Where should the piston be positioned when removing a cylinder?
If an engine cylinder is to be removed, at what position in the cylinder should the piston be? When removing a cylinder from an aircraft engine, rotate the crankshaft until the piston is at top center on the compression stroke. In this position, the pushrods can be most easily removed.
What causes the piston to be pushed up the cylinder?
Combustion occurs, expanding gases drive the piston down and turn the crankshaft which pushes the piston back up the cylinder.
What causes piston problems?
Faulty piston rings can be as a result of: incorrect installation, improper dimensions, fuel flooding, inadequate combustion of the fuel/air mixture, worn ring groove, abrasive particles in the oil, and tiny chips left after machining or reconditioning the engine.
How do you diagnose a bad piston?
Here is a list of the most common symptoms for bad piston rings:
- White or gray exhaust smoke.
- Excessive oil consumption.
- Low power for acceleration.
- Overall loss of power or poor performance.
What is the movement of a piston up or down?
Combustion cycle: Pistons are always moving up and down, as a piston moves upward, it compresses the air and fuel in the combustion chamber. Once this happens, the spark plug is used to ignite the fuel and air, and the resulting explosion pushes the piston back down.
What is the movement of the piston compression?
The downward movement of the piston causes the air and fuel to be sucked into the cylinder. Compression Stroke: The next is the compression cycle where both the intake and exhaust valves are closed. The upward movement of the piston causes the air-fuel mixture to be compressed upwards towards the spark plug.
What happens when a piston fails?
The symptoms of a piston failure can include engine noise (rattling or knocking noises while the engine is idling), oil burning, misfiring and loss of power. But a fuel or ignition problem won’t cause engine noise or blue smoke in the exhaust. Loss of compression also can cause a misfire and a loss of power.
Can you change piston rings without removing the head?
Yes it will. Really bad rings will instantly show low compression. Then pour a few tablespoons of oil down the spark plug hole and the compression will get better.
How are pistons measured on a Volvo engine?
All pistons must be measured at TDC. Piston height above the Volvo engine block must be measured at measuring points (1) and (2) on all pistons. Pay attention to the measuring points, since the piston crown is domed. 16 Check that the piston is in its uppermost position, TDC. Place the dial indicator on the piston at measuring points (1) and (2).
How to check a Volvo engine cylinder head?
Pay attention to the measuring points, since the piston crown is domed. 16 Check that the piston is in its uppermost position, TDC. Place the dial indicator on the piston at measuring points (1) and (2). Read off and note the value on the dial indicator.
How does piston cooling work on a Volvo truck?
Piston cooling is set in motion when the oil pressure is sufficient to open the piston cooling opening valve in the cylinder block. The oil is then forced through the engine block drilled galleries into the piston cooling nozzles for piston cooling.
What causes a piston on a hydraulic cylinder to drift?
As previously stated, if the piston seal leaks, unequal volumes of oil on the rod and piston sides of the cylinder indicates hydraulic lock will prevent any noticeable drift.