AUTOMOTIVE MACHINING &
ENGINE REPAIR QUESTIONS AND
THEIR EXPECTED ANSWERS
Tolerance limits are used in the automotive industry
for?
Bearing bore and crank journal diameters
Machinist A says that tolerance limits specify high
and low limits of clearance. Machinist B says that they
specify high and low limits of size. Who is right?
B only
Machinist A says that precision assemblies are
economically manufactured by reducing tolerances on
individual parts. Machinist B says that such
assemblies are more economical if selectively fitted.
Who is right?
B only
An example of unilateral tolerance is
plus .001 in, minus .000 in
An example of bilateral tolerance is
plus or minus .001in
A piston is specified to fit a 4.030 inch bore with
minimum clearance or as much as .0005in more. The
tolerance on piston diameter is
plus .000, minus .0005in
Machinist A says that aluminum expands .000006in
per inch per degree F. Machinist B says that iron or
ENGINE REPAIR QUESTIONS AND
THEIR EXPECTED ANSWERS
Tolerance limits are used in the automotive industry
for?
Bearing bore and crank journal diameters
Machinist A says that tolerance limits specify high
and low limits of clearance. Machinist B says that they
specify high and low limits of size. Who is right?
B only
Machinist A says that precision assemblies are
economically manufactured by reducing tolerances on
individual parts. Machinist B says that such
assemblies are more economical if selectively fitted.
Who is right?
B only
An example of unilateral tolerance is
plus .001 in, minus .000 in
An example of bilateral tolerance is
plus or minus .001in
A piston is specified to fit a 4.030 inch bore with
minimum clearance or as much as .0005in more. The
tolerance on piston diameter is
plus .000, minus .0005in
Machinist A says that aluminum expands .000006in
per inch per degree F. Machinist B says that iron or
