201i - Camshaft & Follower Service

Question 1

How and why should lifters be stored once removed from engine?

Answer 1

In order and labeled for inspection and diagnosis purposes and to return them to their original location if reused.

Question 2

What should be done after washing a camshaft to protect it?

Answer 2

Lightly coat it with oil or WD40 to prevent rust

Question 3

What 5 things are camshafts visually inspected for?

Answer 3

• Scuffing
• Scoring
• Cracks
• Surface fatigue
• Discolouration

201i pg. 10

Question 4

What methods could be used to check a camshaft for cracks?

Answer 4

• Dye check
• Magnetic particle
• Magnaflux (fluorescent magnetic particle)

201i pg. 11

Question 5

How should camshaft journals be measured?

Answer 5

At A & B on both sides to determine:

• minimum outside diameter
• Wear
• Out of round
• taper

201i pg.12

Question 6

With a camshaft out of the engine on wood blocks, what would you measure with a dial indicator on the journals as you rotate the camshaft?

Answer 6

Runout

201i pg.12

Question 7

Binding or uneven camshaft bearing wear would indicate what regarding the camshaft?

Answer 7

A bent camshaft

201i pg.13

Question 8

With the camshaft in the engine, what would you be measuring if you had a dial indicator on a lobe and rotated the lobe?

Answer 8

Camshaft lobe lift

201i. Pg.15

Question 9

If you found one lifter to be worn beyond spec, what other components would you also replace?

Answer 9

All other lifters and camshaft

Question 10

What worn component would allow a camshaft to flex during operation?

Answer 10

Worn camshaft bearings

201i. Pg.21

Question 11

Worn camshaft bearings will cause what 3 things:

Answer 11

• Not support camshaft - will flex
• Increase journal to bearing oil clearance - decrease oil pressure
• Reduce oil flow to valve operating mechanism (on engines where it is supplied through cam bearings)

201i. Pg.21

Question 12

What should a camshaft thrust bearing be inspected for?

Answer 12

Minimum thickness

Also: wear, scoring, cracks

201i pg.21

Question 13

What should be used to ensure camshaft bearing oil holes are properly aligned?

Answer 13

Oil hole aligning tool

201i pg.26

Question 14

What should be measured on the camshaft drive gears before disassembly?

Answer 14

Backlash

201i pg.4

Question 15

Runout is measured to determine camshaft:

Answer 15

Straightness

201i pg.12

Question 16

When measuring a cam lobe, you obtain the following dimensions:

Base circle 1.762”, Lobe Height 2.125”.

Determine lobe lift

Answer 16

Lobe height - base circle = lobe lift
2.125 - 1.762 = 0.363”

Question 17

A roller lifter should be checked for: (3)

Answer 17

• Roller surface condition - wear, scoring
• Smooth roller operation - loose, rough, binding
• Play in bearing or pin

201i pg.18

Question 18

What 2 precautions should be observed when pressing off a camshaft gear?

Answer 18

• Support the gear in the press
• Place a wood block on the floor to protect end of camshaft

201i

Question 19

The camshaft drive gear should be checked for: (3)

Answer 19

• pitting
• cracks
• broken teeth

Question 20

What 3 factors could cause insufficient camshaft end play?

Answer 20

• Thrust plate installed backwards
• Thrust plate misaligned
• Foreign material between thrust plate and cam or gear

201i pg.31

Question 21

Fuel injector lobes are usually measured on what part of the lobe?

Answer 21

Opening ramp or rise side

201i pg.15