Engine Repair (A1)Question 16 of 120
Before final assembly, plastigage is used to measure:
a.Valve spring free length
b.Bearing oil clearance
c.Cylinder bore taper
d.Piston ring end gap
Explanation
Plastigage is a crushable plastic thread that indicates bearing oil clearance when compared to a scale after the cap is torqued. Ring end gap is measured with a feeler gauge in the bore, and bore taper with a bore gauge. Correct clearance is essential for oil film and bearing life.
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