Piston and Connecting rod service pg 207 Flashcards

1
Q

Give a brief explanation of why cylinder ridge must be removed before pushing the piston and connecting rod from the cylinder.

A

The piston rings will catch on the ridge, making the piston difficult to remove and possibly damaging the piston and rings.

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2
Q

List two safety precautions when using a rotary wire brush to remove a carbon ridge from a cylinder.

A

A. Wear eye protection

B. Make sure that the wire brush is suitable for the speed of the tool turning it.

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3
Q
In preparation for piston and connecting rod removal, the piston to be removed should be positioned at:
A. TDC.
B. 90 Degrees BTDC
C. 90 Degrees ATDC
D. BDC
A

D. BDC

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4
Q

Explain why it is necessary to remove the piston cooling nozzles from some engines when removing and installing some piston and connecting rod assemblies.

A

To prevent damage to the piston cooling nozzle.

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5
Q

When removing and installing piston rings, a ring expander should be used to:
A. Expand the rings to their maximum diameter.
B. Prevent piston and ring damage.
C. Keep the rings in order.
D. Position the ring gaps.

A

B. Prevent piston and ring damage.

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6
Q

List the parts of the piston that should not be bead blasted.
A.
B.
C.

A

A. Ring grooves
B. Skirt
C. piston pin

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7
Q

When scraping carbon from the rings grooves of a piston, care must be taken to ensure that:

A

When scraping carbon from the ring grooves of a piston care must be taken to ensure that metal is not removed from the ring groove area.

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8
Q

What tools should be used to measure the wear in a keystone piston ring groove?

A

ring groove wear gauge

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9
Q
Pistons should be visually inspected for signs of:
A.
B. 
C.
D.
A

A. Cracks in the crown, skirt and piston pin bores.
B. Scuffing and scoring on the skirt, ring lands and crown.
C. Signs of wear or erosion in the ring grooves.
D. Looseness or de-bonding of inserts (for example ring grooves)

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10
Q
The skirt of a piston should be measured at a point midway down the skirt and \_\_\_\_\_\_ to the piston pin bores.
A. 30 Deg
B. 45 Deg
C. 90 Deg
D. 180 Deg
A

C) 90 Degrees

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11
Q

List three problems that will occur with worn piston ring grooves.
A.
B.
C.

A

A. Blowby
B. Oil consumption
C. Broken Piston rings

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12
Q

Calculate the piston clearance using the following measurements:
Piston Skirt Dia: 4.9985”
Cylinder bore diameter: 5.0017

A

0.0032”

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13
Q

What would be the result of a piston installed with insufficient clearance between the skirt and the cylinder wall?

A

Scuffing/scoring and eventual piston seizure.

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14
Q

Piston rings should be measure to determine:
A. Maximum outside diameter and taper.
B. Minimum outside dimension and taper.
C. Maximum outside dimension and out of round.
D. Minimum outside dimension and out of round.

A

D. Minimum outside dimension and out of round.

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15
Q

Calculate the piston pin clearance using the following measurements:
Piston pin diameter-2.4997”
Piston pin bore diameter-2.5012”

A

0.0015”

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16
Q

List the methods that can be used to check a connecting rod for cracks.

A

A. Dye Check
B. Magnetic particle
C. Fluorescent Magnetic particle.

17
Q

List the three measurements that can be made to determine the condition of the large end bore of a connecting rod.
A.
B.
C.

A

A. Bore Size
B. Out of round.
C. Taper

18
Q

A bent connecting rod will cause:
A.
B.

A

A. Uneven wear and loading on the conncecting rod journal and bearing, piston crown and skirt, piston pin and bores.
B. Reduced compression ratio.

19
Q

Unless otherwise specified by the manufacturer, when installing a full floating piston pin, you should install the gap in the snap rings:
A. Towards the bottom of the piston skirt.
B. Towards the crown of the piston.
C. 90 Degrees to the piston pin.
D. Towards the side of the piston skirt.

A

A. Towards the bottom of the piston skirt.

20
Q

A full floating piston pin that has a slight interference fit at room temperature should be removed or installed by:
A. Using a hammer and a drift to drive the pin into position.
B. Heating the piston in boiling water or an oven.
C. Using a hydraulic press to push the pin into position.
D. A firm push with your hand.

A

B. Heating the piston in boiling water or an oven.

21
Q

Briefly explain how to position a piston ring in a cylinder bore to measure end gap.

A

Push each piston ring squarely into an unworn area of the cylinder bore.

22
Q

What would be the result of piston rings being installed with insufficient piston ring end gap?

A

Piston ring would seize up in the bore.

23
Q

Briefly explain why piston ring end gaps must be staggered before the piston is installed in the cylinder.

A

To limit the amount of cylinder pressure, combustion gas and oil leakage that can pass by the rings during engine operation.

24
Q

When installing connecting rod bearing shells in the rod and cap is is important to check the:
A. Alignment of the piston and connecting rod.
B. Alignment of the locating tangs and oil holes.
C. Bearing clearance with plastigage.
D. Connecting rod side clearance.

A

B. Alignment of the locating tangs and oil holes.

25
Q

The device shown in figure 54 is a:

A

tapered sleeve piston ring compressor

26
Q

During installation, piston and connecting rod assemblies must be correctly positioned in relation to the cylinder block to:
A. Minimize contact with internal engine components.
B. Prevent contact with internal engine components.
C. Keep the piston rings from catching the top of the cylinder bore.
D. Minimize blowby and oil consumption.

A

B) Prevent contact with internal engine components.

27
Q

What is the correct term for the dimension being shown in figure 55?

A

Connecting rod side clearance

28
Q

List 3 methods for torquing connecting rod fasteners:
A.
B.
C.

A

A. Torque wrench- bolt or cap screw torqued to a specified valued.
B. Torque and turn- bolt or cap screw torqued to a specified value then turned and additional number of degrees.
C. Bolt stretch (elongation)- a special gauge reads the actual change in bolt length as it is tightened.

29
Q

Explain why bearing clearance is necessary.

A

Bearing clearance is necessary for expansion and lubrication of the connecting rod journal and bearing.

30
Q

What check should be performed after torquing the fasteners of each connecting rod?

A

Check the crankshaft for free rotation.