Removal
1. Remove the cylinder head as described in Section Removal, inspection and installation of the cylinder head, and place it on the workbench.
2a. Gradually loosen the rocker arm shaft mounting bolts and the mounting plate to the cylinder head.
2b. Remove the shaft (refer to the illustrations).
3. Holding the camshaft with a wrench installed on special grooves on the camshaft, or with a suitable tool inserted through the holes in the gear wheel, unscrew the bolt and remove the pulley.
4. On the E7J engine, use a socket wrench to loosen the two bolts and remove the distributor. There is no need to mark the distributor location, as it is impossible to adjust its position.
5a. On the K7M engine, unscrew the bolts.
5b. Remove the cover and remove the gasket from the left end of the cylinder head (refer to the illustrations).
6. Using a micrometer, measure the axial clearance of the camshaft and compare it with that shown in Specifications. In this way, the wear of the support plate can be determined.
7a. Unscrew the two bolts.
7b. Remove the support plate from the groove in the camshaft (refer to the illustrations).
8. Remove the camshaft from the cylinder head from the pulley side, being careful not to damage the working surfaces (refer to the accompanying illustration).
Inspection
1. Inspect the camshaft bearing surfaces and cam lobe surfaces for wear and scratches. Also inspect the rocker arm shaft for signs of wear. If necessary, the shaft can be removed for inspection (refer to the accompanying illustration). Replace worn components as necessary.
2. Check the condition of the working surfaces on the camshaft and in the cylinder head. If the working surfaces in the head are excessively worn, a new head will be required.
Installation
1. Lubricate the bearing surfaces in the cylinder head and the camshaft lobes, then insert the camshaft into the head.
2. Install the support plate, then insert and tighten the bolts.
3. Measure the axial clearance as described in paragraph 6 and ensure that it is within the limits given in Specifications. Excessive axial clearance can only be due to wear of the support plate or camshaft.
4. On the E7J engine, install the distributor and tighten the two bolts using a socket wrench.
5. On the K7M engine, install the end cover with a new gasket and tighten the bolts.
6. Replace the oil seal (Section Replacing the camshaft seal), then install the camshaft gear, making sure the key fits into the slot on the end of the camshaft. Lock the camshaft, then insert and tighten the bolt to the specified Specifications effort.
7. Install the rocker arm shaft and mounting plate, then insert the bolts back into place and tighten them to the specified torque Specifications by effort (refer to the accompanying illustration). Please note that the bolt threads and the head contact surfaces must be lubricated with oil. Hollow bolts are installed at each end and in the middle.
9. Install the cylinder head (refer to Section Removal, inspection and installation of the cylinder head).