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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Broken G50 case
Popped the engine/tranny out of a friend's car today expecting to replace the clutch ... and found this ... so ... looking for a g50 for an '88 Carrera ....
Anyone seen a failure like this is a G50? Preventable? Jim Bauman 
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06-24-2005, 06:18 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,340
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Yep, that's the third one of those that I've heard of. The other two instances only had one broken ear, the one on the left in the pic above. I had that same problem (one broken ear). We think that the old G50 update that requires boring that ear out may have contributed, but not been the main culprit. A wrench on the Rennlist had the same thing happen. He believes that a combination of having the old style update done as well as having the clutch pedal out of adjustment is what causes this issue. The reasoning is that if the clutch pedal isn't adjusted correctly that it is allowed to go down too far and with the assistance of the hydraulics mucho pressure can be put on those ears.
My mechanic tried to weld and rebore mine. Didn't work. The other fella had his welded and bored and it worked great. I think I payed about 1200 for a tranny from www.oklahomaforeign.com.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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06-24-2005, 06:41 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,492
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i have a friend who does a nice job welding them. repairable if you go to the right person.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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06-24-2005, 07:39 PM
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Registered
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I broke the inside ear (left ear in your pix) when I pulled my tranny (87 G50). A local shop welded it up for me and reamed the holes to accept the updated shaft.
I have over 10K on the car since and haven't had any problems.
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Don 24 Cayman GTS - GT Silver 23 Cayman GTS - Arctic Grey - Sold 97 993 Coupe - Arctic/Black - Sold 13 991 Coupe - Platinum/Black - Sold, 87 911 Coupe - Venetian Blue |
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06-24-2005, 07:46 PM
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Registered
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Here's my handy work.
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Don 24 Cayman GTS - GT Silver 23 Cayman GTS - Arctic Grey - Sold 97 993 Coupe - Arctic/Black - Sold 13 991 Coupe - Platinum/Black - Sold, 87 911 Coupe - Venetian Blue |
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06-24-2005, 07:48 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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This one broke while driving, and the earlobes are nowhere to be found... I guess that rules out welding? Can a good welder reproduce the ears to a reasonable degree, then drill them out?
JB |
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06-24-2005, 07:49 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,340
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Yes, of my case and the other case that I had heard of prior the ears were gone and the welder had to recreate them.
Mine popped when I put the clutch in at a toll both. Kind of sucked, had to finish the last half of the 35 mile drive to where I was going and then drive back home again. Got really good at clutchless shifting up and down from 1st to 5th.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa SOLD 2004 - gone but not forgotten
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06-24-2005, 07:59 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Just a quick update: the fork is an upgraded fork, but the pivot shaft, needle bearings, etc. are all original. I thought with the fork upgrade, the pivot shaft and bearings were also upgraded, and the holes in the case bored out to a slightly larger diameter (which would weaken that area even further...).
We're taking the transmission to JWE Monday to see what they can do... !!UPDATE!! Jerry said not to bother trying to weld this case.... so, looking for a replacement case or G50 core... JB Last edited by jimbauman; 06-27-2005 at 03:54 PM.. |
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06-26-2005, 08:25 AM
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1987 Porsche 911 3.2
2013 991 Carrera
