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Registered User
Join Date: May 2002
Location: Portland, Oregon
Posts: 10,313
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CV Bolts!
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1973.5 911T Targa - "Smokey" 2003 BMW Z4 3.0i 2009 MB C300 |
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Registered User
Join Date: Dec 2017
Posts: 583
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Pack it up with lots of grease
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Amateur
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I would clean the crud off first.
Read this tome Reconstructing Constant Velocity (CV) Joints (recent discussion Better 8mm CV bolt?)
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I don't need that. |
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Registered User
Join Date: May 2002
Location: Portland, Oregon
Posts: 10,313
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Quote:
FWIW, my boots and CV joints appear to be fine.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1973.5 911T Targa - "Smokey" 2003 BMW Z4 3.0i 2009 MB C300 |
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Amateur
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I would clean the crud off and inspect all the bolts.
Also, I don't think flattening the moon plate is advisable since ,if I understand the thread correctly, its function is to spread out the load evenly which means it needs to be flat and flush with the CV housing.
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I don't need that. |
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Registered User
Join Date: May 2002
Location: Portland, Oregon
Posts: 10,313
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Quote:
The moon washer is very soft. It took little effort to flatten so I doubt is spreads the load between the two bolts but instead provides a non rotating surface for the schnoor washers to bite into and counteracts any rotational motion of the bolt (when it is torqued properly). It is my intent to replace the gasket, washers and bolts with new. When I was 120 miles from home and laying in a driveway on a Sunday morning, this was not an option. I did what was needed to get me through the event and back home. Following the field repair, I drove the car in anger for several miles and rechecked everything to verify it would not fall apart. After another 120 miles, I checked again a found everything intact. My question is whether I need to remove the entire axle to replace the questionable parts or can I merely pull the 4 bolts, separate the joint from the transmission and install the new parts.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1973.5 911T Targa - "Smokey" 2003 BMW Z4 3.0i 2009 MB C300 |
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Amateur
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Quote:
2.html#post1923348) I think we are both right. Quote:
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I don't need that. |
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Coram Deo
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The short answer is that you do not have to open up the other end of the driveshaft.
However, an upgrade to the Nordlock washers would prevent this from happening again. To do that, of course, you'd remove and replace all the CV bolts as they're generally considered single use.
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Dru 1980 911SC Targa • Petrol Blue Metallic • Cork special leather • Sport Seats • Limited Slip • 964 Cams • SSIs • Rennshifter 1990 Mercedes 250D Opawagen • 2002 E270 T CDI Familienwagen |
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Registered User
Join Date: Oct 2006
Location: MYR S.C.
Posts: 12,761
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make sure the bolts are long enough so that 2-3 threads stick out past the flange on the tranny side.
you can get new bolts in 5mm lengths at Fastenal. you have to buy a bag or 50 but its still cheaper than buying a full set from here. they also sell the washers.
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86 930 42kmiles [_ ![]() 88 BMW 325is 200K+ SOLD 05 BMW 330CI 130K:: [_ ![]() 08 VOLVO V70 190K:: [_ ![]() 90 B2200[__] RUNNING:[ ![]() ![]() |
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Uncertifiable!!!
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Quote:
Johan
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Living well is life's best revenge- George Herbert (1593-1633) 2006 C2S, A4 Quattro, the RST hot rod-http://forums.pelicanparts.com/porsche-911-technical-forum/748639-evolution-carrera-rst.html |
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Registered User
Join Date: Jun 2009
Location: New England
Posts: 850
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For bolts, nordlock and schoor washers, no better supplier than Belmetric. Matt and his staff are very knowledgeable!.
Those bolts are hardened, I don't think they're 'single use.'
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Robert ----------------------------------------- "A man must consider what a rich realm he abdicates when he becomes a conformist." ~ Ralph Waldo Emerson ~ (thanks to Pat Keefe) |
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Amateur
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Agreed given they are not stretch bolts as far as I know. But the heads do get buggered up so I reused them as exhaust system bolts, the length being just about right !
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I don't need that. |
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Cars and Cappuccino
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I believe the bolts are M8x50mm, 1.25mm thread, (partially threaded) "socket head" bolts. McMaster Carr has them in multiple flavors.
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http://www.carsandcappuccino.com 1987 Cherryrot G50 Coupe 1985 Prussian Blau M491 Targa - 1 of 65 in the US 1977 Mexico Blue flared, 3.2, back date, sunroof-delete Coupe - in process. 1972 Black T coupe to Longhood Turbo R5 tribute car (someday) Last edited by tdw28210; 08-12-2019 at 09:28 AM.. |
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Registered User
Join Date: May 2002
Location: Portland, Oregon
Posts: 10,313
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Met with my mechanic this morning. Not a hard job and I decided to let him do it for me as the labor cost is minimal.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1973.5 911T Targa - "Smokey" 2003 BMW Z4 3.0i 2009 MB C300 |
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Even a Bad day is good
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on 75
the bolts are 48 mm if they stick out too far they will hit the banana arm.
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1975 911S Targa Silver Anniversary Edition |
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abides.
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Replacement boot flanges can vary in thickness, so it is not really helpful to suggest what bolt lengths to purchase. If you also factor in the moon plates and different types of washers, your bolt length could be off by close to 10mm.
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Graham 1984 Carrera Targa |
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Just a word to the wise: After reading this thread, I went out and checked my flange bolts, and HALF were either somewhat loose or not up to spec (60 lb/ft for the 10mm version)! FWIW, I dropped my engine this past winter, and therefore torqued them all to spec upon re-install (April). My car is an '87, so has the moon plates. I will be adding Schnorr washers when I can source them. Lesson learned: check your flange bolts often!
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'87 Carrera (3.4L) '07 Boxter |
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Registered User
Join Date: Aug 2018
Location: San Diego, CA
Posts: 476
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Quote:
I just finished rebuilding two original CV joints and replaced two with new Lobros from Pelican. I knew I was going to use Nordlocks, (with no moon plate) which are about 2mm thick. I measured the entire stack of parts and wound up using 55mm M8 bolts. If I had blindly used the 50mm suggested length I would have been significantly too short. I used the outer stub axle to measure overall length as the transmission side looks to have more room for longer bolts. ![]() ![]() ![]() ![]()
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1978 SC Targa |
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Registered User
Join Date: Oct 2006
Location: MYR S.C.
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not sure why 2 washers.
make sure the bolts are 12.9 those look a little on the short side. make sure there are 2-3 threads sticking out past the flange.
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86 930 42kmiles [_ ![]() 88 BMW 325is 200K+ SOLD 05 BMW 330CI 130K:: [_ ![]() 08 VOLVO V70 190K:: [_ ![]() 90 B2200[__] RUNNING:[ ![]() ![]() |
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Caveman Hammer Mechanic
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Quote:
You got lucky, very lucky, that axle shaft whipping about unattached can cause thousands in damage to anything within its reach, or an accident. Reread/study/memorize the Reconstructing thread like your cars well being depends on it, it does. Everything discussed above is covered in depth, that thread could be a manual. I learned the hard way as well.
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1984 Carrera El Chupacabra 1974 Toyota FJ40 Turbo Diesel "Easy, easy, this car is just the right amount of chitty" "America is all about speed. Hot,nasty, bad ass speed." Eleanor Roosevelt, 1936 Last edited by ClickClickBoom; 08-13-2019 at 10:20 AM.. |
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