Engine Repair Work Example 3

WorkKey Level: 4
NATEF Automotive Tasks: I.B.3, I.B.8

You measured free height of a set of valve springs and have come up with the following:

Spring	Height (inches)	Acceptable	Not Acceptable
1	1 7/8
2	1 15/16
3	1 3/4
4	1 7/8
5	1 13/16
6	1 29/32
7	1 31/32
8	1 15/16

The manufacturer’s spec for free height is 1 7/8 inches ± 1/16 inch.  Check each spring in the table above and determine whether each is acceptable or not.

Solution:

The range of acceptable springs is as follows:
1 7/8" + 1/16" = 1 14/16" + 1/16" = 1 15/16"
1 7/8" – 1/16" = 1 14/16" – 1/16" = 1 13/16"
(1 13/16" < spring height < 1 15/16")

Spring	Height (inches)	Acceptable	Not Acceptable
1	1 7/8	X
2	1 15/16	X
3	1 3/4		X
4	1 7/8	X
5	1 13/16	X
6	1 29/32	X
7	1 31/32		X
8	1 15/16	X