Is fully down, the valve being fully open. 1 cylinder as 1 and 2, the next pair as 3 and 4 up to the furthest pair, 7 and 8. Turn the engine by means of a socket spanner on the crankshaft-pulley wheel, or by jacking up one of the driven wheels, engaging a high gear, and turning the wheel by hand to turn the engine.Ĭount the valves of No. 1 cylinder is usually at the crankshaft-pulley end, irrespective of which way the engine is mounted in the car. With many different sorts of engine layouts, No. The feeler gauge must be a close sliding fit - with the engine hot or cold, according to the manufacturer's instructions.
#Valve check on 250 cg engine manual#
There are some engines - including the Fiesta 1.1 - on which this method is not recommended: consult your car handbook or service manual if in doubt. Carry on until all the valve clearances have been checked.Īn alternative sequence often recommended by car manufacturers for in-line four-cylinder engines, is to follow the 'rule of nine'. Adjust the clearance by tightening the retaining nut to reduce the gap, or loosen it to increase the gap.Īfter re-checking both valve clearances, turn the crankshaft until the next pair of rockers in the sequence rocks, and repeat the check. , each rocker being held by a nut on a fixed pivot post. It has a hexagonal head: adjust it with a spanner. There may be a self-locking adjusting screw with no locknut. When the clearance is correct, hold the screw with a screwdriver while you tighten the locknut, then re-check the clearance. Use a ring spanner to loosen the locknut and turn the screw clockwise to decrease the gap, and the opposite way to increase it.
There may be a slot-headed screw with a locknut. If the rockers pivot on a shaft, the screw is usually at the pushrod end. If not, it may refuse to enter the gap, or it may be a loose fit, in which case you can move the rocker up and down with the blade in place.Īdjust an incorrect clearance with the rocker adjuster screw. If the clearance is correct, the blade is a close sliding fit between the two parts. , selected for the correct clearance, between the rocker and the valve system. Consult your car handbook.īack a short way but if you have gone too far, turn it on almost two more turns in the normal direction and look again.Īt the cylinder to be checked, insert the blade or blades of a , but some Honda engines and the Triumph Acclaim engine turn anticlockwise. Put the cover in a clean place, upside-down on newspaper to catch oil drips. Carefully lift the cover together with its Remove the screws or bolts holding the rocker or cam cover to the cylinder head. In the cylinders, so you can turn the engine easily. Remove all the plugs with a plug spanner. Note the position of any pipes, control cables and other items fastened to the rocker cover, unfasten them and move them aside.
If the leads are clipped down and in the way, unclip them. Leads to avoid confusion when replacing them, then remove them from the plugs, pulling the plug caps, not the leads. But the valves of overhead-cam engines usually have to be checked singly. To speed up the job on most pushrod and some types of indirect-acting OHC engines there is a sequence by which you can check more than one valve at a time. `Cold' means absolutely cold: the engine must not have run for at least six hours - check in the car handbook. `Hot' means that the engine must be warmed to normal working temperature, then switched off - and you must work quickly before the engine cools.
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