B2410 RPM spedo cable

beerbeer95648

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Feb 14, 2020
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I'm having an issue where my b2410 will not register above about 1500 RPM. Audibly the RPMs are increasing. I can see the throttle linkage moving its full range of motion at the injector pump. I assumed it was my Speedo cable so I replaced that with a factory OEM cable. No change. Any thoughts?
 

Dave_eng

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M7040, Nuffield 465
Oct 6, 2012
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Disconnect cable at engine end and rotate with cordless drill. Change rpm's slowly.
If instrument continues to act same way I have seen instruments where spiders have gotten inside and inhibit the needle movement.

I have some improve completely by bright left in the bright sun which seems to desiccate the tiny spiders.
B2410 instruments.jpg


Dave
 
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beerbeer95648

New member
Feb 14, 2020
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Placerville
Disconnect cable at engine end and rotate with cordless drill. Change rpm's slowly.
If instrument continues to act same way I have seen instruments where spiders have gotten inside and inhibit the needle movement.

I have some improve completely by bright left in the bright sun which seems to desiccate the tiny spiders.

That's agood idea. I'll try that and report back.
View attachment 133888

Dave
 

beerbeer95648

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Feb 14, 2020
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So with the drill attached to the cable I get nothing at the dash. I pulled the dash and it looks like the speedos square ed that fits into the gauge behind the panel is a sloppy fit. Everything spins but when I attach it and make sure the cables fully inserted into the sheath and into the gauge nothing happens even a high speed on the drill. Is it possible the female portion of that coupling is wallowing out and not engaging the needle on the gauge? Can't find that part available for replacement.
 

beerbeer95648

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Feb 14, 2020
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Placerville
So with the drill attached to the cable I get nothing at the dash. I pulled the dash and it looks like the speedos square ed that fits into the gauge behind the panel is a sloppy fit. Everything spins but when I attach it and make sure the cables fully inserted into the sheath and into the gauge nothing happens even a high speed on the drill. Is it possible the female portion of that coupling is wallowing out and not engaging the needle on the gauge? Can't find that part available for replacement.
Sorry all, anyone have any insight on this?
 

PoTreeBoy

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Mar 24, 2020
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Sorry all, anyone have any insight on this?
Are you running the drill the right direction? It won't work backwards.
Sometimes you have to push the cable in a little to engage it. If it's running up to 1500 rpm, I doubt that's the problem.
The cable spins a magnetic clutch arrangement that acts against a spring, it's not a direct connection to the needle.
 

beerbeer95648

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Feb 14, 2020
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Placerville
Thank you all yes I believe it was the right direction. But I will double check this weekend. Yeah I was afraid it was the gauge cluster.
 
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