All Chain Tensioners

• This type of chain tensioner has no locking mechanism. It must therefore locked mechanically, before it is removed. You require a piece of wire to lock the tensioner as shown in Fig. 1.21. Make sure the end is twisted securely.

All Chain Tensioners

• Undo the two securing screws and remove the chain tensioner. Treat the chain tensioner with care to ensure it can not unlock. Below the chain tensioner there is a filter which can now be withdrawn.
• In the given order remove the camshaft timing sprocket, the timing chain, the crankshaft timing sprocket and the camshaft. Before removing the chain check for timing marks. If none are visible mark the chain and the corresponding sprockets accordingly. The camshaft is held in position by a keeper plate and three bolts.

Attention: It is possible that there is no timing mark in the chain. In this case mark the chain and the two sprockets at opposite points to have a reference for installation (only if the same parts are refitted).

Fig. 1.73. — Rotate the crankshaft and the camshaft until the two timing marks are aligned as shown.

Thoroughly clean and check all parts of the timing mechanism. Damage or wear can normally be found on the sprocket teeth. Shiny chain rollers are also signs of wear. The filter for the chain tensioner must be cleaned.

Refit the timing mechanism parts as follows:

• Fit a new paper gasket and attach the plate to the cylinder block. Tighten to 1.0 kgm (7.2 ft.lb.).
• Slide the double-row timing sprocket over the crankshaft end and drive it in position (tube). The key must engage, the timing mark must be on the outside.

Rotate the crankshaft and the camshaft until the timing marks are aligned as shown in Fig. 1.73.

Fig. 1.74. — When fitting the timing chain make sure that the timing chain marks and the timing sprocket marks are aligned as shown.

• Place the timing chain over the crankshaft timing sprocket and insert the