Chapter 11 Terms & Questions

3 types of Cam Drives

Belt, chain, gear

Chamfered

a taper at the end of a hole

After installing cam bearings: Technician A checks that the oil holes in the bearings are properly aligned with those in the block by squirting oil into the holes. Technician B checks for proper alignment by inserting a wire through the holes. Who is correct?

Both A and B

Most pistons used today are made of ________ . a. Cast iron b. Aluminum c. Ceramic d. None of these choices

b

What device in the valve train changes rotary motion into reciprocating motion? a. Eccentric b. Cam c. Bushing d. Mandrel

b

Split bearing

bearing made of two parts (e.g. crankshaft bearings)

Which of the following is not of concern when checking a piston? a. Diameter b. Surface finish c. Groove wear d. Pin boss wobble

c

Which type of oil ring is slotted so that excess oil can pass through it? a. Cast iron b. Neither of these choices c. Both Cast Iron and Segmented d. Segmented

c

2 types of VVT

continuous (can change timing), staged (can change lift)

Short block

cylinder block without cylinder head

The connecting rod journal is also called the ________ . a. Balancer shaft b. Vibration damper c. Plastigage d. Crankpin

d

Piston rings

go around piston and help with compression and oil application

Flywheel

heavy circular component that helps crankshaft turn

Valve lifters

hydraulic or mechanical device in valve train that rides of camshaft lobe to help lift valve off its seat

Babbitt

material that lines steel flat bearings

What to check for in Journal Inspection *info*

out of round and taper

Overlap

period when the intake and exhaust valves are open at the same time

Piston pin

pin to connect piston to connecting rod

Flexplate

round flywheel like disc mounted to an engines crankshaft in an automatic trans

Cam follower

the device that moves the camshaft in an OHC engine to transmit the movement of the cam lobes to the valve train.

Ring lands

the high part of piston in between the grooves

Duration

the length of time something occurs or happens

Backlash

the play among two parts, such as meshed gears

Forge

the process of shaping metal by stamping it

Dome

the shape of the top of the piston

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

Both A and B

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?

Both A and B

What type of valve lifter automatically compensates for the effect of engine temperature? a. Hydraulic b. Solid c. Roller d. All of these choices

a

Full-round bearing

a one piece bearing commonly used on camshafts

Balance shafts *info*

also called silence shafts, used to reduce engine vibration, counterweights mirror the throws of the crankshaft, rotates opposite crankshaft rotation, inspected and serviced as part of engine reconditioning

Hone

an abrasive for correcting small irregularities in cylinder diameter

Line boring

an operation in which the main bearing housing bores are rebored in perfect alignment

Cam bearings in OHV engines are typically which type? a. Split insert b. Full-round c. Thrust d. None of these choices

b

Each half of a split bearing is made slightly larger than an exact half. What I this called? a. Spread b. Crush c. Both Spread and Crush d. Neither Spread nor Crush

b

Long Block

short block with a cylinder head

Deck

the top of the engine block where the cylinder head mounts

Glaze

thin residue found on piston walls formed by heat, oil and fuel and piston movement

True or False? Cylinder taper is the difference in a cylinder's diameter between the bottom of the cylinder bore and the top of the bore just below the ridge.

true

3 types of lifters

Hydraulic, solid (requires a clearance between parts of the valve train), roller

Technician A checks crankshaft oil clearance with a feeler gauge. Technician B uses a dial indicator to check crankshaft oil clearance. Who is correct?

Neither A nor B

Technician A says that piston ring end gaps should be the same for each ring on a piston. Technician B says that piston ring end gaps should be aligned before installing the piston into its bore. Who is correct?

Neither A nor B

Technician A uses a pry bar to stretch the timing chain onto its sprockets. Technician B cools the timing sprockets so that the timing chain will slip over the teeth. Who is correct?

Neither A nor B

Camshaft Bearings *info*

OHV engines are one piece bearings pressed into the camshaft bore

Technician A installs a cup-type core plug with its flanged edge outward. Technician B installs a dish-type core plug with the dished side facing inward. Who is correct?

Tech A

Technician A says that crankshaft counterweights offset the weight of the connecting rods and pistons. Technician B says that crankshaft counterweights are used to dampen crankshaft torsional vibrations. Who is correct?

Tech A

When removing the balance shaft assembly: Technician A inspects the bearings for unusual wear or damage. Technician B smoothens a damaged camshaft or balance shaft journal by lightly sanding it. Who is correct?

Tech A

When removing the piston and rod assemblies from a cylinder block: Technician A positions the throw of the crankshaft at the top of its stroke and removes the connecting rod nuts and cap. Technician B covers the rod bolts with protectors and pushes the piston and rod assembly out with the wooden hammer handle or wooden drift and supports the piston as it comes out of the cylinder. Who is correct?

Tech B

Wrist pin

a pin used to connect the piston to the small end of a connecting rod

Core Plug

a plug used to seal holes that were need during casting

Variable valve timing (VVT)

a system that controls intake valve timing

Hypereutectic

a type of piston they offer low thermal expansion, improved groove wear, greater strength to scuffs, heat resistance

Plastigage

a wax to measure bearing clearances

Harmonic Balancer

also called damper, cancels out crankshaft vibration by using counterweights