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bumping clearance is the clearance between piston and head ,piston and crank endside
most auto mechanic preferred .002 clearance from piston skirt to sleeve
Piston ring gap.
0.003" ~ 0.004"
Piston is the device with a cup like shape that fit completely in the Cylinder.
The volume between the engine head and piston when the piston is in the head dead center piston R - is expressed in cubic inches
It is the space between the top of the piston and the bottom of the cylinder head. Great care should be used when putting an engine back together to make sure the bump clearance is not 0 so that the piston will not hit the head cylinder.
The 1999 Ford Ranger 3.0L V6 engine has a no-interference design. This means that?æ there is enough clearance between the piston and the valves. Therefore, when the timing belt fails, no damage will occur to the engine.
excessive piston to bore clearance means that the gap (tollerance) between your piston and the sidewall of your cylinder/block is too large. usually will cause blow-by. the burning of oil, and dark exhaust smoke. also may cause the engine to have a weak compression stroke
Push in the piston on the caliper with your hand or a vice grips to get more clearance.
the pistons most likely have zero clearance in the between the piston heads and the valves. When the timing goes out on a vehicle with zero clearance, the piston heads hit the valve heads, thereby bending the valve stems.
Well...... you need A LITTLE bit of clearance for the gas mixture to lubricate the piston and cylinder. Plus your piston expands when it gets hot.