Cub-cadet Yanmar 3TNV72 User Manual download pdf (Page 125)

ENGINE

6-26 TNV IDI Service Manual

Cylinder Head

Inspection of Rocker Arm Assembly

Rocker Arm Shaft Hole Diameter

Use a telescoping gauge and micrometer to

measure the inside diameter of all the rocker arm

support brackets and the rocker arms

(Figure 6-12). Record the measurements. See

Rocker Arm and Shaft on page 6-7 for the service

limit.

Inspect contact areas (Figure 6-12, (1)) for

excessive wear or damage.

Figure 6-12

Rocker Arm Shaft Outside Diameter

Use a micrometer to measure rocker arm shaft

diameter. Measure at each rocker arm location in

two directions 90° apart (Figure 6-13). Record the

measurements. See Rocker Arm and Shaft on

page 6-7 for the service limit.

Figure 6-13

Inspection of Valve Guides

Visually inspect the valve guides for distortions,

scoring or other damage.

Note: Measure valve guides while they are

installed in cylinder head.

Use a telescoping gauge and micrometer to

measure the inside diameter of the valve guide.

Measure in three places and 90° apart

(Figure 6-14). Record the measurements. See

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

the service limit. Replace valve guides if not within

specification.

Figure 6-14

Inspection of Cylinder Head

Cylinder Head Distortion

Put the cylinder head flat and inverted (combustion

side up) on the bench. Use a straightedge and

feeler gauge to measure cylinder head distortion

(Figure 6-15). Measure diagonally and along each

side. Record the measurements. See Cylinder

Head on page 6-5 for the service limit.

Figure 6-15

0001916

(1)

0001952

0001869

0000192

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Cub-cadet Yanmar 3TNV72 User Manual Page 125

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