Piston protrusion, measurement
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Piston protrusion, measurement
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Selection of cylinder head gasket
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The thickness of the cylinder head gasket is determined by how far the pistons protrude above the sealing surface of the cylinder block.
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Three thicknesses are available. See the table under
Engine block.
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Before measurement, clean the surfaces carefully to remove all carbon deposits and the like.
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Measure height of each piston at two different points.
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Before measurement, make sure the piston is at top dead centre as follows:
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2.
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Position the measuring jig on the cylinder block gasket surface so that the tip of the dial indicator is in contact with the block.
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3.
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Zero the dial indicator.
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4.
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Position the measuring jig above one of the piston's measuring points, see illustration.
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5.
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Turn the crankshaft in the direction of rotation of the engine while checking the dial indicator. Read off and note the maximum value shown on the dial indicator.
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6.
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Repeat the previous step for the second measurement point on piston.
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7.
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Calculate the average value for each piston.
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8.
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Make a note of the maximum value of the three pistons in each cylinder bank.
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9.
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Based on the maximum value, select a suitable gasket from the table, refer to
Engine block
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