Pistons
Rings
Cranks
Valves
Cams & Blocks
100
This is the portion of the cylinder block in which the piston moves.
What is Cyldinder Bore (Or Bore.)
100
This is the number of rings featured on our sample piston.
What is 3.
100
The crankshaft should rotate this direction in relationship to the flywheel.
What is clockwise.
100
This valve is generally the largest.
What is the exhaust valve.
100
This is the portion of a cam which opens and closes the valve.
What is the cam lobe.
200
The notch on the top of the piston should be directed towards this rotational feature.
What is insthe flywheel.
200
This is the feature on a top compression ring that helps force it agains the cylinder wall.
What is the inside bevel.
200
This journal often features a bevel which will accept the flywheel.
What is the magneto journal.
200
This part of the block helps a valve to travel smoothly up and down.
What is the valve guide.
200
These must be lined up in order for the engine to run properly.
What is the timing marks.
300
This is the lower portion of the piston, and can be flat or rounded.
What is the skirt.
300
This middle ring has openings or "windows" which allow oil to drain back into the sump.
What is oil ring.
300
This journal is where we would find pullies and sprockets attached.
What is the PTO (or Power Take Off) Journal.
300
This small piece of metal holds the spring onto the valve.
What is the valve retainer or keeper.
300
This finned part is torqued onto the end of the block to create the combustion chamber.
What is the head.
400
This is the metal most of our Briggs & Stratton Pistons are made of.
What is aluminum.
400
This is another name for the bottom compression ring.
What is the scraper ring.
400
This journal is offset from the other two and does most of the "work" of the engine.
What is the crankpin journal.
400
This machined area on the end of the valve stem accepts the keeper.
What is the valve retainer groove.
400
For each rotation of the camshaft, the crank rotates this many times.
What is two.
500
This is the term for the brackets which accept a wrist pin on the under side of the piston.
What are pin bosses.
500
This is the tool used to install rings on a piston.
What is the ring compressor.
500
This small ring slides onto the crankshaft and engages with the cam.
What is the timing gear.
500
This optional part helps a valve to spin around, reducing stress from heat and wear.
What is the spring rotator.
500
This cheap piece of soft metal is cheap insurance against damaging your engine beyond repair.
What is the flywheel key.
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