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Registered
Join Date: Dec 2014
Location: Essex County NJ
Posts: 46
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Clutch slip 1975 911s
I have a 1975 911s I am sorting out after it's been sitting for a number of years. The clutch is slipping between 3k & 5k RPMs. Can this be addressed by adjusting the clutch cable underneath the car, as per the Pelican article? Or don't even bother, time for a new clutch.
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07-05-2017, 06:18 AM
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Join Date: Jan 2009
Location: Marietta, Ga (Atlanta)
Posts: 2,970
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Quote:
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'80SC Widebody 3.6 transplant Anthracite "The Rocket" Long gone but still miss them all: '77 911 Targa, '72 BMW 3.0CS Coupe(finest car I ever had!) '71 911T Coupe White, '70 911T Coupe Blue '68 911 Coupe Orange, '68 911L Soft Window Targa |
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07-05-2017, 06:31 AM
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Administrator
Join Date: Feb 2015
Posts: 3,359
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Any idea how many miles are on that clutch? Any other noticeable symptoms besides the slippage?
Does sound like it may be time for a new one. So, if it's time I'm sure our clutch article will be of use to you. Good luck! Porsche 911 Clutch Replacement | 911 (1965-89) - 930 Turbo (1975-89) | Pelican Parts DIY Maintenance Article |
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07-05-2017, 07:35 AM
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Join Date: Dec 2014
Location: Essex County NJ
Posts: 46
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no other symptoms, it takes off fine just revs quickly btwn 3&5k RPM with out additional forward momentum
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07-05-2017, 10:54 AM
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Registered
Join Date: Jan 2004
Location: Pittsford, NY
Posts: 3,701
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I would start with a full re-adjust of the cable. slacken off and start from scratch and then test drive.
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Tony G 2000 Boxster S |
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07-05-2017, 12:13 PM
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76 911S Targa
Join Date: Oct 2010
Location: Idaho
Posts: 1,150
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As I recall you should have about 25 mm (one inch) of clutch free play. Pull the clutch all the way back with your hand, then press it forward until the free play stops. How much? If you don't have any free play, you need a clutch adjustment. If you have proper free play, it is time to pull the engine and have a look to determine the cause of the slippage.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods. |
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07-05-2017, 04:32 PM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,705
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There's always a chance the clutch has been oiled by a leaking crank seal or tranny seal. If you take 'er apart to do a new clutch, check for those, or you'll risk ruining the new disk too ...
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07-05-2017, 06:47 PM
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+1 on probable oil contamination. A car that has sat for a number of years most likely has some sealing issues.
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07-05-2017, 07:03 PM
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