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Registered
Join Date: Mar 2003
Location: Charlottesville Va
Posts: 5,738
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Odd clutch problem-Subie Legacy GT
Son has a Legacy Gt with some sti engine bits. Last winter his clutch began to slip under boost-new clutch a pp not long before, so he put the car aside for a while. Just had it repaired, new clutch, pp, master and slave cyls. Car was fine for a week, and as soon as temps dipped into 30's clutch slips again under boost. Common denominator is the cold, as its fine once temps climb into 50's.
What could cause this? Could wrong vis/bad trans oil? Something with the awd mechanism?
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Greg Lepore 85 Targa 05 Ducati 749s (wrecked, stupidly) 2000 K1200rs (gone, due to above) 05 ST3s (unfinished business) |
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12-14-2020, 01:20 PM
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Registered
Join Date: Aug 2008
Location: Uranus
Posts: 306
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Incorrect slave cylinder (rod too long?) for the current application? Is it a full STi conversion? Bell housing adapter wonky?
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12-14-2020, 01:48 PM
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Feelin' Solexy
Join Date: Oct 2003
Location: WA
Posts: 3,786
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That's a head scratcher.... first things first, are you sure you have the correct pp and clutch installed? Same with other items like the fork, PP bolts, etc?
Temps seem like an odd factor as I assume that once the engine is warmed up the temps at the pp/clutch surface are going to be the same whether it is 30 degrees outside or 50 degrees outside.
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Grant In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 2011 Pursuit 315 OS, 2022 Tesla Y Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S |
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12-14-2020, 01:55 PM
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Registered
Join Date: Mar 2003
Location: Charlottesville Va
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Quote:
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Greg Lepore 85 Targa 05 Ducati 749s (wrecked, stupidly) 2000 K1200rs (gone, due to above) 05 ST3s (unfinished business) |
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12-14-2020, 04:08 PM
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Registered
Join Date: Apr 2013
Location: Nevada City, Ca
Posts: 2,208
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When I replaced the clutch on my 04 WRX a new flywheel was recommended. I was told that resurfacing the flywheel wasn’t a good idea.
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12-14-2020, 05:17 PM
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Registered
Join Date: Jul 2003
Location: Valencia Pa.
Posts: 8,839
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Is there any free play in the pedal before dis engagement ? and was the flywheel machined ?
Im good at this sort of stuff, Id sort it out in no time if it was on my lift . Tough to take guesses on the google machine though
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No left turn un stoned |
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12-14-2020, 05:25 PM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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I have a story I posted before about a knock-off Sachs 911 clutch kit that of course didn't work. I'd pull the motor, do some digging.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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12-14-2020, 06:27 PM
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Hell Belcho
Join Date: Sep 2006
Location: Oz
Posts: 9,249
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How much boost?
slave fully bled? Flywheel surfaced? Thrust bearing issue?
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Saved by the buoyancy of citrus. |
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12-14-2020, 08:30 PM
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Registered
Join Date: Mar 2003
Location: Charlottesville Va
Posts: 5,738
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Just heard from the wrench. Pin to rf axle was gone, and it had slipped out somewhat. He thinks that when trans oil got viscous it caused the issue. Clutch not actually slipping.
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Greg Lepore 85 Targa 05 Ducati 749s (wrecked, stupidly) 2000 K1200rs (gone, due to above) 05 ST3s (unfinished business) |
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12-15-2020, 06:50 AM
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Registered
Join Date: Jul 2003
Location: Valencia Pa.
Posts: 8,839
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Well, that would do it ! He forgot the pin though, they just do not fall out . Ive done lots of clutches on these. First they turn up the boost, then they smoke the clutch, then a heavy duty clutch, then they start breaking expensive stuff .
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No left turn un stoned |
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12-15-2020, 07:00 AM
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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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My Subaru Forester slave cylinder died about six months ago. Replaced everything, including the oil soaked clutch.
The clutch has never been right since. The pedal engagement is about the last 1" of travel, it shudders when it's hot...I'm so sick of problems with this car...back to the shop with it.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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12-15-2020, 07:20 AM
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