Broken Brand-New Speedo Angle Drive

[JBBenson]

So, installed a new angle drive to fix my original that was leaking. Went for a drive out to the desert, doing the "Pines to Palms" highway, and on the way there my speedo stopped working. Also meaning my odometer stopped working too, which I use to gauge when its time to fuel.

 

Huh.

 

Well, no biggy, I can drive without a speedo. I drove another 140 miles and arrived in Thermal, CA.

 

So I removed the angle drive and spun the cable, and the speedo jumped. So, the cable isn't broken.

 

Then I removed the angle drive and saw this. The angle itself is frozen, it won't turn at all.

 

So the question is: anybody run into this? Do I remove the chrome-nut-drive-housing on the transmission and pull the assembly out? What does the assembly look like? Can I drive home with it like this? I hope that the metal drive stud, when it breaks, DOESNT fall inside the transmission.

 

Anybody know?

 

[docc]

Nope, never seen that before. (And I've rebuilt five or six of these angle drives.)

 

That looks like a "replacement" part and not OEM?

[JBBenson]

Not sure if replacement or OEM, I got it from MG Cycle.

[docc]

I think that is their generous replacement offering after the Guzzi part went NLA.

[docc]

Seems the tip of your "driving shaft" twisted off. It will be trapped in the mechanism that turns the shaft out of the gearbox. Stand by: trying to get images posted . . .

[docc]

Full lower square tip on the connector shaft:

[docc]

So, the torn off tip has to be trapped in the spindle drive/ pinion from the gearbox. Pretty sure it can't fall into the works (?)

 

Here are the parts: [per guzzimeister: missing is the thrust washer.]

[docc]

If you're on the road hoping to make it home,  pull the torn "driving shaft" out of the locked angle drive and reassemble. 

No cable drive, but get home.

[docc]

Properly seated, the short "driving shaft" sits fully into the "pinion" from the gearbox (spinning through the "housing" on the left):

[JBBenson]

These photos are really helpful, thanks Docc.

 

That broken angle drive post absolutely won't come out. Will that silver washer come out easily? Then maybe I can rock it back and forth a bit.

 

I have put the bike in gear and peered down the hole while rolling the bike back and forth. I think I can see something turning in there. If so, that's good. But yes, there must be a piece stuck in there.

 

If I remove this, what can I expect to see? That longitudinal gear and post sticking up? To receive the post sticking down from the angle drive?

 

[JBBenson]

Update, just got it out...!

 

Wait, OK I think I got it. So that photo with the green background, that's what I will see if I remove the chrome nut from the transmission...

 

Got it.

 

Wondering if I should do this on the road. I would feel better if I found and removed the broken piece.

 

However, if I remove the chrome nut and the broken piece falls further into the transmission, that will be the start of a very bad day.

 

Very bad.

[guzzimeister]

Hi

 

be very careful if you are lifting the drive shaft with the worm gear up out of the gearbox. There is a thrust washer underneath it which can (will) fall into the gearbox.

 

The angle drive is not essential. Later V11s had a drive cable screwing directly into the gear box with out the angled drive. Angled drive virtually unobtainable now.

 

I would check the lubrication of the drive cable itself. I greased mine after two drive failures and never had another one. They are poxy weak little things anyway.

 

Cheers

 

Guzz

[JBBenson]

Thanks for the tip.

 

Where is the thrust washer in this schematic?

 

[JBBenson]

The angle drive is not essential. Later V11s had a drive cable screwing directly into the gear box with out the angled drive. 

 

Meaning this one, from a later V11 Lemans, can screw directly into the transmission?

 

[BLIGHT]

Speedhut GPS speedo... Simply the best. Get a matching tach too!