Pressure plate wear., Causes. |
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Pressure plate wear., Causes. |
914Toy |
Mar 19 2020, 08:21 AM
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#21
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Senior Member Group: Members Posts: 727 Joined: 12-November 17 From: Laguna beach Member No.: 21,596 Region Association: Southern California |
To the brain trust: re slight shudder when engaging the clutch in first gear to begin moving forward.
The clutch assembly is a Sachs brand 228 mm and was installed new about two years ago onto a new flywheel on my 2.7 911 engine, and now has some 5,000 street miles on it. Also new was the throw out bearing (Sachs) and nylon bush under the clutch fork. I expected to see some clutch disk "burn" deposit on the fly wheel and/or pressure plate. To my surprise, while there were some small deposits on the flywheel and pressure plate, these parts and the clutch disk appear to be in near new condition - little measurable or obvious wear. However, the tips of the pressure plate "fingers (see pic) were worn down where the throw out bearing (TOB) contacts them. This suggests the TOB is slipping on the finger tips causing friction and wear. The TOB feels solid and spins freely like new. I don't believe this is normal wear. Any thoughts/advice? |
Spoke |
Mar 21 2020, 09:55 AM
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#22
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
What does the wear on the TO bearing look like? If the PP was wearing then the TO should show a similar profile.
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rgalla9146 |
Mar 21 2020, 01:54 PM
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#23
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Advanced Member Group: Members Posts: 4,624 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None |
What does the wear on the TO bearing look like? If the PP was wearing then the TO should show a similar profile. Usually it's not so much what it looks like but what it sounds like. The typical failure of a TOB is noise that changes with pressure on/off the pedal. This is caused by dried out lubrication wihin the bearing. Less common but possible is the TOB sticking or resisting free motion in the fork. Another issue is the TOB sticking on the guide tube......last but not least is a worn out pilot bearing. |
914Toy |
Mar 21 2020, 02:36 PM
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#24
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Senior Member Group: Members Posts: 727 Joined: 12-November 17 From: Laguna beach Member No.: 21,596 Region Association: Southern California |
What does the wear on the TO bearing look like? If the PP was wearing then the TO should show a similar profile. Usually it's not so much what it looks like but what it sounds like. The typical failure of a TOB is noise that changes with pressure on/off the pedal. This is caused by dried out lubrication wihin the bearing. Less common but possible is the TOB sticking or resisting free motion in the fork. Another issue is the TOB sticking on the guide tube......last but not least is a worn out pilot bearing. The throw out bearing (TOB) looks perfected at first glance, and has a smooth no slop action and turns easily. There is some slight wear evidenced by a bur around the outside of the contact ring, and in certain light shining back to ones eye there are some very shallow "indenture scallops" on the contact ring surface. There were no typical TOB sounds before removing this TOB and no vibration or sound when spinning it in my hand. It is not dry, but possibly the grease was beginning to dry. The fork is in good shape and the plastic positioning shims/spacers are in good shape, and the plastic ball cup was new and looks perfect. The TOB tube looks OK as does the needle pilot bearing which still has grease. Bottom line, the TOB appears close to good condition as does the guide tube, clutch fork, and spacers, and ball white plastic cup. But I will be installing a new TOB, along with a new pressure plate assembly. |
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