INSPECTION / REPAIR
B-52prose procedureValve stem protruding length
- 9Measure the protruding length (dimension L) of the valve stem. (1) If L is 43.5—44.0mm (1.713—1.732 in), no correction needed. (2) If L is 44.1—45.0mm (1.736—1.772 in), adjust with washer on spring seat area of cylinder head. (3) If L is 45.1mm (1.776 in) or more, replace cylinder head.
05U0BX-135
| Specification | Value |
|---|---|
| Dimension L (standard)Valve stem protruding length | 43.5mm (1.713 in) |
| Dimension L — no correctionRange 1 | 43.5—44.0mm (1.713—1.732 in) |
| Dimension L — washer adjustRange 2 | 44.1—45.0mm (1.736—1.772 in) |
| Dimension L — replace headRange 3 | 45.1 or moremm (1.776 in or more) |
Dimension L (standard)Valve stem protruding length
43.5mm (1.713 in)
Dimension L — no correctionRange 1
43.5—44.0mm (1.713—1.732 in)
Dimension L — washer adjustRange 2
44.1—45.0mm (1.736—1.772 in)
Dimension L — replace headRange 3
45.1 or moremm (1.776 in or more)
Valve spring
- 1Inspect each valve spring for cracks or damage.
- 2Measure the free length and out-of-square. Replace the valve spring if necessary.
05U0BX-136
| Specification | Value |
|---|---|
| Free length — Standard INIntake spring | 48.0mm (1.890 in) |
| Free length — Standard EXExhaust spring | 48.3mm (1.902 in) |
| Free length — Minimum INIntake spring | 47.0mm (1.850 in) |
| Free length — Minimum EXExhaust spring | 47.3mm (1.862 in) |
| Out-of-square INIntake spring | 1.68mm (0.0661 in) max |
| Out-of-square EXExhaust spring | 1.69mm (0.0665 in) max |
Free length — Standard INIntake spring
48.0mm (1.890 in)
Free length — Standard EXExhaust spring
48.3mm (1.902 in)
Free length — Minimum INIntake spring
47.0mm (1.850 in)
Free length — Minimum EXExhaust spring
47.3mm (1.862 in)
Out-of-square INIntake spring
1.68mm (0.0661 in) max
Out-of-square EXExhaust spring
1.69mm (0.0665 in) max
Camshaft
- 1Set the front and rear journals on V-blocks.
05U0BX-138 - 2Measure the camshaft runout. Replace the camshaft if necessary.
- 3Inspect the camshaft for wear or damage. Replace the camshaft if necessary.
- 4Measure the cam lobe heights at the two points as shown.
05U0BX-139
| Specification | Value |
|---|---|
| Camshaft runoutCamshaft | 0.03mm (0.0012 in) max |
| Cam lobe height — Standard INIntake | 40.888mm (1.6098 in) |
| Cam lobe height — Standard EXExhaust | 40.889mm (1.6098 in) |
| Cam lobe height — Minimum INIntake | 40.688mm (1.6019 in) |
| Cam lobe height — Minimum EXExhaust | 40.689mm (1.6019 in) |
Camshaft runoutCamshaft
0.03mm (0.0012 in) max
Cam lobe height — Standard INIntake
40.888mm (1.6098 in)
Cam lobe height — Standard EXExhaust
40.889mm (1.6098 in)
Cam lobe height — Minimum INIntake
40.688mm (1.6019 in)
Cam lobe height — Minimum EXExhaust
40.689mm (1.6019 in)