 '72, 914/4 clutch arm vobbling, Is it normal? |
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| larss |
 Dec 14 2012, 05:18 AM
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#1
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Member  Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia  |
When working with getting rid of vibrations from the engine (which succeded when I put back my old engine rubber mounts instead of the new 911 ones) I noticed that the clutch arm is wobbling a bit (approx 1mm in its outer end) when cranking the engine, is this normal?
Through inspection holes I can see flywheel and clutch running straight non wobbling at cranking. The car is all original tail shift 1,7. /Lars |
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| SirAndy |
Dec 14 2012, 12:12 PM
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Resident German Group: Admin Posts: 41,651 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(larss @ Dec 14 2012, 03:18 AM)  When working with getting rid of vibrations from the engine (which succeded when I put back my old engine rubber mounts instead of the new 911 ones) I noticed that the clutch arm is wobbling a bit (approx 1mm in its outer end) when cranking the engine, is this normal? There is a plastic bushing on the arm where it sits on the pivot that is bolted to the case. My guess is your bushing has disintegrated allowing the arm to wobble. (IMG:style_emoticons/default/idea.gif) |
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| larss |
Dec 14 2012, 12:58 PM
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#3
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Member Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia |
QUOTE(SirAndy @ Dec 14 2012, 07:12 PM) There is a plastic bushing on the arm where it sits on the pivot that is bolted to the case. My guess is your bushing has disintegrated allowing the arm to wobble. (IMG:style_emoticons/default/idea.gif) Thanks! Just checked the cup bushing before I put the engine/trans together yesterday, it is quiet new and was OK. Guess the wobble comes from that the clutch feather spring surface which the release bearing rest against is wobbling a bit, due to the clutch release arms length the wobbling is amplified to reach about 1mm at the arms end. No wobbling can be felt at the pedal however. Dont know how many of us have checked the (released) arm when cranking (I disconnect the ignition coil so I can crank without engine starting), any input is appriciated! /Lars S |
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| Cap'n Krusty |
Dec 14 2012, 02:14 PM
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#4
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
I think you're worrying about something that just isn't very important. It's one of those things amateurs are concerned about and professionals don't even notice.
The Cap'n |
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| McMark |
Dec 14 2012, 03:28 PM
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#5
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
What you're probably feeling is the 'slop' between the throwout bearing and the sleeve. Normal.
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