201kb - Cylinder Head Service Flashcards

1
Q

What are valve springs inspected for?

A
  • Nicks, cracks, corrosion, wear
  • Squareness (tilt/lean)
  • Tension
  • Length

201kb pg. 2

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2
Q

What is spring free length?

A

Uncompressed spring length

201kb pg. 3

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3
Q

What is spring squareness?

A

Measurement of the lean in a spring. Maximum allowed variation is generally 1/16”

201kb pg. 3

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4
Q

What does low valve spring tension cause?

A
  • Poor valve sealing
  • Poor valve cooling
  • Valve float at high engine speeds

201kb pg. 5

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5
Q

What is valve spring installed height?

A

Measurement from spring seat on cylinder head to underside of spring retainer.

201kb pg. 14

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6
Q

How can the valve spring installed height be modified?

A

Increased by adding shims under the spring. No more than 2 shims with maximum thickness of 0.060”

201kb pg. 14

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7
Q

A vacuum gauge can be used to check valve sealing. What amount of vacuum is used for the test and what constitutes excessive leakage?

A

Apply 20 inHg
A drop of 10 inHg in 10 seconds is excessive

201kb pg. 15

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8
Q

Should the cylinder head be pulled down onto the block with the fasteners when reinstalling?

A

No. Could damage the head or gasket.

201kb pg. 17

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9
Q

What would result from having oil in the cylinder head bolt holes when installing and torquing the cylinder head down?

A

Hydraulic lock and potentially crack the block

201kb pg. 17

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10
Q

Accuracy of torquing is subject to what 4 factors?

A
  • Thread condition
  • Condition & lubrication of mating surfaces
  • Type of lubrication used
  • Accuracy of the torque wrench

201kb pg. 18

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11
Q

Valve clearance adjustments are necessary to:

A
  • Provide clearance for heat expansion
  • Compensate for regular wear

201kb pg. 21

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12
Q

What position must the valves be in prior to valve clearance adjustments?

A

Closed, with cam followers on base circle of cam lobe

201kb pg. 22

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13
Q

Why must injectors be installed with new o-rings and seals?

A

To prevent fuel and combustion gas leaks

201kb pg. 23

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14
Q

What could result from over compressing valve springs during installation?

A

Damage to valve seals

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15
Q

As the installed height of valve springs increase, valve spring tension:

A

Decreases

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16
Q

Crossheads must be carefully adjusted to ensure that:

A

Both valves open at precisely the same time