PRE-RELEASE
Piston height, measuring
| Piston height, measuring |
| Selecting cylinder head gasket |
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The thickness of the cylinder head gasket is determined by how much the piston pushes up over the gasket surface of the cylinder block.
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Three gasket thicknesses are available. See the table in
Data, engine block.
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Before measuring, surfaces should be thoroughly cleaned of soot particles and the like.
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Piston height should be measured at two different points on each piston.
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Before each piston measurement, make sure that the piston is in its top-most position 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 against the cylinder block's gasket surface so that the dial indicator probe is in contact with the block.
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| 3. |
Reset the dial indicator.
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| 4. |
Place the measuring jig over one of the pistons' measurement points. See illustration.
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| 5. |
Turn the crankshaft in its direction of rotation while reading the dial indicator. Read and note the highest value on the dial indicator before the point turns.
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| 6. |
Repeat the previous point for the other measurement point on the piston.
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| 7. |
Calculate the average for each piston.
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| 8. |
Note the max value for the three pistons of each cylinder bank.
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| 9. |
Select a gasket thickness from the table, see
Engine
, based on the max value obtained.
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