Sedis Chain Tensioner

• From the front end of the engine remove the crankshaft pulley nut. A tight pulley can be removed with two tyre levers, inserted at opposite points underneath the pulley. Unscrew the timing cover.
• Next is the removal of the chain tensioner. Two types were used during production and must be removed accordingly:

Sedis Chain Tensioner

• Insert a screwdriver as shown in Fig. 1.20 into the chain tensioner bore and press against the chain tensioner pad to release it from the chain. Lock the chain tensioner by turning the screwdriver in the direction of the arrow. The ratchet inside the tensioner will lock the pad in position.

Renold Chain Tensioner

• 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 Below the chain tensioner there is a filter which can now be withdrawn.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.
• Remove the timing cover back plate.
• The removal of the connecting rod and pistons is next. If no markings can be seen on connecting rods and big end bearing caps, use a centre punch and mark each rod and cap with the cylinder number (No. 1 = 1 punch mark, No. 2 = two marks and so on). One after the other remove the big end bearing cap nuts and remove the caps with the bearing shells. The crankshaft must be rotated to gain easy access to two of the bearing caps in turn.