Engine Repair Work Example 12

WorkKey Level: 5
NATEF Automotive Tasks: I.C.5, I.C.6

You are doing an engine repair that requires the removal of a piston.  Before you remove the piston, you must first measure the ring ridge.  If the ring ridge is greater than 0.1 millimeter, it must be removed before the piston is removed.  The top measurement in the unworn part of the cylinder is 88.925 mm.  The measurement in the worn part of the cylinder is 89.103 mm.

 1.  What is the difference in the measurements you made?

 2.  Should the ring ridge be removed before the piston is removed?  Explain your answer.

		- 88.825 -     - 89.103 -

 

 

 

 

Solution:

1.  Ring ridge = 89.103 mm – 88.925 mm
     Ring ridge = 0.178 mm

2.  Yes.  Since 0.178 mm > 0.1 mm, the ring ridge must be removed before the piston is removed