what is the torque specifications of the main bearing cup pistion bearing cup and cylinder head bolt tighteness
Bad are burnt intake or exhaust valve. Pistion rings broken, Burned pistion. Blown head gasket. That is all that would cause no compression are a loss of compression.
Yes, But they have to be put back in the SAME hole/cylinder they came out of. And if you look at the top of the pistion you will see a slot cut in the top of the pistion on one side. That slot points toward the front of the engine.
They open so they can fire the cylinder when the pistion reaches TDC / Top Dead Center.
first pistion on the driver side... ON ANY GM VEHICLE #1 IS ALWAYS THE FIRST SPARK PLUG HOLE ON THE DRIVER SIDE
The most common cycles are the 2 stroke and 4 stroke. One cycle means the pistion inside of the cylinder will move fron one end to the other 2 times in a 2 stroke engine and 4 times in a 4 stroke engine. 2 cycle 1. intake and compression - air/fuel is drawn in and compressed by the pistion moving to the top of the cylinder 2. combustion and exaust - compressed air/fuel is ignited and gases expelled as pistion moves to the bottom of the cylinder 4 cycle (spark ignition engine) 1. intake - exaust valve(s) are closed then the intake valve(s) open and air/fuel is drawn in as piston moves to bottom of the cylinder 2. compression - intake valve(s) close and air/fuel is compressed as piston moves to the top of the cylinder 3. combustion - spark plug ignites the mixture and piston moves to the bottom of the cylinder 4. exaust - exaust valve(s) open and gases are forced out as piston moves to the top of the cylinder There is a lot more to this but I hope I pointed you in the right direction.
Detroit pistion
in the car engine block there are cylinders. in each cylinder theres a pistion. a piston works by exsplosion in the cylinder. that exsplosion comes from the spark plug. then there gas. when the carb puts the air and fuel mixture in the spark plug goes off and it pushes the piston down. then there are valves there are 4 valves on each cylinger. 2 valves are exhust and 2 are the intake valves. the air and fuel mixture come threw the intake and when the air go off there is smoke and the exhust valves open then the smoke goes threw the manafolds and out the tailpipe.
Blow by is caused from the compression rings on the pistion being broken are just worn out. Must tear engine down and replace all of the pistion rings.Nother words engine needs REBUILT.
Drivers side, first one up front.
If the notch on the top of the pistion is pointing to the rear, Then the pistion is installed wrong. If you keep puting the pistions in you will come to one that will no fit on the crankshaft. All notches MUST point to the front.
If it's in good shape, Then all cylinders should read about 150 LBS. Less is okay as long as all of them have no more then 10 LBS. difference between them. If the compression is less then 120 LBS. then the engine has valve or pistion ring problems.
If you look at the top of the pistion you will see a small grove are slot that is right on the edge of the top of the pistion and it is only on one side. That mark,groove,slash,arrow are even a dot means that it points to the front of the engine.