REMOVAL & INSTALLATION
See Figure 1
To facilitate the installation, make sure that No. 1 piston is at Top Dead Center before removing the camshaft. Be sure to use the timing cover and timing belt removal and installation procedures to aid in the removal of the sprockets.
- Disconnect the negative battery cable.
- Bring the piston in the No. 1 cylinder to TDC on the compression stroke.
- Remove the cylinder head cover, timing belt front covers and the timing belt.
- Remove the camshaft sprocket.
- Remove the rocker arm/shaft assembly.
- Remove the camshaft and camshaft seal.
- Lubricate the lobes and journals of the camshaft prior to installation.
- Install the camshaft with the keyway facing up.
Install the rocker arm/shaft assembly as follows:
- Loosen the rocker arm locknuts and back off the adjust screws.
- Set the rocker arm/shaft assembly in place and loosely install the bolts.
- Tighten each bolt two turns at a time in the proper sequence to ensure that the rockers do not bind on the valves.
- Tighten the camshaft holder bolts for 1984-91 to 16 ft. lbs. (22 Nm). For 1992-95 engines tighten to the following specifications:8mm bolts:D16Z6, D15Z1 engines: 14 ft. lbs. (20 Nm)D15B7, D15B8 engines: 16 ft. lbs. (22 Nm)6mm bolts:All engines: 9 ft. lbs. (12 Nm)
- Lubricate a new camshaft seal and install using a suitable tool.
- Properly set the tension of the timing belt after installation.
- Tighten the crankshaft pulley bolt to specification. Adjust the valve lash.
Degrease the camshaft using safe solvent, clean all oil grooves. Visually inspect the cam 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. If all exhaust lobes and all intake lobes are not identical, 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 cam bearings are worn too, 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 0.025mm, replace the camshaft.