Shift coupler...can I mess things up adjusting?

[H.G.P.]

I can shift smoothly in all the lower gears. However, shifting into fifth is exteremely difficult without removing the back shield, reaching down and rotating the rod myself by hand. I have to reach back from the drivers seat and rotate the rod clockwise slightly. Bushing is good. Can I mess things up by adjusting the vertical "pin" screw? I don't want to fool around and mess up my other gear locations. The search I did one post I believe mentioned something about being careful with this pin??




69 911 "Little Bull"

[Roland Kunz]

Hello

But you ain´t have troble shifting into 4th ?

Yust try to readjust the shifter.

Mark the position and lose the clampbolt then rotate it ahead to have enough way.

Also adjust longtitunal as the shifterposition my not have enough way to pull into 5th.

Check your shifter links and other relatet parts for excessive wear.

Grüsse

[Jim Sims]

The pin is actually a set screw with a tapered nose which registers in a hole on the side of the shift rod coming out of the transmission. It doesn't provide any shift adjustment but instead takes up play/tolerance in the joint at that end of the shift coupler and transfers shear loads across the joint. The shift adjustment is done using the other end of the coupler that has the bolt and nut. There is a tendancy for people to overtighten these set screws in a vain attempt to compensate for worn plastic bushings in the shift coupler. The internal wrenching socket becomes rounded during this overtightening, making it difficult to remove the set screw in the future. The threads on the side of the set screw have a plastic insert which keeps the shift coupler from loosening; there is no need to excessively tighten the set screw. Cheers, Jim

[H.G.P.]

Thanks Roland and Jim. I briefly went out in the garage and took a "look see" of that coupler again. I won't touch the vetical "pin" to the rear. I assume the nut and bolt you refer to is the one about six inches or so forward of the "pin", in the same housing between the rear seats. One other note: when I move over to reverse or to 1st, I can feel a "spring loaded" feedback in shifting. However, when moving to fifth, am I supposed to also feel a "spring" also?

(And yes, Roland, your correct about 4th gear too!)


Thanks.


69 911 "Little Bull"

[Jim Sims]

Yep, that's the bolt and nut (runs approximately horizontal side to side). There should also be a serrated "Schnorr" Belleville type lock washer under the nut too. To adjust the coupling loosen the bolt and nut and use a tool (like a big screw driver) the slightly spread the ears (the ears are what the bolt passes through) on the pinch clamp piece. Then the coupling can be rotated and the horizontal shift linkage rod (going forward in the tunnel to the front shifter) moved in and out of the shift coupling to make adjustments. I'm not too familiar with the early shifters/901 transmissions but I believe the spring loaded feeling is the reverse lockout system (keeps one from shifting into reverse by accident) for reverse and the operating sleeve snapping over the synchro in first gear. Fifth gear has a synchro and should feel somewhat like first gear but more like 2nd through 4th gears. Cheers, Jim

[H.G.P.]

Thanks Jim! Much clearer now. I'll go out and adjust tomorrow. Appreciated.



69 911 "Little Bull"

[Roland Kunz]

Hello

The "pin" in the rear needs a 3mm hex driver and is the way to lose the trany without touching the adjustment.

Scripe a mark on the joint so you can find a way back if you get lost.
The adustment is very sensetive and the perfect adjustment iswithin a 1-2 mm field on the rod.

Grüsse

[H.G.P.]

I just came back in from analyzing that rod and coupler again (didn't have as much time today to work on it as I was all excited about obtaining this new ignition switch)

I see that when I loosen the bolt (not the pin), I can move the rod BOTH forward and back, and side to side Is this correct?

So before I do the above, I should mark (Roland), the location on the rod, (the location and the current distance), where the bolt is in relationship to the coupler. ?



Thanks


69 911 "Little Bull"

[Roland Kunz]

Hello

Yes mark the positon with a scribe or make a color dot so you know where to start all over when you get lost.

Grüsse