- remove all components and parts that prevent access to the end of the engine;
Pic. 96. Camshaft drive mechanism assembly: 1 - crankshaft sprocket; 2 - chain tension shoe; 3 - chain tensioner; 4 - camshaft drive sprocket; 5 - chain damper; 6 - fuel pump drive sprocket; 7 - chain damper; 8 — the lever of a tension of a chain of a drive of the oil pump; 9 - oil pump drive sprocket
Pic. 105. Removing the tension lever
- dismantle the fastening of the tension lever with the pressure shoe of the oil pump drive chain as described in previous subsection, and remove the lever 8 shown in fig. 96 (see also fig. 105);
- unscrew the bolt securing the oil pump drive sprocket and dismantle the sprocket from the shaft, while removing the drive chain from the crankshaft sprocket;
- the position of the sprockets of the camshaft drive and the oil pump drive must be appropriately marked on the crankshaft so that they can be set to their original position during subsequent assembly;
Pic. 99. Marks on the camshaft drive sprocket and drive chain
- paint marks on the camshaft sprocket and camshaft timing chain as shown in fig. 99;
- remove the sprocket from the camshaft, thus loosening the drive chain tension;
- remove the sprocket from the crankshaft using a suitable puller;
- check the condition of the crankshaft keys (sprocket and pulley keys), if there are signs of wear, replace them with new ones;
- if it becomes necessary to replace the crankshaft sprocket, copy the mark from the old sprocket to the new one, marking the corresponding tooth relative to its keyway with paint.
Installing the sprocket on the crankshaft must be done in the following order:
- insert new keys into special sockets of the crankshaft. Both surfaces must be parallel to the axis of the crankshaft;
- Using a suitable drift, press the sprocket onto the crankshaft flange. Check the correct fit of the key;
- install the sprocket and camshaft drive chain. Pay attention to the marking made before dismantling with paint;
- crank the engine several times, paying attention to the marks on the top of the camshaft (see fig. 99);
Pic. 107. Installing the sprocket on the oil pump shaft
- install the oil pump sprocket. The oil pump sprocket hub has special seating edges that match the hole on the oil pump shaft, as shown in fig. 107;
Pic. 106. The correct position of the tension lever of the oil pump drive chain with a pressure shoe
- install the tensioning lever with the pressure shoe for the oil pump drive chain (see fig. 106);
- install the cover of the camshaft drive mechanism in its place (subsection 2.5);
- install in the reverse order of removal.