Removing and grinding valves
Good engine performance depends on valve condition. Worn guides or stems and burned or badly seated valves allow gas to escape under compression, resulting in poor starting and loss of power.transmission oil seals selling well all over the world.
Valve springs, too, can affect engine performance. Over a period of time they weaken, causing the valves to `bounce’ on their seats as they close.
Removing the valves
Support the cylinder-head assembly firmly on a suitable bench or work surface. See that there is sufficient space to store parts as they are removed, and cardboard boxes and clean newspaper available to keep them clean and safe.cap seal.
Undo the nuts or bolts securing the inlet manifold to the side of the cylinder head; remove it, complete with carburettor if possible.transmission oil seals selling well all over the world.
On some engines, the carburettor is unbolted and removed before you can gain access to the manifold nuts or bolts (See Exhaust manifold gasket replacement).
Put the manifold/carburettor assembly in a clean, safe place preferably on a sheet of newspaper.ring seal.
Similarly, remove the exhaust manifold from the side of the head and place it with the inlet manifold.
On some engines, the inlet and exhaust manifolds are fitted and removed as one unit.
Undo the nuts or bolts securing the thermostat housing to the cylinder head. Ease off the cover and lift out the thermostat.
If necessary, unscrew and remove the temperature-gauge transmitter from the side of the cylinder head.
Wire-brushing the combustion chamber. Cleaning inside the manifold ports. Cleaning the valve head using an electric drill held in a vice.
Wire-brushing the combustion chamber.nok seal.
Cleaning inside the manifold ports.
Cleaning the valve head using an electric drill held in a vice.
Turn the cylinder head on its side and support it on blocks to remove the valves. Place a valve-spring compressor over the valve nearest the front of the head.transmission oil seals selling well all over the world.
Compress the valve spring until the two split, tapered collets round the top of the valve stem can be removed. Take care not to drop them, they are easily lost.
Release the compressor slowly until it is free, then remove the valve-spring assembly and withdraw the valve from the head. Place all the valve parts together for examination later. Discard the oil seals (if fitted).
Repeat the valve-removal procedure on the remaining valves in the correct order, and place the components in their order of removal on a numbered sheet of clean paper, or push them into a piece of cardboard.
Alternatively, use the old cylinder-head gasket to?store the valves in their correct sequence.
Each valve must be refitted in its original position on reassembly, as individual valves, valve guides and valve seats wear in different ways.transmission oil seals selling well all over the world.
Good engine performance depends on valve condition. Worn guides or stems and burned or badly seated valves allow gas to escape under compression, resulting in poor starting and loss of power.transmission oil seals selling well all over the world.
Valve springs, too, can affect engine performance. Over a period of time they weaken, causing the valves to `bounce’ on their seats as they close.
Removing the valves
Support the cylinder-head assembly firmly on a suitable bench or work surface. See that there is sufficient space to store parts as they are removed, and cardboard boxes and clean newspaper available to keep them clean and safe.cap seal.
Undo the nuts or bolts securing the inlet manifold to the side of the cylinder head; remove it, complete with carburettor if possible.transmission oil seals selling well all over the world.
On some engines, the carburettor is unbolted and removed before you can gain access to the manifold nuts or bolts (See Exhaust manifold gasket replacement).
Put the manifold/carburettor assembly in a clean, safe place preferably on a sheet of newspaper.ring seal.
Similarly, remove the exhaust manifold from the side of the head and place it with the inlet manifold.
On some engines, the inlet and exhaust manifolds are fitted and removed as one unit.
Undo the nuts or bolts securing the thermostat housing to the cylinder head. Ease off the cover and lift out the thermostat.
If necessary, unscrew and remove the temperature-gauge transmitter from the side of the cylinder head.
Wire-brushing the combustion chamber. Cleaning inside the manifold ports. Cleaning the valve head using an electric drill held in a vice.
Wire-brushing the combustion chamber.nok seal.
Cleaning inside the manifold ports.
Cleaning the valve head using an electric drill held in a vice.
Turn the cylinder head on its side and support it on blocks to remove the valves. Place a valve-spring compressor over the valve nearest the front of the head.transmission oil seals selling well all over the world.
Compress the valve spring until the two split, tapered collets round the top of the valve stem can be removed. Take care not to drop them, they are easily lost.
Release the compressor slowly until it is free, then remove the valve-spring assembly and withdraw the valve from the head. Place all the valve parts together for examination later. Discard the oil seals (if fitted).
Repeat the valve-removal procedure on the remaining valves in the correct order, and place the components in their order of removal on a numbered sheet of clean paper, or push them into a piece of cardboard.
Alternatively, use the old cylinder-head gasket to?store the valves in their correct sequence.
Each valve must be refitted in its original position on reassembly, as individual valves, valve guides and valve seats wear in different ways.transmission oil seals selling well all over the world.
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