how do you measure a pistons diameter in a typical four stroke engine?

Question

A) do you measure it at the top (around the crown where the piston rings are?
B) do you measure it at the top of the skirt area (beneath the rings and seals)
C) across the center where the rod connecting journal is
D) at the lowest part, at the skirt

Answer 1

you should be measuring at the same level as the piston pin and at right angles to the pin on the piston skirt. Most pistons are made a bit out of round to take care of differences in expansion across the pin bosses and also to deal with side pressure from the connecting rod thrust.

Answer 2

B) and C) B):Measure piston for size; Measure piston 3/16" below cross slot, perpendicular to piston pin. C):Measure piston for taper, the largest reading must be at the bottom of the skirt. Allowable taper is .000-.0001 inch. (Cadillac V8-350)

Answer 3

The flywheel keeps the momentum of the engine going so because of the fact the cylinder can finished the different 3 strokes in the previous the subsequent means stroke happens. What makes the crankshaft turn is the piston and the piston rod. The rod connects the piston to the crankshaft and it rather is what turns the up-and-down action of the piston into the around action of the crankshaft.

Answer 4

across the top of the piston... if you are checking the piston there are several measurments you can make depending on the manufacturer... many pistons are designed to change shape as they expand and have basic measurments cold and expand to better ride in the cylinder at operating temperatures...

Answer 5

I measure all to be sure that it is not distorted,usually there is variation.Top of piston is more true diameter

Answer 6

Around the crown.

Answer 7

With a micrometer or just wrap a tape measure around it

LOL, sorry I'm a machinist....shop joke!!