Bold reference numbers in this section identify parts shown in this exploded view diagram. These parts do not appear in the figures near the text.

Loosen screw (22) securing the horizontal cylinder tensioner, collect washer (23) and move tensioner (21) to its rest position.

To remove belt rollers from cylinder head, install tool part no. 88713.2107 to the belt roller to lock rotation, as shown. Fit the bush of tool part no. 88700.5644 to a torque wrench and slacken the belt roller ring nut (13).

Remove the locating screws (24) and the retaining screws (22) of the timing belt tensioners (21) and washer (23).

Use the spanner of tool part no. 88700.5644 to lock rotation of the drive belt roller installed to the casing. Use the bush supplied with the tool to loosen the locking ring nut (6).

Assemble the components fitting belt roller (B) and washer (15) on flange (17) as shown, use reference marks to ensure correct positioning.

Use tool part no. 88713.2107 to prevent belt roller rotation.

Fit the bush of tool part no. 88700.5644 to a torque wrench and tighten ring nuts (13) to the specified torque (Sect. C 3, Engine torque settings).

Working from the belt roller side, fit circlip (25) on the timing layshaft. For correct circlip positioning, insert a protection cap part no. 88700.5749 on the end of the timing shaft.

Fit the first key (26), the inner belt roller (29) with the projecting hub pointing outwards and the guide washer (10) on the timing layshaft.

To prevent accidental loosening which would seriously damage the engine, use new self-locking ring nuts to secure all timing belt rollers.

Use the spanner of service tool part no. 88700.5644 to lock belt roller rotation. Fit the bush supplied with the tool to a torque wrench and tighten the self-locking ring nut to the specified torque value (Sect. C 3, Engine torque settings).

If removed, smear a film of recommended threadlocker onto fixed tensioner (11) and tighten to the specified torque (Sect. C 3, Engine torque settings).

Set tensioners (21) onto vertical and horizontal cylinders. Screw in screw (22) with washer (23) and screw (24), but do not tighten yet so that tensioners can rotate.

Rotate the crankshaft until bringing the piston of the horizontal cylinder at TDC during the combustion stroke. This is indicated by the mark (A) on the timing layshaft belt roller (8) aligning with the mark (B) on the clutch cover.

Fit the locking tool part no. 88713.2011 to the crankshaft and tighten by hand pin (E) fully home.

Tighten the two tools part no. 88713.2009 as shown in the figure to lock the flanges (17) of the horizontal and vertical belt rollers (16). Tool ends must locate into the flange slots.

Install the horizontal (9) and vertical (28) timing belts manually. Do not use any tools and do not disturb belt rollers alignment.

Align the two timing marks (F) on belt rollers (16) with the tool ends 88713.2009.

Check the tensioning and adjust, if necessary, as described in “Checking and adjusting timing belt tension” (Sect. D 5).

Set desired tension and ensure that screws (22), (24) and (12) are tightened to the specified torque (Sect. C 3, Engine torque settings).

Every time a timing part is replaced, it is good practice to check the timing (Sect. N 4.1, Checking engine timing).

Remove the two locking tools (88713.2009) from belt roller flange.

Remove the tool part no. 88713.2011 you used to lock the crankshaft. Unscrew the tool bolt (E).

Tighten the screws to the specified torque (Sect. C 3, Engine torque settings).

Start the screws (5) and the screws (3) in their holes in the cover and tighten to the specified torque (Sect. C 3, Engine torque settings).

Start the screws (3) and the screws (4) in their holes and tighten to the specified torque (Sect. C 3, Engine torque settings).