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914World.com _ 914World Garage _ Loose bearing race in the 915 trans....any fixes?

Posted by: ! Feb 4 2006, 06:16 PM

The bottom race in the differential housing is loose....not a good thing. Has anyone come up with a succesfull fix short of replacing the differential housing?

For those unaware as to WHY this is an issue, it spins, it makes a bigger path, it allows slop in the shaft and things get cocked and things then explode.....

Typical weak spot in the 915, especially when a 3.6 is driving it.

user posted image

Posted by: Headrage Feb 4 2006, 06:17 PM

QUOTE ("*" @ Feb 4 2006, 04:16 PM)
The bottom race in the differential housing is loose....not a good thing. Has anyone come up with a succesfull fix short of replacing the differential housing?

For those unaware as to WHY this is an issue, it spins, it makes a bigger path, it allows slop in the shaft and things get cocked and things then explode.....

Typical weak spot in the 915, especially when a 3.6 is driving it.

user posted image

Is this the tranny outta the 911?

Posted by: brp914 Feb 4 2006, 06:23 PM

cases are big $$$ - check out wevo, they'll install a new retainer. around 1500 for both housings, iirc.

Posted by: ArtechnikA Feb 4 2006, 06:27 PM

there's always Porsche's solution :-) ...

Posted by: Aaron Cox Feb 4 2006, 06:35 PM

as said above, wevo has a bearing retainer thing

Posted by: ! Feb 4 2006, 06:38 PM

Yes Alan...the 911 trans decided to give up second gear on a downshift.....there's another thread floating around on the tear down and clean up....

I've been looking at Wevo's site. Spoke with Hayden on the phone....nice guy...answers on a Saturday.....

I'm trying to avoid the 1500 dollar fix....obviously.

OK I'll bite.....

What's "porsche's fix"

user posted image

On the retainer from WEVO....I don't believe that this is a total fix for one that is already loose.....

Posted by: Aaron Cox Feb 4 2006, 06:39 PM

a new case

Posted by: sixnotfour Feb 4 2006, 06:53 PM

goose2 has a tranny in the classifieds 80 SC

Posted by: ! Feb 4 2006, 06:58 PM

YEAH...SAW THAT, Thanks...

Posted by: Headrage Feb 4 2006, 07:18 PM

QUOTE (Aaron Cox @ Feb 4 2006, 04:39 PM)
a new case

From what I've heard...

Posted by: ! Feb 4 2006, 07:36 PM

Yep....looks like what I'm leaning towards....

Posted by: Dr. Roger Feb 4 2006, 07:54 PM

I realize that I'm probably one of the most "Primitive Pete" guys around here but...

If your going to replace the case anyways, couldn't you scuff the outer area of the bearing race and the inside of the case and use some JB Weld around the contact area? You wouldnt be able to remove it once hardened but that's what you want... Once that race is gone, tha case would be gone...

Don't laugh, that stuff works minor miracles in high pressure situations.... =-))

Posted by: ! Feb 4 2006, 08:02 PM

When you look at how these transmissions have lasted....how they were originally built and the fact that the NEW parts are BEND OVER here they come.....you might want to consider the long term.

I've known of the race problem for years.....matter of fact Assholio (Brad) mentioned it a few years back....most shops will ball peen hammer the sides, or cut a keyway and set a check key in it....but they all fail.

I plan on keeping this ride for a LONG time and to do so, is to do it right.....CH from Renegade sent me a PM on a guy that MAY have an alternative.....will see what he says....but it's looking like a new upgraded/refurbished differential case from WEVO may be the right thing to do.....

HEY Roger...want those 3 inch spacers????

Posted by: J P Stein Feb 4 2006, 08:03 PM

Find a good machinist. Bore the hole .06 OS....on location.
Have em' make an OS new bushing.....shrink to fit.....2-3 thou interference... out of similar hardness material. WAG at about 500 bucks.
"New" case is at least 18 years old, eh?

Brad had another solution in a thread here.....a before "the troubles". Do a search.

Posted by: ! Feb 4 2006, 08:04 PM

http://www.wevo.com/wevoracecase.htm

Posted by: r_towle Feb 4 2006, 08:12 PM

I was gonna say get it machined round and press in a new oversized race.

They are obtainable...

BUT, I would go for the Wevo solution.

It seems alot more stable and alot less likely to wear out...Stainless bridle looks like the way to go.

Your in there, just do it once.

I like 914's, I just keep opening them till I found one that was tight...

But, with that one, its cheaper to fix what you got.

Rich

Posted by: rick 918-S Feb 4 2006, 08:23 PM

I would Grind a slot in the back of the race, install it with JB, then drill a keyway in the case using the slot you ground in the race as a guide. maybe 1/8", then install a 1/8" round key made from a drill bit shank to pin both pieces from moving. Use JB on the pin too. Sounds crude, but we used to do that to Aluminum case Muncie 4 speeds back in the day. They used to stretch the main shaft bearing hole causing the bearing to spin in the housing.

edit: BTW: By grinding the slot in the back of the race, installing it in the case, Then drill it inplace you aviod distorting the race.

Again, sound a little crude, but I've done it and drag raced with a case fixed like this.

Let the flames begin

Posted by: ! Feb 4 2006, 08:25 PM

http://tds.loctite.com/tds5/docs/660-EN.PDF

Posted by: Britain Smith Feb 4 2006, 09:53 PM

Please, whatever you do...do it correctly the first time. Instead of ruining the case with all your makeshift solutions, either sell the case with the knowledge that it needs fixing, get it fixed by WEVO, or brake down and find a good one. IMHO, there are less and less good cases around so don't screw up another one and get this one fixed.

-Britain

Posted by: ! Feb 4 2006, 10:06 PM

Downside....3 week turnaround on the WEVO upgrade....

I have to send the trans to him as it's cut/notched for the 3.6.....

Posted by: Aaron Cox Feb 4 2006, 11:02 PM

time for a g50

prolly in it the same amount

Posted by: SirAndy Feb 4 2006, 11:17 PM

QUOTE (Aaron Cox @ Feb 4 2006, 04:35 PM)
as said above, wevo has a bearing retainer thing

top quality, watched hayden putting it in ...

not cheap, but effective ...
Andy

Posted by: ArtechnikA Feb 5 2006, 07:56 AM

QUOTE ("*" @ Feb 4 2006, 08:38 PM)
OK I'll bite.....
What's "porsche's fix"

short bellhousing G50

Posted by: ! Feb 5 2006, 08:41 AM

Ah....the 1500 dollar for a core then rebuild it fix....OK....