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Clutch, Tranny or both?
Need some expert opinions here if possible? Today when I went
through the gears I hit third, started to accelerate and the tach reved up. It felt like third gear was slipping a bit. Is this the clutch going or time for a tranny rebuild? Any idea's?
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Huey581 86' 911 Cab |
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06-06-2004, 11:17 AM
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Location: Los Alamos, NM, USA
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Gears do not slip (they are always in mesh - except for reverse) and the synchro hub (dog teeth) and operating sleeve are either engaged together or not; again they do not slip. You likely have a clutch problem; did the engine noise also increase with the tachometer rise? Jim
Last edited by Jim Sims; 06-06-2004 at 12:00 PM.. |
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06-06-2004, 11:39 AM
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Yes, engine noise did increase!
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Huey581 86' 911 Cab |
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06-06-2004, 11:46 AM
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You might try adjusting the clutch but depending on the miles you may be simply due for a clutch job. How many miles does the clutch have on it? There is also the possibility that either the transmission input shaft oil seal or the engine rear main seal has failed allowing oil to reach the clutch friction surfaces. Any sign of oil coming from the clutch bell housing? Jim
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06-06-2004, 11:59 AM
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Thanks Jim! Car has 70K miles and no oil leak. Does have a familiar "Clutch" smell when hot though!
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Huey581 86' 911 Cab |
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06-06-2004, 01:41 PM
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Automotive Monomaniac
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I'd say clutch.
I once had my clutch flood with transmission oil when the case cracked (it was on a VW Golf) and it slipped - all the time. The car wouldn't even move under it's own power!
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2018 - Porsche 911 Carrera 7MT / 2018 - Porsche Macan 7DCT / 1993 - Cadillac Allante / 2023 - RAM TRX (on order) |
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06-06-2004, 01:46 PM
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Probably time for a "clutch job" then. Jim
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06-06-2004, 01:50 PM
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canna change law physics
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Clutch
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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06-06-2004, 01:57 PM
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"C-Rations"
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I'll second the clutch job. If the trans will not go into gear afterwards, I would proceed with a trans inspection.
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John The Stable: 1985 Carrera Cabriolet (RoW) Sold 2002 Chevy Tahoe LT (The Wife's) 1999 Chevy Silverado (Parts Hauler) 1969 Volkswagen Beetle (Purchased From Original Owner) I'm slower than the guy in front of me, but faster than the guy in back of me. |
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06-06-2004, 03:09 PM
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Clutch
Be sure to replace the cable also. Great time to clean and detail the motor.
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'75 914-6 3.2 (Track Car) '81 SC 3.6 (Beast) '993 Cab (Almost Done Restoring) |
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06-06-2004, 05:45 PM
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I just had the same thing start to happen, but I put in a new Sachs sport clutch just about 2,000 miles ago and had the flywheel resurfaced.
The strange thing is, it only happens some of the time (at WOT higher in the rev range in 2nd or 3rd). It seems to happen after an "imperfect" shift, but then usually is gone when I try to recreate it. Can a clutch alternate between holding and not holding like that, or is that just an earlier sign of failure? I have no oil leaks from the bellhousing, and I really hope I don't need a new clutch so soon! Has anyone evey had this and been able to adjust it to get it right again? Olivier
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Olivier Hecht 1982 911SC |
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06-07-2004, 06:00 AM
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1986 Porsche 911 Cab 3.2L 
1970/1982 Porsche 914-6/911SC 2.7 RS
1985 Porsche Carrera Cabriolet (RoW) 3.2L
