SC Shift Coupler Question Help with ID and possible replacement suggestions
 

Had an annoying rattle so figured to replace shifter coupling, Ordered the OEM bushings but just now cracked open access panel and the coupler that is in there does not seem to be the OEM coupler. It is the source of the rattle tho.

Can anyone ID this coupler and advise if I can fix the rattle? Does not appear to be any bushings that I could replace....

If I need a new coupler - which one do I want? I am not into uber expensive replacement parts unless there is a real good reason to upgrade.

Pic of coupler attached ...Thxhttp://forums.pelicanparts.com/uploa...1423027525.jpg

Looks to be the Wevo
 

Welcome to Windrush Evolutions - WEVO - Porsche Products

Not 100% sure but it appears to be. Wevo is highly regarded (I think) - you might contact them before you buy a replacement and see what they say.

Look up the coupler whisperer.

The cheap and effective solution is to buy a used stock coupler that needs to be rebuilt (but doesn't have stripped threads) for around $25, and buy a pair of new bushings ($8) from our host. The cone screw, if it's missing from your used part (or masticated by a previous owner, the dirty animal), is another $4.50.

That is a wevo coupler and a $200 upgrade. I would look elsewhere for your rattle.

I'm no mechanic nor do I play one on TV...but is that a small ball bearing laying next to the rod?

Thx, Does look like the Wevo - but for sure the rattle is coming from the knuckle, I will email them to see whats up. As for the bearin, it is dab of something rubbery....

Not sure

If you sure the rattle is coming from that coupler wrap some good quality electrical tape around it. It will function normally.

Can you grease the knuckles? Have you used a mirror and lights to check out the bushings? The rattle could be the bushings, the feel of the shifting will also be degraded.

Check the bolt that holds the wevo joint to the shifting rod and try to tighten it some. The wevo only has a pin and I can't see that wearing out. There is a white shifter rod bushing on the other end and you have to remove the shifter to see it. You might want to look there as well.

Thats a wevo coupler. If its usable, use it. Its a significant improvement from my experience. If you have to replace, you can buy used and rebuild with new bushings, but have someone else do it for you. It can be a real PITA to press out the old bushing, or you may break the coupler if your me. if buying new, I have had good experience with the improved OEM style that is either aluminum or billet if I remember correct.

I dont think there are any bushings in the Wevo to service, this is a clip from their install instructions...

"You may experience a modest increase is transmission noise transmitted to the driver cabin, this is also normal and a result of the precision achieved by the elimination of the factory plastic bushings and lost motion in the O.E. architecture."

The noise maybe 'normal' but I am getting a fair amount of play from the coupling. I have emailed Wevo to ask.

Just learned one fix to shift rod vibrating was addressed in a Porsche Tech bulletin - directed at G50's but also applies to the 915, o-ring and zip tie to preload rod and stop vibrating - seems a bit bodgy but there you have it


G50 Transmission Rattle | PORSCHE Tech Tip Bulletin The Porsche G50 series gearboxes are know for rattle at idle in neutral gate position and lower rpms due to a idler gear in the nose cone of the transmission. A few design features used to suppress the problem included the rubber torsion hub clutch friction disc, a rubber tube (999 615 047 40) over the shifter shaft, a replacement bushing at the rear of the shifter housing, padded shifter rod in the tunnel, a rubber insulator washer on the gearbox shift coupler and a supplement rubber ring band around the shift lever and rod (999 701 969 40). The suspension mounting should also be checked to insure not worn out. An additional measure is a supplement additive to the gearbox oil. Please contact us for further advise and applications. BMD:14-11

Porsche Tech Tip:
On (1987-1988) model Porsche 911's which have a rattle noise coming from the shift rod, the installation of a rubber o-ring on the shift rod may help eliminate the noise. Install as follows;
1 - Remove shift rod coupling access plate.
2 - With shift lever in neutral, disconnect from shift rod from coupling.
3 - Move shift lever in 3rd gear position and slide rubber o-ring (part number 999 701 969 40) over front shift rod.
4 - Reconnect shift coupling.
5 - With shift lever in neutral, slightly tension the rubber ring with a nylon tie strap to the left side hand brake cable guide tube. The distance from the shift rod flange to the o-ring should be approximately 100mm.
6 - Reinstall the access plate. Road test car. If rattle noise is still audible, increase tension on the rubber o-ring slightly.
WEVO | G50 PSJ - Shift Joint Coupler

Just a note, or two.

I bought the OEM coupler from our host. The bushings it came with were as loose as the ones I took out of the car. I had also ordered the $8 bushings, just in case. I had a machine shop friend install them in my original coupler and they were MUCH tighter, though there is still a gap in the middle between the shift rod and the two bushing. Don't know if that will matter. If I had to do it again, I think I would opt for the delrin bushings.

I had also ordered a set of bushings from the 'coupler whisper's website. In early January I got a refund and this msg "Sorry not offering this right now - might again someday but not right now - all the best - Ed".

On the cone screw. There is a dab of some sort of loctite type stuff on the new ones, you can see it on the old ones also. I ordered new because the allen head on one of mine was a little loose/beat up. There are two of these screws in the shifting mechanism.

If it's loose, your coupler is probably worn and the Delrin bushings won't help. If anything, I imagine they would make the problem worse. When you put in new black bushings, the coupler should be so tight that it takes some effort to exercise the "wrist". It definitely should not be remotely floppy or loose.