PRE-RELEASE
Measuring piston height
| Measuring piston height |
| Choice of cylinder head gasket |
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The thickness of the cylinder head gasket depends on how far the piston protrudes above the sealing surface of the cylinder block.
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| • |
There are three gasket thicknesses available. Refer to the table in
Engine block
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Before taking measurements, the surfaces must be thoroughly cleaned from soot residue, etc.
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The height of each piston must be measured in two different places.
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Make sure each piston is at top dead centre before being measured as follows:
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| 1. |
Fit a
78 40 622 Dial indicator
in a
Measuring jig
.
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| 2. |
Place the measuring jig on the cylinder block sealing surface so that the point of the dial indicator makes contact with the block.
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| 3. |
Zero the dial indicator.
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| 4. |
Place the measuring jig over one of the piston measuring points, see illustration.
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| 5. |
Turn the crankshaft in the direction of rotation while reading the dial gauge. Note the highest value shown on the dial before the pointer starts to go back.
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| 6. |
Repeat the previous step on the other piston measuring points.
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| 7. |
Calculate the average value for each piston.
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| 8. |
Note the maximum value for each of the three pistons in each cylinder bank.
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| 9. |
Select a gasket thickness from the table, see
Engine block
depending on the obtained maximum value.
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