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totle's Avatar
 
Join Date: Oct 2008
Location: Norway / Miami
Posts: 1,297
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G50 release fork problems

Had clutch failure this wee and it turned out that the release fork boss gave up.

G50 release fork boss failure

Anyone with similar problem ?

Maybe with stage 2 PP, load is too much without reinforcing ?
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 06-22-2014, 02:34 PM
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Location: Michigan
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One of the guys over on Rennlist had that failure from a mis-positioned throw-out bearing. The ears rotated out of position during the engine-transmission mating process and he didn't see that. He got the shaft through the release arm, stepped on the clutch and broke the bosses.
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Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 06-25-2014, 04:13 AM
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Hi Paul,

In my case I suspect the extra force from the KEP stage 2 pressure plate that is the main reason.
Also the holes was mashined bigger for the newer type release fork axel. This cause the boss the get weaker as it is less aluminum to withhold
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 06-25-2014, 05:01 AM
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Location: Michigan
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Quote:
Originally Posted by totle View Post

In my case I suspect the extra force from the KEP stage 2 pressure plate that is the main reason.
Also the holes was mashined bigger for the newer type release fork axel. This cause the boss the get weaker as it is less aluminum to withhold
I bet it might have broke from a combination of the two.
Can you get it repaired in Norway or are you sending it over here?
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Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 06-25-2014, 09:48 AM
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I picked it up from the welder today.
Was not the easiest alloy to weld, but should be good now
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 06-26-2014, 08:42 AM
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