CYLINDER HEAD-E.1 NOTE: Valve springs incorporate a damper coil and care should be taken to ensure that this damper coil is to the bottom of the spring i.e., nearest the cylinder head when fitted. Inner valve springs are not required for engines rated at 3,000 rev/min and below. 4.108 engines and 4.99 vehicle engines are fitted with rubber sealing rings on inlet valves only. All latest 4.107 and 4.99 agricultural and industrial engines incoroporate oil deflectors on both inlet and exhaust valves.
In the case of earlier 4.107 and 4.99 agricultural and industrial engines which incorporate rubber sealing rings on the inlet valves only, oil deflectors should be fitted to both inlet and exhaust valves after the valve assembly has been dismantled. With this arrangement, a different valve spring seating washer is required for exhaust vales. Where a groove is cut on the inlet valve stem, a rubber sealing washer should be fitted in addition to the de- flector to stop the later from becoming canted on the stem. Oil deflectors should not be fitted to 4.99 vehicles and some 4.108 engines. 1 II F"t---2 ---_ 3 CYLINDER HEAD GASKET Always use a new cylinder head gasket.
Ensure that the correct type is used. 4.108 Engines With this engine, the gasket is made of a black com- posite material and is known as the Klinger type. It MUST be fitted DRY and on no account should joint- ing compound be used. It is very important that the gasket is placed correctly, otherwise the steel beading may be nipped between the cylinder head face and the top of the liner. 4.107 and 4.99 These engines use a copper and asbestos or a copper, steel and asbestos gasket. These gaskets should be fitted with a light coating of Perkins (Hylomar) jointing compound on both sides. 6 7 8 To Rem Cylinder Head 1.
Place the cylinder head gasket carefully in posi- tion on the cylinder block face (the gasket is marked "TOP FRONT" to indicate how it should be fitted). (Refer to Fig. E.22). 2. Lower the cylinder head into position on top of the gasket ensuring that it lays perfectly level. 3. Lightly lubricate both cylinder head studs and nuts with engine oil, then tighten the nuts progressively in three stages in the sequence shown in Fig. E.23 to the torque given on page B.2. This final torque tightening stage should be repeated to ensure that no loss of tension has taken place on any studs earlier in the sequence. E19 1. Retaining Collets 2. Spring Caps 3. Inner Valve Springs 4. Outer Valve Springs 5.
Spring Seating Washers 6. '0' Sealing Ring (Inlet Valves only) 7. Inlet Valves 8. Exhaust Valve With current engines, washers are fitted under the cylinder head nuts which necessitates longer cylinder head studs. The cylinder head tightening torque re- mains unaltered.