Adjust valves clearance on your engine ρύθμιση διακένου βαλβίδων κινητήρα Yiannis Pagonis

Checking and adjusting valves
Valve clearances are the small gaps between the tops of the valve stems and the part of the mechanism which presses on them to open the valves.
Check the clearances at regular intervals as specified in the car service schedule, and adjust if necessary. Reset the clearances whenever the cylinder head has been removed.
The job is commonly called adjusting the tappets.
Pivot post
Adjusting nut
Measure here
Rockers on a pivot post
On a pushrod engine without a rocker shaft, the clearance is adjusted by a nut on the pivot post; this example has a self- locking nut.
A few cars have hydraulic tappets, which are self adjusting and do not need checking.
Before starting, make sure you know the type of valve mechanism commonly called valve gear - fitted to your engine, and the relative valve clearances. The car handbook should tell you the clearances - if not, consult a dealer or the car service manual.
The valve gear fitted to your engine will be either pushrod (OHV) or overhead camshaft (OHC) (See The engine - how the valves open and close). There are two types of OHC valve gear direct acting and indirect acting.
The tappets on an OHC engine are usually adjusted by placing shims of a predetermined size under them.
That is a job best left to a garage which has a micrometer for measuring shims, and a wide selection of them. But you can check the clearances yourself, and decide whether they need adjusting.
You must know the firing order of the engine, which cylinder is No. 1, which are inlet and exhaust valves and which rockers or cams operate them. Make a plan of all this information on paper.
Find the correct valve clearances for inlet and exhaust valves, and whether they should be adjusted with the engine hot or cold.
Direct-acting overhead cam
A direct acting OHC separates the valves through tappets which are sometimes adjusted by shims.
`Hot' means that the engine must be warmed to normal working temperature, then switched off - and you must work quickly before the engine cools.
`Cold' means absolutely cold: the engine must not have run for at least six hours - check in the car handbook.
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. But the valves of overhead-cam engines usually have to be checked singly.
Remove the air cleaner if it overhangs the rocker cover (See Air filter change).
Tag and number the ignition leads to avoid confusion when replacing them, then remove them from the plugs, pulling the plug caps, not the leads. If the leads are clipped down and in the way, unclip them.

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