Camshaft: Service and Repair
Camshaft, Renew
- Remove camshaft cover.
- Drain the cooling system.
- Rotate the engine and set No.1 cylinder at TDC using Service Tool 18G 1433A (1 Fig. 1).
- Push back the lock tabs (1 Fig. 2) from the camshaft sprocket securing bolts (2 Fig. 2), and slacken off the bolts.
- Remove the upper chain tensioner valve clamp bolt (3 Fig. 2), remove the clamp (4 Fig. 2) and remove the valve (5 Fig. 2).
- Using a 3 mm Allen key, wind back the tensioner (6 Fig. 2) (turn clockwise) until the snail engages in the park position. Remove the tensioner housing securing bolt (7 Fig. 2) and withdraw the tensioner assembly (8, 9 Fig. 2).
- Remove and discard the `O' ring (9 Fig. 2) and gasket (10 Fig. 2).
- Remove the camshaft sprocket securing bolts and tab washers (1, 2 Fig. 2) and remove the sprockets (11 Fig. 2) (ensure that neither the bolts nor the tab washer drop into the timing case).
CAUTION: Do not rotate the engine while the camshaft is disconnected.
- Remove the cylinder head bolt from No.2 cap, left-hand camshaft (1 Fig. 3).
- Remove No.2 cap from the left-hand camshaft.
- Fit spacer tool 18G 1435 (2 Fig. 3) to the head.
- Fit and torque tighten the cylinder head bolt.
- Repeat the procedure for Nos 3, 4, 5 and 6 caps, left-hand camshaft (3 Fig. 3).
- Remove the cylinder head bolt from No.7 cap, left-hand camshaft.
- Loosen in sequence the securing bolts from Nos 1 and 7 caps, until the left-hand camshaft is free. Lift the camshaft from the cylinder head and fit spacer tool 18G 1435 to No. 7 cylinder head bolt position (5 Fig. 3). Fit and torque tighten the bolt.
- Repeat the procedure for the right-hand camshaft.
- Clean all components and examine for wear and damage. Renew all worn or damaged components.
- Lubricate the new left-hand camshaft.
- Fit the camshaft at approximately TDC.
- Lubricate Nos 1 and 7 caps.
- Fit No.1 cap but do not tighten the securing bolts. Remove No.7 cap cylinder head bolt.
- Remove the spacer tool. Fit No.7 cap but do not tighten the securing bolts.
- Finally tighten Nos 1 and 7 cap securing bolts in sequence. Remove No.4 cap cylinder head bolt and remove the spacer tool. Lubricate and fit No.4 cap.
CAUTION: The cylinder head bolts MUST be renewed during assembly and torque tightened as described in Service Procedures under Engine Service and Repair, SPS Joint Control System.
- Fit and tighten No.4 cap securing bolts.
- Fit and tighten No.4 cap cylinder head bolt.
- Repeat the procedure for Nos 2, 3, 5 and 6 caps, left-hand camshaft.
- Set the left-hand camshaft to TDC.
- Repeat the procedure for the right-hand camshaft.
- Check and adjust the valve clearances.
- Refit the camshaft cover.