PRE-RELEASE
Checking the crankshaft
| Checking the crankshaft |
| 1. |
Place
87 92 194 Dial gauge kit
and
87 90 727 Dial gauge mounting
onto the cylinder block with the dial gauge pin against one side of the crankshaft.
|
|
| 2. |
Move the crankshaft lengthwise and read off the play.
|
|
| 3. |
Compare this value with the permitted play, see
Crankshaft
.
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|
| 4. |
Remove the dial gauge.
|
|
| Rotational deviation |
| 1. |
Place
87 92 194 Dial gauge kit
and
87 90 727 Dial gauge mounting
onto the cylinder block with the dial gauge pin against one main journal.
|
|
| 2. |
Hold up the balancer shaft chain and turn the crankshaft at an even rate.
|
|
| 3. |
Compare this value with the permitted play, see
Crankshaft
.
|
|
| 4. |
Remove the dial gauge.
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| Ovality |
Clean the crankshaft and measure its journals with a micrometer. Measurements should be taken at several points around the circumference. Main journal ovality must not exceed 0.03mm. The crankshaft should be ground to a specified undersize, see Crankshaft , if the measurements are approaching or exceed the given wear limit.
| Big-end journals |
| 1. |
Clean the crankshaft and measure the journals with a micrometer. Measurements should be taken at several points around the circumference.
|
|
| 2. |
Calculate the average for the shaft journal.
|
|
| 3. |
Clean the connecting rod and its caps and assemble them.
Tightening torque: 35 Nm 45°(26 lbf ft + 45°) |
|
| 4. |
Measure the hole with a micrometer. Measurements should be taken at several points around the circumference.
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| 5. |
Calculate the average for the connecting rod.
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| 6. |
Deduct the average value for the shaft journal from the average value for the connecting rod and its cap. The result is an average value of the play between the connecting rod and the crankshaft.
|
|
| 7. |
Compare this value with the permitted play, see
Crankshaft
.
|
|
| Main journal |
| 1. |
Clean the crankshaft and measure the journals with a micrometer. Measurements should be taken at several points around the circumference.
|
|
| 2. |
Calculate the average for the shaft journal.
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| 3. |
Clean the cylinder block and main bearing cap and assemble them.
Tightening torque: 90 Nm + 60° (66 lbf ft + 60°) |
|
| 4. |
Measure the hole with a micrometer. Measurements should be taken at several points around the circumference.
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| 5. |
Calculate the average for the main bearing.
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| 6. |
Deduct the average value for the shaft journal from the average value for the main bearing and its cap. The result is an average value of the play between the main bearing and the crankshaft.
|
|
| 7. |
Compare this value with the permitted play, see
Crankshaft
.
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