Home » Public Forums » GMCnet » [GMCnet] speedometer cable lube
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| Re: [GMCnet] speedometer cable lube [message #59633 is a reply to message #59628] |
Sat, 10 October 2009 15:41   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Your correct, pop off the rear cover and access the cable.
On Sat, Oct 10, 2009 at 12:31 PM, Mary Ann Kjellerson
<zworst123@yahoo.com> wrote:
> My speedometer bounces around a lot and I would like to lube it but don't know who to get
> to the back of the dash to unscrew it, someone told me that I cannot lube it by disconnecting
> it from the xmission/drive line, please help!
>
> Don Kjlellerson
>
>
>
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Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] speedometer cable lube [message #59634 is a reply to message #59628] |
Sat, 10 October 2009 15:43 |
David L Greenberg
Messages: 899
Registered: January 2004
Location: Port St Lucie, FL
Karma: 0
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On Sat, 10 Oct 2009 12:31:34 -0700 (PDT) Mary Ann Kjellerson
<zworst123@yahoo.com> writes:
> My speedometer bounces around a lot and I would like to lube it but
> don't know who to get
> to the back of the dash to unscrew it, someone told me that I cannot
> lube it by disconnecting
> it from the xmission/drive line, please help!
>
> Don Kjlellerson
>
>
> I doubt lubing it is going to solve your problem
I had the same problem with the speedo in my Packard. The cable wasn't
broken (too bad - only $100 for new) The speedo was shot ($197 for a
rebuild) probably a lot less for a GMC, however.
Try removing the screws on each end that hold the top of the dash panel
in place. When you unscrew the cable, take a drive and see if the cable
turns smoothly. If it does you may have a speedo issue. Just my (Usually
inept) assessment of the problem
David Lee Greenberg
Port St Lucie, FL
Dedicated to the Preservation of the Classic GMC Motorhome
http://GMCmhRegistry.com
48 Packard Super Eight
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| Re: [GMCnet] speedometer cable lube [message #59654 is a reply to message #59628] |
Sat, 10 October 2009 18:22 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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If it bounces in an even time relative to the speed of the vehicle its the cable(s) If it bounces all over at random and on bumps then the damping is shot on the speedo head itself and it needs to go in for service. If cables are dry, then lubing will probably fix it. If they are worn out it won't. I'd lube first and you will probably get lucky. There should be a little tab to press with your finger to unlock the cable from the head (IIRC as it is that way on most GM)
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] speedometer cable lube [message #59656 is a reply to message #59628] |
Sat, 10 October 2009 18:33 |
larry.whisler
Messages: 356
Registered: August 2005
Karma: 8
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Don,
Does your coach have cruise control? If so, you will have two cables that are linked to the speedometer from the transmission,
a lower cable and an upper.
I had the same problem of the speedometer jumping as well as the cruise acting erradically. The problem was with the lower cable.
I tried lubricating the lower cable but it did not correct the problem. After removing the cable, I could see why it was binding. Part of the cable casing was missing and the inside was full of rust.
larry whisler
[Updated on: Sat, 10 October 2009 18:37] Report message to a moderator |
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| Re: [GMCnet] speedometer cable lube [message #59659 is a reply to message #59656] |
Sat, 10 October 2009 18:55 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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The short cable from trans. to the cruse is burned by the exhaust pipe
and can bind up. We replace lot of them and also sell several a month.
On Sat, Oct 10, 2009 at 4:33 PM, larry.whisler
<larry.whisler@hotmail.com> wrote:
>
>
> Don,
>
> Do your coach have cruise control? Â If so, you will have two cables that are linked to the speedometer from the transmission,
> a lower cable and an upper.
>
> I had the same problem of the speedometer jumping as well as the cruise acting erradically. Â The problem was with the lower cable.
> I tried lubricating the lower cable but it did not correct the problem. After removing the cable, I could see why it was binding. Â Part of the cable casing was missing and the inside was full of rust.
>
> larry whisler
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] speedometer cable lube [message #59677 is a reply to message #59628] |
Sat, 10 October 2009 20:31 |
Steve Bonfoey
Messages: 10
Registered: April 2006
Location: Peoria, Illinois
Karma: 0
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Junior Member |
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The speedometer does not unscrew. A clip holds it in place. You can depress the tab on the clip and it will easily detach.
You must access the speedometer end because you can pull the speedometer drive worm out of the cable from that end. You probably can then pull the worm out of the cable without fully removing the entire cable.
Before you do this check to see if you can pull the worm out of the transmission end. In my case it had to be the speedometer end.
Steve Bonfoey
1976 Eleganza
Peoria, Illinois
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| Re: [GMCnet] speedometer cable lube [message #59700 is a reply to message #59628] |
Sat, 10 October 2009 22:36 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| Mary Ann Kjellerson wrote on Sat, 10 October 2009 14:31 |
My speedometer bounces around a lot and I would like to lube it but don't know who to get
to the back of the dash to unscrew it, someone told me that I cannot lube it by disconnecting
it from the xmission/drive line, please help!
Don Kjlellerson
|
It can, as stated, be the cable(s) or the speedo head, but it can also be the cruise module going bad mechanically.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] speedometer cable lube [message #59737 is a reply to message #59656] |
Sun, 11 October 2009 11:32 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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On Oct 10, 2009, at 5:33 PM, larry.whisler wrote:
>
>
> Don,
>
> Do your coach have cruise control? If so, you will have two cables
> that are linked to the speedometer from the transmission,
> a lower cable and an upper.
>
> I had the same problem of the speedometer jumping as well as the
> cruise acting erradically. The problem was with the lower cable.
> I tried lubricating the lower cable but it did not correct the
> problem. After removing the cable, I could see why it was binding.
> Part of the cable casing was missing and the inside was full of rust.
>
> larry whisler
That is a good point, Larry.
One other suggestion for Don is to disconnect the longer cable from
the cruise control and connect it directly to the transmission. Drive
the GMC and see if the problem goes away. If it does then you will
know that the problem is either with the short cable or with the
cruise control mechanism.
Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] speedometer cable lube [message #59764 is a reply to message #59762] |
Sun, 11 October 2009 14:38 |
Dave Motorhome
Messages: 175
Registered: July 2007
Karma: 2
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Senior Member |
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I will look, I think final drive is stock, .. my wife called and
yelled at me.. i was traveling 75( i thought 60), she was following
and said .... well cant say it here.
David
75 Glenbrook
Broken Arrow, OK
http://75glenbrook.googlepages.com/
On Sun, Oct 11, 2009 at 2:32 PM, Emery Stora <emerystora@mac.com> wrote:
>
> On Oct 11, 2009, at 1:29 PM, David wrote:
>
>> I did that, now my speedo is not bouncing, but my speed is off by 15
>> at 50 mph.. seems odd?
>>
>> David
>> 75 Glenbrook
>> Broken Arrow, OK
>> http://75glenbrook.googlepages.com/
>
>
> Do you have a lower ratio final drive? If so then you probably have a
> "speed correction unit" either at the transmission or at the end of
> the short cable. This is a small box with gears inside that is
> inserted into the line at some point.
>
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>
>
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| Re: [GMCnet] speedometer cable lube [message #59786 is a reply to message #59764] |
Sun, 11 October 2009 17:04 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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On Oct 11, 2009, at 1:38 PM, David wrote:
> I will look, I think final drive is stock, .. my wife called and
> yelled at me.. i was traveling 75( i thought 60), she was following
> and said .... well cant say it here.
>
> David
> 75 Glenbrook
> Broken Arrow, OK
>
What tires and wheels are you using. That can also throw the
speedometer off. However, if you were reading correctly before you
attached the main speedometer directly to the tranny then you must
have a speed correction device in line.
Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] speedometer cable lube [message #59863 is a reply to message #59628] |
Mon, 12 October 2009 10:49 |
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Ok I just had this problem, turned out my transducer for the CC had siezed up, causing my speedogear to round. I bypassed the transducer and plugged the long cable directly into a new speedo gear. I found this also cured my speedo bounce. so maybe your CC transducer is getting ready to take a dump, id check it.
disconnect the speedo cable (short) from the tranny, and spin it it should turn freely, if it snags, disconnect it from the transducer and trist again, if it moves freely then its the transducer, if it binds its the cable. mine siezed totally and would not move at all.
Shan
PS, make sure your gov housing clamp is on, had mine pop up when I put in the new gear which caused the gov to disengauge. the tranny isnt to happy without that little weight, and will not wanna go anywhere fast. when I re sat the gov, it then worked fine, and best of all, no more speedo bounce...
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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