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21 Cards in this Set
- Front
- Back
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Briefly explain the purpose of the camshaft |
The camshaft changes rotary motion into reciprocating motion and also controls the opening and closing of the intake and exhaust valves |
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Identify two types of cam arrangements |
Cam in block arrangement Overhead cam arrangement |
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The camshaft gear is small than the crankshaft gear on a four stroke engine |
False; because it rotates slower |
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Identify the four components in a valve train |
Camshaft Lifter Pushrod Rocker arm |
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What speed does the camshaft rotate in relation to the crankshaft on a four stroke engine |
The camshaft rotates at 1/2 the speed of the crankshaft |
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List three types of cam followers |
Solid Roller Hydraulic |
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What keeps the camshaft timed with the crankshaft |
Gears, chain or Timing belt |
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Pushrods may have hollow tubes with oil galleries so oil can be sent to the cylinder head |
True |
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Which valve train component makes up the mechanical link between the pushrod and valve |
Rocker arm |
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Depending on engine design, the cylinder head may cover |
One, four or six cylinders |
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Explain the purpose of the cylinder head ports |
The cylinder head ports direct flow in and out of the cylinders |
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List the three main functions of the cylinder head |
Retains the gasket seal between the block and head Contains a combustion chamber, valves, oil and coolant galleries Houses the manifolds and injectors, air start and gas admission valves |
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List the two basic functions of valves |
Seals the cylinder during compression and power events Permits air/fuel mix on intake and removes combustion gases on exhaust |
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Briefly explain why an exhaust valve is usually made of higher quality material than an intake valves a solid stem valve |
It operates at a higher temperature and is subject to corrosive gases flowing through |
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On a solid stem valve, the majority of the cooling takes place at the |
Valve face and valve seat |
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When compared to an integral valve seat, valve seat inserts provide a replaceable wear surface with improved |
Wear characteristics |
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Valve seals control valve guide and stem lubrication to prevent |
Oil consumption |
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Before removing the cylinder head from a locked out and purged engine , you must do which task first |
Drain the coolant and oil |
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After replacing valves and valve seat inserts, you should always check |
The valve face and valve seat contact |
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Which valve type usually requires more clearance? Why? |
A exhaust valve requires additional clearance over the intake valve due to high exhaust gas temperatures flowing through the valve and valve seat |
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When adjusting valve lash using the firing order of an engine, the piston should be positioned at TDC and in the compression stroke with both valves closed for that cylinder |
True |
