Asked in Uncategorized
If cam belt snapped in my 1996 laser is there enough clearance between piston and head?
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In an engine, the piston's go up and the valve's that are adjacent to that piston go up. When the piston goes down the adjacent valves go down. This is achieved by the timing belt or chain and the engine timing being set correctly. If the belt or chain breaks, the pistons still go up and down, but the valve's stop moving. On a non clearance engine, the piston will go up and hit the valves, resulting in bent valves and a now needed head job. In a clearance engine, the top of the piston has an inset cut into it that is just enough room to avoid hitting the valves.
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The clearance between piston and cylinder walls is much larger than you might think; perhaps .05" or even more. The reason for such a large gap is partly manufacturing tolerances, but even more because of differential expansion of piston and cylinder as the engine first starts up and heats up. Both problems are solved by making the piston undersized and machining three or more rectangular section grooves around the outer surface of the piston. A hardened steel ring fits into each groove; it is sprung such that it presses against the cylinder wall. These piston rings take up the difference in diameter between piston and cylinder, and automatically compensate for differential expansion. They also take up wear as the engine ages. Another bonus is that the piston itself does not rub against the cylinder wall. The resistance to wear which is necessary for long engine life comes from the hardened steel rings. The piston does not have to be made of hardened steel, and many are actually made from aluminium.
Asked in Technology
Meaning of cam ground of piston?
Aluminum expands much more than Cast Iron, so when the piston to cylinder wal clearance is measured at room temperature there must an allowance to allow for expansion when the piston heats up. The amount of clearance depends upon the design of the engine and the anticipated operating temperature. Air-cooled engines run very hot so they require more clearance than water-cooled engines. On a Cushman piston the reference point for more clearance than water-cooled engines. On a Cushman piston the reference point for clearance measurements is at the top of the skirt perpendicular to the piston pin All areas of the piston do not expand the same; the top of the piston runs the hottest so it expands the most. The skirt runs the coolest so it expands the least. For this reason the diameter at top of the piston will normally be smaller, and the diameter at the bottom of the skirt will normally be a little larger, than the diameter at the top of the skirt. Also, the piston does not expand the same all the way around its circumference. The diameter measured across the piston pin will expand more than the diameter-measured perpendicular to the piston pin. Therefore, the piston is "cam ground", or made slightly oval, with the smaller diameter measured across the piston pin. When the piston heats up to operating temperature it will then be round. If the piston were not cam ground, the to operating temperature it will then be round. If the piston were not cam ground, the piston to cylinder wall clearance would have to be extremely high when the engine was cold to allow for expansion, and it would not be round when at operating temperature. This could cause piston slap and other problems. piston to cylinder wall clearance would have to be extremely high when the engine was cold piston to cylinder wall clearance would have to be extremely high when the engine was cold to allow for expansion, and it would not be round when at operating temperature. This could cause piston slap and other problems Cushman engines are usually set to a clearance of about .006 inch measured at the reference point described in paragraph one. The clearance at operating temperature will be much less, and if sufficient allowance is not made for expansion, the piston will expand to much less, and if sufficient allowance is not made for expansion, the piston will expand to the diameter the cylinder wall and freeze up. During break-in everything is running extra the diameter the cylinder wall and freeze up. hot due to the increased friction, and the piston temperatures get very high. If the engine is run at high speeds during this period it will almost always freeze up and may damage the run at high speeds during this period it will almost always freeze up and may damage the engine The following measurements are from a Cushman NOS +.030 cam ground piston Top of skirt perpendicular to the piston pin 3.024 (.006 clearance) Top of skirt measured across piston pin 3.011 Bottom of skirt perpendicular to pin 3.025 Bottom of skirt parallel to piston pin 3.012 Top of Piston and ring lands 3.005 In this case the clearance to a nominal 3.000 inch cylinder bore is .006 inch, the elliptica amount is .013, the skirt is .001 larger at the bottom than at the top, and the top of the piston is .019 less than the widest point on the skirt. These measurements are for llustration only and individual pistons may vary considerably
Asked in Chrysler LHS
Is the 2000 Chrysler LHS 3.5 l engine a interference engine?
According to my research on the Gates timing belt website, the engine is an interference engine. The belt should be changed every 60,000 miles (100,000 km). If the belt has broke, normally a valve has been bent and a piston could be damaged. There is not enough clearance between the piston and valve to allow for them to work out of time with each other.
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Asked in Cars & Vehicles, Symptoms
How is the piston to bore clearance measured in an engine that is being rebuilt?
There are several ways. You can: Use a long feeler gauge and see if the piston has clearance in excess of the size, usually you use several in succession to determine clearance to + or - .001 inch or .01 MM Use a Micrometer and bore gauge that have been properly calibrated. There are other ways but those are the most common.