930 CV axle joint

[mark houghton]

Inspecting things with the car jacked up in prep for valve adjustments and noticed the right side axle outer CV joint boot is torn. Been noticing a weird rotational sound from that side and hoping...praying to God...that it's CV related and not a wheel bearing.
Our host has a couple options. OEM Porsche kit for around $350, or an after market kit currently going for under $100. But...but one customer review stated that it's 32mm, not 40mm...but that may be a bogus complaint. Pelican lists it as compatible with my '87 930, which is disconcerting if not true.
What say you that have BTDT?
https://www.pelicanparts.com/More_Info/91133292301.htm?pn=911-332-923-01-M60&bc=c&SVSVSI=0593

[JacobS911]

Sucks to hear that! Before ordering anything I'd take that cv out and inspect it.. along with spinning that tire after removed to see if you can tell if the bearing is in the clear. get a oem boots/clamps and liquimolly bearing grease if the cv guts look good and save yourself a ton of money.

[mark houghton]

Originally Posted by JacobS911

Sucks to hear that! Before ordering anything I'd take that cv out and inspect it.. along with spinning that tire after removed to see if you can tell if the bearing is in the clear. get a oem boots/clamps and liquimolly bearing grease if the cv guts look good and save yourself a ton of money.

Yep, first things first...deep inspection and diagnostics before spending big bucks.

[Alan L]

The boot has to come off anyway, so why not pull it and measure both ends. I would suggest washing the CVJ in petrol or similar - to get rid of all the old grease - it probably has grit in it.
Also check the wheel for bearing play while you still have it attached. If it is a bearing noise it should be obvious. I did one side about 18 mths ago. Was a process to be sure and had to make a few tools along the way. Did a post on it. Not the sort of job you really want to have to do.
If Pelican state the boot listed will fit your car and turns out it won't, they will take it back, I am sure. Generally I have found them pretty good at sorting which parts fit what.
Alan

[aschen]

I am trying these heavy duty CV boots based on some research I did here. I have the axel rebuilt but not on the car yet. The fit was a bit looser than I would like before clamping. Many more pleats and freedom to move than OE style however.

NOT an endorsement at all as I havent tested them or anything, but a data point. The OE style boots tear at a crazy rate, I think there is just so much droop travel in the suspension

https://www.amazon.com/Empi-Off-Road-Boot-Dune-Buggy/dp/B00FB7XIFG/ref=cm_cr_arp_d_product_top?ie=UTF8

[mark houghton]

Originally Posted by aschen

I am trying these heavy duty CV boots based on some research I did here. I have the axel rebuilt but not on the car yet. The fit was a bit looser than I would like before clamping. Many more pleats and freedom to move than OE style however.

NOT an endorsement at all as I havent tested them or anything, but a data point. The OE style boots tear at a crazy rate, I think there is just so much droop travel in the suspension

https://www.amazon.com/Empi-Off-Road-Boot-Dune-Buggy/dp/B00FB7XIFG/ref=cm_cr_arp_d_product_top?ie=UTF8

Worth thinking about

[Alan L]

I don't recall having any issues with the CV boots on either of my cars. Could be wrong, memory not what it was.
But I wouldn't think you should need anything too special - other than maybe avoiding cheap chinese. The problem these days is figuring what is which.
Alan

[jkkarrow]

sucks to hear.

[66cal912]

There was a rear suspension refresh thread a month or so back I commented on. I would recommend this boot in the link below. Had it on my 930 the last 15 years with zero problems. The one you purchased I also purchase and it ran big so I didn't use it. Hence why I went with the below one, it doesn't look stock, but who cares when it holds up. The OEM ones are junk IMO, to small and the bellows don't have enough articulation to live long term. I still have a whole set in a box new I decided not to use.

I went with a larger motorsports style boot for offroad racing 930 CV's that allows more articulation in the bellows and glued the boot and clamped it to the CV with the crimp bands to prevent it from slipping off. The glue was recommended by some old desert racers and I've never had a grease leak yet in the 15 years. The glue was a tan colored rubber to metal weather strip adhesive, if still available pretty sure a 3M product, here is a black version: https://www.grainger.com/product/3M-Construction-Adhesive-5-fl-2KVC4
You can get the 930 larger style boots here: https://www.mckenzies.com/collections/drivetrain/products/930-934-cv-boot-straight-flange-mount-empi-86-9301

[Alan L]

I have had issues with CV boots slipping off before. Not on the 911s (don't recall changing any).
But when fitting the boots you have to be scrupulous about removing any CV grease off the mounting points (and the inside lip of the boot). Not easy to do when the boot is full of grease. But paying attention to that makes a difference.
Alan

[Noah930]

Mark, the Pelican part number (911-332-923-01) you have listed is the same one I bought back in 2009 to replace my CV joints. Unless they've changed something in the interim, everything bolted right up. I also purchased 24 of the CV bolts (900-067-123-01).

Other recs: wear clothes you were planning on throwing away anyway, and have lots of gloves and paper towels on hand.

[mark houghton]

Originally Posted by Noah930

Mark, the Pelican part number (911-332-923-01) you have listed is the same one I bought back in 2009 to replace my CV joints. Unless they've changed something in the interim, everything bolted right up. I also purchased 24 of the CV bolts (900-067-123-01).

Other recs: wear clothes you were planning on throwing away anyway, and have lots of gloves and paper towels on hand.

Thanks for the input. I haven't removed it yet, will see what condition it is in later. Gotta finish the valve adjustment first, a royal PITA.

[svcetiquette]

For boots I'm thrilled with the Bates ones. Markedly better quality all around than the empi ones that tore after less than a few years.
https://www.racereadyproducts.com/cv-boots--flanges/bates-930-cv-boots/

[Noah930]

Oh, longevity: I replaced my CV joints and boots about 40K miles ago. Recently I started to hear an intermittent click or squeak that I think is coming from one of the right rear CVs. The boots look fine. But maybe one of the CV joints is nearing the end of its life. My shop, TRE, tells me there's a better and cheaper (!) replacement CV joint they've been using, but I haven't asked them the manufacturer.

[matsuzaka]

These hockey puck style cv joints dont have to work at severe angles like an outer cv joint in a fwd car so they are not that hard on their boots. I tend to think road debris is what cuts cv boots.
I have had to replace few boots over the last 20 years owning half dozen 911s but have not had to replace any joints. Clean the joint and check for play.

[mark houghton]

Originally Posted by matsuzaka

Clean the joint and check for play.

That's the plan. I'm hoping I have a dry joint to explain the noise I'm hearing. The alternate would not be a pretty picture.