Exam 11: Lower-End Theory and Service

Two technicians are discussing the installation of segmented [three piece] oil control rings. Technician A says the ends of the expander/spacer [middle piece] must overlap. Technician B says that the end gaps of all three pieces must be evenly spaced apart. Who is correct?

A used roller lifter can be installed on a new camshaft.

Most pistons used today are made from _____.

The oil hole drilled in the big end of a connecting rod serves to lubricate the piston skirt and ____________________.

Technician A checks crankshaft endplay or end clearance with a feeler gauge. Technician B uses a dial indicator. Who is correct?

Maximum taper for a rod journal is typically ____________________ inch.

How is deck warpage checked?

Old core and oil galley plugs are normally removed and replaced as part of cylinder block reconditioning.

Most cylinder wear occurs at the top of ring travel.

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?

A vibration damper is often called a(n)____________________ balancer.

The bottom ring on a piston is a compression ring.

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?

Hub, inertia ring, and elastomer (rubber)sleeve are parts of a _____.

Where does maximum cylinder bore wear occur?

____________________ shafts are driven by a belt or chain at twice crankshaft speed to reduce engine vibration.

A full floating piston pin _____.

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?

A degree wheel is used to _____.

Describe a basic short block assembly.