcase and cooling system and adjust the timing.
Degrease the camshaft using safe solvent, clean all oil grooves. Visually inspect the camshaft lobes and bearing journals for excessive wear. If a lobe is questionable, check all lobes and journals with a micrometer.
Measure the lobes from nose to base and again at 90°. The lift is determined by subtracting the second measurement from the first. All of the exhaust lobes should have the same lift and all of the intake lobes should have the same lift, otherwise the camshaft must be reground or replaced. Measure the bearing journals and compare to specifications. If a journal is worn there is a good chance that the camshaft bearings are also worn, requiring replacement.
If the lobes and journals appear intact, place the front and rear cam journals in V-blocks and rest a dial indicator on the center journal. Rotate the camshaft to check for straightness; if deviation exceeds 0.001 inch, replace the camshaft.