Differences
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| techtalk:ref:genmsr05 [2024/02/08 23:09] – ↷ Links adapted because of a move operation hippysmack | techtalk:ref:genmsr05 [2025/07/31 02:06] (current) – [Heads] hippysmack | ||
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| Line 430: | Line 430: | ||
| **Condition**: | **Condition**: | ||
| Head gasket leak. \\ | Head gasket leak. \\ | ||
| - | You can feel around the heads for air leaks while the engine is running. | + | You can feel around the heads for air leaks while the engine is running. You can also perform a leak down or compression test on the cylinders. Or you can use a stethoscope or rubber hose to listen for air leaks around the gaskets. \\ |
| - | You can also perform a leak down or compression test on the cylinders. | + | |
| - | Or you can use a stethoscope or rubber hose to listen for air leaks around the gaskets. \\ | + | |
| **Symptom**: | **Symptom**: | ||
| Line 440: | Line 438: | ||
| Loose head bolt. \\ | Loose head bolt. \\ | ||
| + | **Symptom**: | ||
| + | A muffed bumping noise (1991-up models). \\ | ||
| + | |||
| + | **Condition**: | ||
| + | Loose or missing head breather bolt(s). ((hogluvr of the XLFORUM https:// | ||
| + | The sound is 1:1 with engine speed (each time the pistons go down). It may sound and feel like the pistons are bumping into something but there will be no metal to metal contact noise. This can happen if a head breather bolt backs out while riding or if the bolt(s) have been removed. This will also alter engine breathing and could result in puking oil out the heads. \\ | ||
| + | |||
| + | |Video: Bumping noise on 1991 Sportster \\ from missing head breather bolts ((hogluvr of the XLFORUM https:// | ||
| + | |{{ : | ||
| ===== Pistons ===== | ===== Pistons ===== | ||
| **Symptoms**: | **Symptoms**: | ||
