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Old 08-01-2014, 08:28 AM   #1
Thorazine OP
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'74 R90/6 Tach cable end working loose

Have I been missing a sleeve or something all this time (like at the tranny end of the speedo cable)? My tach cable has worked loose of the port in the timing chain cover. I see the collar is indented to be held in place somehow, but that screw to the left ain't doing it. Still slips right out. This high quality photo shows what it looks like right now. What's missing? Thanks.

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Old 08-01-2014, 09:13 AM   #2
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iirc.... that indent in the tach cable should accomodate the body of the bolt, keeping it from getting pulled out. (Same thing happens at the transmission cable on the tranny.) The rubber boot goes where the cable comes out through the casting.

I will look to see if I have any pics that say otherwise....

from our ole fren MAX:



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Old 08-01-2014, 09:57 AM   #3
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Yeah, I saw the same illustration on A &S, thanks. The rubber boot is where it's supposed to be. You can barely see it near the top (cracked and worn--not available right now). I'm more curious whether there's some sleeve that the cable fits in that cavity, or maybe a sleeve that fits over the securing bolt to the left?
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Old 08-01-2014, 10:27 AM   #4
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Yes, there is a black plastic sleeve with a notch for the bolt that should hold your cable centered in that hole. It's there on the cable in the fiche picture. Is there any possibility it's been jammed further down the hole?
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Old 08-01-2014, 10:35 AM   #5
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Good eye ! I hadn't noticed in the pic that it is NOT there....

Yes, that black plastic "spacer" would certainly be key... it is part of the cable assembly.

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Old 08-01-2014, 11:21 AM   #6
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Quote:
Originally Posted by Big Bamboo View Post
Yes, there is a black plastic sleeve with a notch for the bolt that should hold your cable centered in that hole. It's there on the cable in the fiche picture. Is there any possibility it's been jammed further down the hole?
Good eye, Bamboo! Shit. I think it is jammed in there. It seems to feel like softish plastic, but I can't back it out with any dental picks. Letting the Liquid Wrench soak in, hopefully to dilute some of the crud holding it in.

Thanks. Mo later.
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Old 08-01-2014, 12:20 PM   #7
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Found a pic on ebay:


I don't think anything's jammed in the cavity. I think it's gone. I can't feel anything plastic-like. But in the pic, the sleeve seems to look more like it's made of metal. Will keep trying (until enough sweat drips in my eyes, working in the 95 degree garage).
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Old 08-01-2014, 12:51 PM   #8
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You are missing the bushing # 11 31 1 250 186 bush $9.75 from Max BMW.
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Old 08-01-2014, 12:56 PM   #9
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...and possibly a new tach cable seal, if the "dental picks" didn't work.
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Old 08-01-2014, 01:07 PM   #10
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Part #9. The number that was posted by Pokie. One of the rare instances that a part seems to be shown twice in the diagrams. It is here shown as part of the camshaft and earlier it is part of the tach cable.
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Old 08-01-2014, 04:53 PM   #11
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Quote:
Originally Posted by Pokie View Post
You are missing the bushing # 11 31 1 250 186 bush $9.75 from Max BMW.
Yup. That's it.

Quote:
Originally Posted by Big Bamboo View Post
...and possibly a new tach cable seal, if the "dental picks" didn't work.
That thought hit me once I cleaned all the gunk off--that #8 sure looks a lot like the cam seal. That's what's stuck in there good and tight, as it should.

Quote:
Originally Posted by disston View Post
Part #9. The number that was posted by Pokie. One of the rare instances that a part seems to be shown twice in the diagrams. It is here shown as part of the camshaft and earlier it is part of the tach cable.
Yup. So it seems the boot has been keeping the cable in place the whole time. I'll take that luck, thanks.

Ordering the part as you read this.

Thanks all.
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* Posts submitted under the moniker Thorazine are for entertainment purposes only, and may include exaggerations, prevarications or bald-faced lies. -- Thorazine - '74 R90/6
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Old 08-01-2014, 08:42 PM   #12
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The part in question on my bike has been broken for maybe the entire 15 years I have owned it. It's cracked in half but it's all still in place. I don't think it actually does anything but now that I know where to find it on the parts diagram I guess I'll replace mine too.

Also, about the tiny oil seal, I don't think they leak very often.
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Old 08-01-2014, 08:55 PM   #13
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The "simple" solution could be to cast-in-place some sort of silicone/caulk to simply hold the cable where it should be. I didn't know that that particular piece of plastic could be ordered separately!

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Old 08-01-2014, 08:59 PM   #14
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Quote:
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Also, about the tiny oil seal, I don't think they leak very often.
Back when I took my timing chain cover off to change the leaking gasket, I changed the cam and crank seals, but saw no signs of any leakage at that seal (which explains why I had no clue there was one there )
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* Posts submitted under the moniker Thorazine are for entertainment purposes only, and may include exaggerations, prevarications or bald-faced lies. -- Thorazine - '74 R90/6
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Old 08-01-2014, 09:04 PM   #15
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Originally Posted by bpeckm View Post


Also, I've been trying to get a replacement for my cracked boot (part #3 above) for a year or so, but they've never been available. Asked again today when I ordered the sleeve--still no. Guess I'll hit up Stoner, then who knows where?
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