Re-tightening of Cylinder Head Bolts

the tightening sequence.

• The bolts must now be re-tightened to a certain angle which is 300°. If the disc shown in Fig. 1.46 is used, there will be no problem, i.e. you place the disc between the socket and the tommy bar and with the pointer on “Zero”, tighten the bolt until the pointer reaches “300”. If the disc is not at hand, you will have to set out that three quarters of a turn will give you 270°. The remaining 30° are one third of a quarter of a turn. To sum up, tighten the bolts by 3/4 of a turn and then the remaining 30°. A little confusing perhaps, but is has been tried.

There is no need to re-tighten the cylinder head bolts of these engines.

Re-tightening of Cylinder Head Bolts

As in the case of the original tightening procedure there are also differences between the various engines when the cylinder head bolts are re-tightened.

To end of Model Year 1986

After the vehicle has been driven with the new cylinder head gasket approx. 1300 miles, slacken each bolt in the order shown in Fig. 1.43 (never more than one bolt at a time) and re-tighten it immediately to 2.0 kgm (14.5 ft.lb.).

• Re-tighten each bolt in the order shown in Fig. 1.43 by a quarter of a turn, as described for this engine.
• The valve tappet clearance must be adjusted after the bolts have been re-tightened.

From Model Year 1986 (to April 1989)

The cylinder head bolts of these engines require no re-tightening after a certain mileage has been covered. After the cylinder head bolts have been tightened as described for these engines, tighten them a further 35°. The graduated disc shown in Fig. 1.46 is, of course, a great help. To obtain this angle without the disc, divide half a turn by 6 and tighten the bolts by one segment and a little more. The engine can either be cold or warm (not hot).

• The valve clearances must be checked with the engine cold and again after a mileage of approx. 1200 miles has been covered.

From April 1989

We will mention it. There is no need to re-tighten the bolts. The valve clearances must be adjusted with the engine cold.

1.4. Engine — Servicing and Overhaul

1.4.0. CYLINDER HEAD AND VALVES

1.4.0.0. Technical Data

Cylinder Head:

• Material: Aluminium
• Cylinder head height: 92.5 ± 0.15 mm (3.675 ± 0.006 in.)
• Min. cylinder head height: 92.10 mm (3.659 in.)
• Head surface, max. distortion: 0.10 mm (0.004 in.)
• Identification of cylinder head gasket: According to engine type and number

Valve Guides

• Outer diameter, size 1: 14.02 mm (0.557 in.)