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Question 1

What four things should you inspect valve springs and valve spring seats for

Answer 1

Nicks, cracks, signs of corrosion and wear

Question 2

What is the free length of the valve spring

Answer 2

Free length is the freestanding or uncompressed length of the valve spring

Question 3

Valve springs should be checked for out of square what is the maximum allowable variation and why is this important

Answer 3

Generally one 16th of an inch because out of square springs will put a side load on the valve stem as it opens and closes

Question 4

When using a valve spring tester what two things are you checking

Answer 4

Specifications for open and closed valve positions at a certain height and load

Question 5

What does low valve spring tension cause

Answer 5

Poor valve sealing, poor valve cooling and valve float or flutter at high engine speeds

Question 6

When inspecting rocker arms be sure to inspect valve stem tip contact points for wear and pitting, inspect rocker arm bushings or or for wear or damage and

Answer 6

Inspect rocker arms for cracks inspect the adjusting screw, locknut and rocker arm threads for wear or damage as this will make it impossible or difficult for valve adjustment

Question 7

Crosshead rockers located by a guide pin require two additional checks what are they

Answer 7

Measure the crosshead guide pin bore and inside diameter, measure guide pin outside diameter

Question 8

Why is it important to replace excessively worn crosshead guide pins

Answer 8

They make crosshead adjustment difficult and contribute to valvetrain noise

Question 9

What are some signs of wear on pushrods

Answer 9

Signs of overheating, going, signs of fatigue, Preston welds checked for those inserts and cracks,