Cylinder Head Assembly
In order that you achieve the maximum performance from the product it is essential you follow these guidelines. Please make sure you read them thoroughly and fully understand the procedures before commencing the fitting of the cylinder head. Fitting the Hydraulic Lifters and camshafts The cylinder head comes assembled with the valves and springs installed; it is the end user who must build the completed cylinder gead. Place the cylinder head, gasket face down on a pair of blocks so the gasket face is raised slightly. As you fit the hydraulic lifters and camshafts the valves will open and it is very important they do not contact anything as this will cause valve/valve guide damage.
(1) Remove the camshaft bearing caps from the cylinder head – you will notice that these have an arrow on them that points to the front of the engine and are all numbered. It is very important to remember the location of each cap.
(2) Insert the hydraulic Lifters into their bores, liberally oiling the bore and outer surface of the lifter. Place all 16 in their bores.
(3) Cover the lobes of the camshaft and tops of the hydraulic lifters & bearing surfaces with a light coating of Moly-grease then lay the inlet camshaft in position within the cylinder head and replace the appropriate cam bearing caps, noting their numbering sequence from the removal.
(4) Slowly and evenly tighten each cam bearing cap as per the workshop manual to the specified torque (14 N-m). As you do this you will notice the valves opening on the cylinder head.
(5) Repeat the above procedure for the exhaust camshaft.
(6) The cylinder head must now be left for at least 24 hrs to allow the hydraulic lifters to ‘settle’ and the valves to close. This is very important – if the cylinder head is fitted straight to the engine you will damage the valves and guides in the cylinder head.
(7) Once the lifters have settled (24 hrs) rotate the camshaft and check the valves are opening and closing correctly. Once this check has been carried out the thermostat and water take off housings to the front and rear of the cylinder head can be attached and the cylinder head can be fitted to the engine using the procedure outlined in the Workshop manual. (We highly recommend the use of a steel head gasket).
(8) Due to the fact that the cylinder head has been skimmed they can be ‘troublesome’ when fitting the cam belt and timing the camshafts – this is critical and a single tooth error on the cam sprocket will cause piston to valve contact. Ensure there are 19 teeth on the cambelt between the two top marks on the cam pulleys and that the marks point vertically upwards when the engine is at top dead centre.
(9) Whilst we do everything we can to ensure no ‘foreign matter’ from the machining processes remains in the cylinder head we recommend running the engine for 15 minutes then performing an oil & filter change to flush out any swarf that may have been missed. (If you have purchased a new Short Motor at the same time follow the oil change instructions that were supplied with this).
The cylinder head will require some running before optimum performance is reached as the valves ‘bed in’ to their new seats.