Cub-cadet Yanmar 3TNV72 User Manual download pdf (Page 126)

ENGINE

TNV IDI Service Manual

6-27

Cylinder Head

If distortion exceeds the service limit, resurface or

replace the cylinder head. Remove only enough

material to make the cylinder head flat, but do not

remove more than 0.008 in. (0.20 mm).

Inspection of Intake and Exhaust Valves

Visually inspect the intake and exhaust valves.

Replace any valves that are obviously discolored,

heavily pitted or otherwise damaged.

Valve Stem Diameter

Use a micrometer to measure the valve stem

diameter. Measure the valve stem near the

combustion end and near the opposite end

(Figure 6-16, (1)). Record the measurements. See

Intake / Exhaust Valve and Guide on page 6-6 for

the service limit.

Figure 6-16

Valve Stem Bend

Place the valve stem on a flat inspection block or

layout bed. Roll the valve until a gap can be

observed between a portion of the valve stem and

the surface of the block or bed. Use a feeler gauge

to measure the gap (Figure 6-17). Record the

measurements. See Intake / Exhaust Valve and

Guide on page 6-6 for the service limit.

Figure 6-17

Valve Recession

Note: The valve guides must be installed to

perform this check.

Insert the valves into their original locations and

press them down until they are fully seated. Use a

depth micrometer (Figure 6-18) to measure the

difference between the cylinder head gasket

surface and the combustion surface of each

exhaust and intake valve (Figure 6-19). Record the

measurements. See Cylinder Head on page 6-5 for

the service limit.

Figure 6-18

Figure 6-19

0000197

(1)

000019

0001755

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