Frame, Block and Cylinders D2L

Question 1

What type of engine block has an underslung crankshaft?

Answer 1

One-Piece Block
- most common, main bearing caps UNDER the crankshaft
-block contains crank and cylinders, more rigid, used in med-high speed engines.

Question 2

True or False;
Engine blocks with a bedplate have underslung crankshafts.

Answer 2

False
-Multi-Piece blocks have overslung crankshafts, main bearing caps are on top(OVER) of crankshaft.
-Bedplates hold crankshafts, everything else bolts on. (block, cylinders etc.)

Question 3

What describes the deck height of an engine block?

Answer 3

The distance from the main bearing bore centre to the top surface where the head is bolted on

Question 4

True or False;
The highest amount of main bearing bore alignment deviation allowed, is no more than half of the maximum main bearing clearance at new condition.

Answer 4

True

Question 5

Which aspect of an engine would change if the deck height of the block was reduced?

Answer 5

Compression Ratio
-changes the volume of the cylinder, therefore changing the compression ratio

Question 6

What are the steps in order from start to finish, to describe the procedure for measuring the main bearing bore diameters.

Answer 6

-Remove bearing caps
-Remove crankshaft
-Install bearing caps
-Torque bearing caps to spec
-Use dial bore gauge to measure diameter in multiple locations
-Compare measurements to manufactures to determine out of round

Question 7

What would cause a reading to be indicated on a web deflection gauge.

Answer 7

-Soft foot on the block
-Bearing bore misalignment

Question 8

What type of cylinder construction would be most effective at transferring heat away from the cylinder bore?

Answer 8

Wet-Liner

Question 9

True or False;
Wet cylinder liners have thin walls and are reliant on the bore in the block to help them form the correct shape and diameter.

Answer 9

False

Question 10

What location in the cylinder receives the greatest amount of wear?

Answer 10

At the top of piston(ring) travel.
-also on the major thrust side when cylinder pressure and temperature are at maximum.
(power stroke)

Question 11

What type of two-stroke cylinder liner has the liquid coolant passages built into the liner itself?

Answer 11

Integral
-Integral water jacket
-not common

Question 12

What does measuring a cylinder at multiple locations indicate about the cylinder?

Answer 12

The shape and size of the cylinder.
-90° to crank centreline
-parallel to crank
-3 positions, top-middle-bottom

Question 13

What could cause flange cracks on a cylinder liner?

Answer 13

-Over-torquing head bolts
-A distorted block
-Incorrect liner protrusion

Question 14

If a liner experienced cavitation, where would evidence of the cavitation be found? and why?

Answer 14

-On the coolant side of the liner.
-Cavitation causes are due to liner vibration.

Question 15

What procedure would need to be performed to make the cylinder walls parallel?

Answer 15

Honing
-if taper and wear does not exceed 0.002”(maximum), the cylinder can be made straight with a rigid or fixed hone.

Question 16

True or False;
The counter bore in the block needs to be measured to ensure the liner flange sits flush with the top of the block, when it is installed.

Answer 16

False;
-The liner counterbore should be measured for depth and flatness, using depth mic. If incorrect it affects liner protrusion height. (liner sits slightly above).