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> can someone please explain to me, and/or console me on my loss
mrhurtalot
post May 7 2008, 09:15 PM
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(EDIT) heres a link to the post with pics.. http://www.914world.com/bbs2/index.php?sho...3727&st=25#




my teener was out of commission since about october until two weeks ago, i finally got the cv fixed and reshaped the shift rod and several other little things.

man, it was awesome, for two weeks the weather here was perfect, i had the top off, just cruising about. looking like a BAMF. (IMG:style_emoticons/default/driving-girl.gif)

but today, i pull out of my garage, drive about 3 blocks down my street, stop at the stop sign.

I start to go, when suddenly BAM!

the exact same thing happens.

the cv bolts shear off. car stops. and i go off.

so, ive probably got a bent cv joint. and a bent shift rod again.


can someone please explain. ive only got a 2.0. nothing fancy. this shouldnt be happening. unless its an undocumented feature of some sort.


(IMG:style_emoticons/default/WTF.gif)
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SirAndy
post May 7 2008, 09:21 PM
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QUOTE(mrhurtalot @ May 7 2008, 07:15 PM) *

can someone please explain. ive only got a 2.0. nothing fancy. this shouldnt be happening. unless its an undocumented feature of some sort.


do you have the two pins that are supposed to lock the CVs and stubs together?

if you only have the 4 bolts but not the two pins, you're asking for trouble ...
(IMG:style_emoticons/default/idea.gif) Andy
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mrhurtalot
post May 7 2008, 09:30 PM
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to my knowledge, yes, there are the spiral pins. i had that thought earlier, but pushing a car uphill for like 3 blocks generally makes one very tired and reluctant to slide under a car and check.

but i see no reason as to why they would suddenly be gone.
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SirAndy
post May 7 2008, 09:33 PM
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QUOTE(mrhurtalot @ May 7 2008, 07:30 PM) *

to my knowledge, yes, there are the spiral pins. i had that thought earlier, but pushing a car uphill for like 3 blocks generally makes one very tired and reluctant to slide under a car and check.

but i see no reason as to why they would suddenly be gone.


with the pins in place, they *only* way you can shear off the bolts is if all the bolts came lose. there's no other way (well, maybe if you're pushing 1000 HP) ...

did you use NEW schnorr washers for the bolts? did you use the correct torque? did you make sure the thread was clean and not gunked up before you torqued down the bolts? new gaskets?
(IMG:style_emoticons/default/idea.gif) Andy

PS: (IMG:style_emoticons/default/thisthreadisworthlesswithoutpics.gif)
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r_towle
post May 7 2008, 09:38 PM
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Gaskets...
I had simliar issues till I actually looked at the book and found a gasket in there....if you dont have it the bolts will feel tight, the the CV joint is never crushing the gasket so the bolts get loose.

Pull out the bolts, drill holes in them like Dr Evil does (or buy his) and use wire through the heads, new washers and new gaskets.
Rich
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mrhurtalot
post May 7 2008, 10:07 PM
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will get pics tomorrow.

new gasket was in place. new bolts. yes washers.

again. let me emphasize that the car has been driven for less than two weeks after all repairs were complete. i seriously doubt that the bolts just came loose.


bleeh thanks for the fast responses guys.

ive got a fun day lined up tomorrow. (IMG:style_emoticons/default/smile.gif)
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PeeGreen 914
post May 7 2008, 10:13 PM
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You still didn't say if you have the studs in there or not. (IMG:style_emoticons/default/confused24.gif)
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r_towle
post May 7 2008, 10:15 PM
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QUOTE(mrhurtalot @ May 7 2008, 11:30 PM) *

to my knowledge, yes, there are the spiral pins.

Rich
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Gint
post May 7 2008, 10:16 PM
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You did say...

QUOTE(mrhurtalot @ May 7 2008, 08:15 PM) *
the cv bolts shear off. car stops.

Did they shear off, fall off, what? Have a look at it and get some pics.

QUOTE(mrhurtalot @ May 7 2008, 09:07 PM) *
ive got a fun day lined up tomorrow. (IMG:style_emoticons/default/smile.gif)

Look at the bright side. It beats swapping out a transaxle for the second time in a week.
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SGB
post May 7 2008, 10:29 PM
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I don't have spiral pins. I have little protuding cylindrical stubs, Maybe 8mm dia by 4mm tall.

I think something is wrong there, and has been from the start.

Those pins -er, I mean stubs- stick in pretty far...
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PeeGreen 914
post May 7 2008, 10:36 PM
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QUOTE(SGB @ May 7 2008, 09:29 PM) *

I don't have spiral pins. I have little protuding cylindrical stubs, Maybe 8mm dia by 4mm tall.

I think something is wrong there, and has been from the start.

Those pins -er, I mean stubs- stick in pretty far...

(IMG:style_emoticons/default/agree.gif)
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mrhurtalot
post May 8 2008, 12:12 AM
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by spiral pins, i meant the stubs. just to clarificate that.
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McMark
post May 8 2008, 12:15 AM
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They sheared off???? (IMG:style_emoticons/default/ohmy.gif)

If the pins are in place, and the bolts sheared off (not unscrewed) then perhaps they were over-tightened to the point where they were just waiting to break.

If the bolts did unscrew then use Dr. Evil's drilled bolts. And always clean the grease out of the bolt holes and threads with Q-Tips and brake cleaner. The less grease in the threads, the less chance it will unscrew itself.
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jd74914
post May 8 2008, 12:46 AM
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I would think that the threads would strip or be pulled off before you could force a bolt to shear.

If you had the pins they must have been loose?
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akellym
post May 8 2008, 06:20 AM
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Don’t use gaskets!! They will compress over time. Just use silicon to seal it. Loctite will keep your bolts from coming loose.
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SGB
post May 8 2008, 07:05 AM
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Evil safety wired bolts are cheap insurance.
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r_towle
post May 8 2008, 07:38 AM
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QUOTE(akellym @ May 8 2008, 08:20 AM) *

Don’t use gaskets!! They will compress over time. Just use silicon to seal it. Loctite will keep your bolts from coming loose.


I respectfully disagree.
If no gasket is used the CV joint does not fit correctly

Rich
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ChrisFoley
post May 8 2008, 08:08 AM
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QUOTE(r_towle @ May 8 2008, 09:38 AM) *

QUOTE(akellym @ May 8 2008, 08:20 AM) *

Don’t use gaskets!! They will compress over time. Just use silicon to seal it. Loctite will keep your bolts from coming loose.


I respectfully disagree.
If no gasket is used the CV joint does not fit correctly

Rich

I disagree with both of you. (IMG:style_emoticons/default/happy11.gif)
The gasket does not affect the alignment/fit of the cv to the flange. What it does is prevent grease from slinging all over the place. A bead of silicone will not stay put for long. The centrifugal force will make it come off. At least on a track car thats what happens.
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Mark Henry
post May 8 2008, 08:15 AM
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The spiral pins are fine, Porsche use both spiral and solid over the years.
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ericread
post May 8 2008, 09:41 AM
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QUOTE(jd74914 @ May 7 2008, 11:46 PM) *

I would think that the threads would strip or be pulled off before you could force a bolt to shear.

If you had the pins they must have been loose?


(IMG:style_emoticons/default/agree.gif) That's some amazing torque that would cause four bolts to shear off! I can't wait to the the pictures...
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