From Model Year 1986

be re-tightened after a certain mileage as described below.

From Model Year 1986

• Slacken all cylinder head bolts in the reverse order to the one shown in Fig. 1.43 and tighten them in numerical sequence to 2.0 kgm (14.5 ft.lb.).

Fig. 1.45. — Angle-tightening the cylinder head bolts when the anlge is 180°. The socket (i) must be marked as shown.

• Place the socket with a tommy bar over the bolt No. 1 and mark the bolt head as shown in Fig. 1.45. Tighten the bolt by half a turn. This is shown by the illustration by the 180°. Arrange the tommy bar parallel with the long side of the cylinder head and tighten the bolt until it is once more parallel, but on the other side of the head. This will give you the 180°.
• Tighten the remaining cylinder head bolts in the order shown in Fig. 1.43. Read the not above if you have omitted one of the bolts during the angle-tightening.

The cylinder head bolts must be re-tightened as described below after the initial torquing, but not after a certain mileage, as is the case on engines to the end of model year 1986.

From April 1989

Cylinder head bolts with a so-called “Torx” head are used on these engines. If the cylinder head bolts have the shape shown in Fig. 1.46, tighten the bolts in the manner described below. You will also need a graduated disc, also shown in Fig. 1.46, but the description below will show you how to carry out the operation without one.

Fig. 1.46. — The graduated disc is used to re-tighten the cylinder head bolts to any of the angles required. Cylinder head bolts for engines after April 1989 have a “Torx” recess.

Fig. 1.46. — The graduated disc is used to re-tighten the cylinder head bolts to any of the angles required. Cylinder head bolts for engines after April 1989 have a “Torx” recess.

• Tighten the bolts in the order shown in Fig. 1.43 to 6.0 kgm (43.5 ft.lb.). Only use a “Torx 55” insert to prevent damage to the bolt heads. “Torx” socket inserts are available in sets containing various sizes, but make sure a “55” is included.
• Slacken all bolts in reverse order and re-tighten them to 2.0 kgm (14.5 ft.lb.)