My Tranny Rattle Explanation
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Stellar HDF Member
Joined: Jul 2010
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From: Highlands, NJ
My Tranny Rattle Explanation
Found a very interesting article on the net explaining the noise my RKC is making when hot.
It's not specifically for Harleys or motorcycles, but for manual driven vehicles in general.
"Neutral Rollover Rattle has the same characteristics as gear rattle except that rollover occurs with the engine idling, transmission in NEUTRAL, and the clutch engaged (clutch pedal released).
The rollover noise intensity increases with transmission operating temperature and engine torque load resulting from air conditioning and generator.
Neutral rollover noise is not detrimental to the engine or transmission.
In vehicles where the engine idle speed is below specification or rough, a harsh clattering noise like loose marbles in the transmission may be heard.
Rollover Noise caused by engine torsional vibrations and Clutch Release Bearing Noise are sometimes mistaken for Transmission Bearing Noise. Neutral rollover noise will disappear when the transmission is engaged in gear.
Due to a constant running clutch release bearing (used for the hydraulic clutch release mechanism), noise caused by a worn or damaged clutch release bearing will be noticeable with the clutch engaged or disengaged (clutch pedal released or depressed).
Transmission service will not eliminate gear rollover noise or clutch release bearing noise."
Kinda makes me feel better. Maybe I just need an idle adjustment.
Back to the dealer anyway.
It's not specifically for Harleys or motorcycles, but for manual driven vehicles in general.
"Neutral Rollover Rattle has the same characteristics as gear rattle except that rollover occurs with the engine idling, transmission in NEUTRAL, and the clutch engaged (clutch pedal released).
The rollover noise intensity increases with transmission operating temperature and engine torque load resulting from air conditioning and generator.
Neutral rollover noise is not detrimental to the engine or transmission.
In vehicles where the engine idle speed is below specification or rough, a harsh clattering noise like loose marbles in the transmission may be heard.
Rollover Noise caused by engine torsional vibrations and Clutch Release Bearing Noise are sometimes mistaken for Transmission Bearing Noise. Neutral rollover noise will disappear when the transmission is engaged in gear.
Due to a constant running clutch release bearing (used for the hydraulic clutch release mechanism), noise caused by a worn or damaged clutch release bearing will be noticeable with the clutch engaged or disengaged (clutch pedal released or depressed).
Transmission service will not eliminate gear rollover noise or clutch release bearing noise."
Kinda makes me feel better. Maybe I just need an idle adjustment.
Back to the dealer anyway.
Last edited by FDHOG; Oct 15, 2010 at 03:20 PM.
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