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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: mccarlk on August 07, 2009, 08:06:22 PM

Title: 1980 mci 5c speed sensor?
Post by: mccarlk on August 07, 2009, 08:06:22 PM
looked under the bus all over the auto trans and can not find a speed sensor, where does the speedo get the signal from?
Title: Re: 1980 mci 5c speed sensor?
Post by: Fredward on August 07, 2009, 08:10:12 PM
on my 5A it is electronic. There is a sensor on the driver's side front brake drum. Wire runs right up to the speedometer. Obviously not OE but I imagine after a couple million miles, the old drive cable wore out. (the current odometer reads 1,120,000 miles!)
Fred
Title: Re: 1980 mci 5c speed sensor?
Post by: Airbag on August 07, 2009, 08:32:48 PM
The MC5A stock speedometer

The electric speedometer consists of an electric sending unit driven by means of a short flexible shaft connected to the conventional drive. A four wire cable is connected to the sending unit and the indicator by A/N (army navy) type connectors. Battery current is supplied through a single wire to the brush holder on the sending unit. A grounding wire is connected to a ground terminal on the sending unit.

This is the poop from the 5A manual. should be close I hope.

My bad I see you have an auto ooooops.

(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi90.photobucket.com%2Falbums%2Fk249%2Fskywords%2Fspd1.jpg&hash=5bbd85a8b3be7c5fc827fd390e2160048591fe99)

(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi90.photobucket.com%2Falbums%2Fk249%2Fskywords%2Fspd2.jpg&hash=ef137acce6553ad2f4045ec9a6f63967853a80ee)

(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi90.photobucket.com%2Falbums%2Fk249%2Fskywords%2Fspd3.jpg&hash=39aca51a5b09ed4fe2b4d008d1e40847b1d3eb18)

Title: Re: 1980 mci 5c speed sensor?
Post by: jjrbus on August 08, 2009, 11:51:06 AM
On my 79 5C the original speedo ran off a sensor which obtained signals from magnets attached to the driver side brake drum. The wire ran to a "pillbox" and then on to the speedometer.

When I started haveing problems with it, I replaced both the pickup and speedometer head at a cost of about $200, it really was the easy way out.   I replaced it with a Dixon speedometer with odometer.

According to the service manual the bus can be equipped with two types of speedo. The first tool you should obtain with these beasts is a service manual!!    JIm
Title: Re: 1980 mci 5c speed sensor?
Post by: Lin on August 08, 2009, 12:16:44 PM
GPS speedometers are an option also.  This one has heads up display.

http://www.dealextreme.com/details.dx/sku.13935 (http://www.dealextreme.com/details.dx/sku.13935)
Title: Re: 1980 mci 5c speed sensor?
Post by: Ncbob on August 10, 2009, 03:18:13 PM
Mac, I've changed speedometer drive generators twice and still have a 10% error.

I just stick the old Garmin GPS on the left side of the windshield and when I find the groove that keeps me
'tween the big truckers and the people powered roller skates I just check the tach and hold 'er there for the whole trip. I don't run with the crowd...I find an interval that's safe and comfortable for me with plenty of
braking room. Unless I'm running with Jack Conrad....that's where the big dogs have to sit on the porch!

NCbob
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