You are a mechanic who is measuring the valve clearance on a motorcycle engine. The current clearance for one of the valves is 0.30 millimeter (mm). The clearance should be at least 0.18 mm and no more than 0.22 mm. The valve clearance is set by using a spacer that reduces the distance between the cam and the valve by the size of the spacer. Spacers are available in 0.04 mm increments, and the spacer currently in the motorcycle engine is 2.84 mm. Which of the following size spacers, in millimeters, should you use to achieve a correct valve clearance?

On motorcycle and automobile engines, valve clearances essentially refer to the gap or distance between the top of the valve stem and the camshaft that controls it.

The exhaust valves in an automobile engine release the burned gases, while the intake valves permit air and fuel into the cylinder.

Given that:

The current clearance = 0.3 mm
The clearance range is between = 0.18 mm - 0.22 mm
The available spacer = 0.04 mm increments
The current spacer is = 2.84 mm

The difference in between the current and clearance range is:

0.3 mm - 0.18 mm = 0.12 mm
0.3 mm - 0.22 mm =0.08 mm

However, for clearance to be positioned within 0.18 mm - 0.22 mm. The required spacers to be used are 0.04 mm, and 0.08 mm in conjunction with:

Clearance 0.3 = 3.14
Clearance 0.18 = 3.02
Clearance 0.22 = 3.06

The mean value = 3.04

Therefore, for us to approach and get to the value of 3.02, the required spacers to be that must be added are:

2.84+0.04 2.88
2.84+0.08 2.92
2.84+0.12 2.96
2.84+0.16 3.00
2.84+0.2 3.04

Therefore, we can conclude that the 0.2 mm spacers will be utilized in order to achieve the correct valve clearance.

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