190201i Camshaft and Follower Service

Question 0

What are some things that will happen when gears are worn between camshaft and crankshaft

Answer 0

Worn gears will retard timing which may cause white smoke

Question 1

Why check for drive gear wear or chain slack before removing the camshaft

Answer 1

You don’t want to put worn out components back in

Question 2

Chains should be checked for amount of slack between gears or sprockets. as a rule of thumb what is the maximum amount of slack

Answer 2

no more than half inch between chain travel( not the outside)

Question 3

Properly identify lifters and position for two reasons. what are they?

Answer 3

For inspection and diagnosis. If they are to be reused they must be kept with the camshaft lobe that they were mated to

Question 4

The thrust plate is usually fastened to what?

Answer 4

The cylinder block

Question 5

When removing the camshaft prevent bearing damaged by…

Answer 5

Rotating the cam back-and-forth slightly and keep from allowing lobes to hit and damaged bearings

Question 6

If you wash a cam with a mechanical parts washer, steam cleaner or a pressure washer prevent rust by

Answer 6

Likely oiling machine surfaces such as lobes and journals

Question 7

Inspect cam journals, lobes and thrust surfaces for these four things

Answer 7

Scuffing, scoring, cracks and surface fatigue ( spalling / flaking )

Question 8

If I cam has fuel injector lobes why is it more prone to surface fatigue then valve lobes

Answer 8

Injector lobes are exposed to higher loads

Question 9

Discoloration of machined surfaces is a sign of what

Answer 9

Excessive heat or lack of lubrication

Question 10

Cam journals must be measured to determine what two things

Answer 10

Wear and runout. When the shaft where out, you measure for minimum outside dimension

Question 11

A cam shaft binding when rotating in the block or showing uneven camshaft bearing wear is an indication of what

Answer 11

A bent camshaft. They are normally replaced not straightened

Question 12

What measuring tool can you use to measure lobe lift in and out of an engine on a camshaft

Answer 12

A dial indicator

Question 13

What do you inspect your teeth for

Answer 13

Broken, cracked or pitted teeth

Question 14

Large areas of fretting indicate movement between cam nose and gear. What can this cause

Answer 14

This can eventually cause the camshaft nose to break off

Question 15

Why is it important to note the thrust plate direction of installation

Answer 15

There maybe lubrication grooves on one side only

Question 16

Worn cam bearings will do what three things

Answer 16

Not support can properly during operation allowing flex and bend, increased cam journal to bearing oil clearances leading to decreased oil pressure, reduced flow of lubrication to the valve operating mechanism on some engines where the oil supplied to the valve operating mechanism comes from the camshaft bearings

Question 17

When is the greatest chance of bearing damage

Answer 17

When removing the camshaft and During replacement.

Question 18

Besides manufacturer recommendations what three things should be considered when heating camshaft gear for installation

Answer 18

Heating time, temperature and lubricants to prevent gear damage

Question 19

After a cam gear has been installed what two things should be considered

Answer 19

Allow heated gear to cool slowly at room temperature do not rapid cool, keep the camshaft vertical during the cooling process to ensure the gear stays in position

Question 20

What five things may the cam gear drive regarding other engine accessories

Answer 20

Balance shafts, fuel injection pump, oil pump, water pump, and accessory drive

Question 21

What are the two types of lube that you should use to lubricate flat face lifters and roller type followers

Answer 21

Flat face should use EP extreme pressure lube roller type can be lubed with clean engine oil