Exam 11: Lower End Theory and Service

Aluminum blocks normally have sleeves or steel liners placed in them to serve as cylinder walls.

Technician A says that a cylinder wall with too smooth a surface will prevent the piston rings from seating properly. Technician B says a cylinder wall should have a crosshatch honing pattern. Who is correct?

Describe a basic short block assembly.

Technician A says engine blocks are made from cast iron. Technician B says engine blocks are made from aluminum. Who is correct?

All the following are types of oil pumps except _____.

Combustion heat, engine oil, and piston movement combine to form a thin residue on the cylinder walls that is commonly called ____________________.

Two technicians are discussing undersized bearings. Technician A says a 0.001 in. or 0.002 in. bearing can be used on a stock crankshaft journal if the oil clearance [difference between the bearing diameter and the journal diameter] is slightly excessive and the journal is not excessively tapered or out of round. Technician B says 0.010 in., 0.020 in., and 0.030 in. undersized bearings are only used when the crankshaft journals have been reground. Who is correct?

Each half of a split bearing is made so that it is slightly greater than an exact half. What is this extension called?

Most camshafts on overhead valve engines use ____________________-piece bearings.

A degree wheel is used to _____.

A cylinder bore can be checked for out-of-roundness with a _____.

Hub, inertia ring, and elastomer [rubber] sleeve are parts of a _____.

Technician A says that the oil pump is driven directly by the crankshaft. Technician B says on some older engines the oil pump is driven by the distributor. Who is correct?

Technician A says piston ring grooves should be cleaned with a piston ring groove cleaner. Technician B says piston ring grooves should be cleaned with a broken piston ring. Who is correct?

Technician A uses a micrometer to measure the connecting rod journal for taper. Technician B uses a micrometer to measure the connecting rod journal for out-of-roundness. Who is correct?

Most cylinder wear occurs at the top of ring travel.

Which operation must be performed before removing the pistons from an engine?

What tool is required to remove a dished-type core plug?

Technician A says the maximum amount of cylinder out-of-roundness allowed in most cases is 0.0015 in. (.038 mm). Technician B says that a cylinder can have a taper of up to 0.010 in. (.254 mm) and be acceptable. Who is correct?

Longer-duration camshafts improve low-speed power but weaken high engine speed performance.