| [GMCnet] Fwd: GMC Waste Tank [message #202599] |
Mon, 25 March 2013 10:25 |
emerystora
Messages: 4442
Registered: January 2004
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Senior Member |
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> From: Emery Stora <emerystora@mac.com>
> Subject: Re: GMC Waste Tank
> Date: March 25, 2013 10:20:06 AM CDT
> To: Ronald Roman <Roman_Ronald@solarturbines.com>
>
> I replaced my sender recently. The screws are definitely NOT metric. I think that the threads per inch are the same as one of the metric screws but the screws are english thread. Probably something like 10-32. I know that they were fine thread.
>
> You can check the sender with an ohm meter. There is a coil inside the housing with a "wiper" contact. As you move the arm it will go from 0 ohms to 90 ohms.
> I really doubt that they are any good. The problem is that the liquid will leak under the seal on the shaft and will corrode the inside.
>
> There is a replacement available that bolts right in. It is a magnetic gauge. The electronics are sealed in the gauge on the outside of the tank. The float is attached to a magnet. That magnet moves the inside of the gauge. That way it is completely sealed from the liquid in the tank.
>
> I put one of these in about 15 years ago but the shaft in the tank finally corroded to the point where it bend and when I tried to straighten it I broke it off. Jim Kanomata sells the gauges. It is not cheap. He is getting $119.70 for it. I just ordered it and installed it about 3 months ago. He also has one like it for the water tank.
>
> http://www.appliedgmc.com/prod.itml/icOid/839
>
> It comes with screws and the gasket.
>
> For those cracks I would think you would be better to try to melt them closed rather than use epoxy. Try taking a soldering gun and working it over the cracks. The plastic should melt and fill the cracks fairly easily. Don't make the groves too deep though because you want the gasket to seal the flange.
>
> When you get the screws you can check the threads and use a tap to clean out the holes in the flange. I didn't use the screws from Applied GMC. I went to an Ace hardware and bought stainless steel screws that had a socket hex opening in the top of the screw so I could use an allen wrench to tighten them in. This was a lot easier than trying to use a screw driver under there and reaching over my head.
>
> Emery
>
>
> On Mar 25, 2013, at 9:33 AM, Ronald Roman wrote:
>
>>
>> Hello Emery,
>>
>> This weekend I crawled under the motorhome to have a better look at the
>> waste tank. The tank was leaking from the sending unit so I removed it to
>> have a better look. I am not sure if the leak was from the gasket or the
>> small cracks at the sending unit mounting holes. The screws at the bottom
>> of the tank were rusted and the screws at the top still had threads. I
>> checked the screw threads and they were Metric which I found a little
>> strange. Do you have any information on the screws ?
>>
>> Here are some pictures of the tank and sending unit. I think the cracks can
>> be filled with epoxy please let me know what you think. Also is this the
>> original sending unit and how can I check it to make sure it works ?
>>
>>
>> (See attached file: Waste Tank.JPG)(See attached file:
>> Thanks,
>> Ron
>>
>
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