Re: [MV] Temperature Sensor on MB/GPWs
Tue, 19 Oct 1999 09:47:15 -0400 (EDT)

Herb, I will check my engine tonight, But I think the sender uses a 3/8" NPT or a 1/2" NPT thread. There is no such thing as a helicoil for a tapered pipe thread. A good machine shop should be able to salvage your original threads. If not they can always tap the pipe thread to the next larger size and use a pipe bushing. You can easily test your temperature gage on your kitchen stove in a pot of heated water. Use a known to be good thermometer to check it against. There is no electrical connection since this is a mechanical gage. Repros are available, but I have yet to see one like my original. Maybe it wasn't original anyway.

Dave Fillman
45 MB

---- you wrote:
> I have been working on my 1945 MB for a number of years and just now getting
> to the engine. The engine hasn't been operational in over 10 years.
> A past owner had installed a pipe fitting and a pipe "Tee" in the engine
> head where the bulb of the temperature indicator is installed. I suspect
> this was intended to accommodate a heater?
> In my rebuilding process, I attempted to get the pipe fitting out using lots
> of liquid wrench. However, the pipe fitting (nipple) sheared off. I plan
> to take it to a machine shop, and have it to drilled out and retaped or if
> necessary get a heli-coil (spelling?) installed.
> Before I do this, I wanted to know the proper thread size for this sensor
> fitting in the head. Unfortunately, I do not know if the current tubing and
> bulb on the temperature indicator I have is standard. It is quite possible
> that some things were modified. -- I have two questions?
> 1) Anyone out there know the proper thread size?
> 2) Also, the temperature indicator glass is cracked, and status of tubing
> and bulb are very questionable. Is there someone that rebuilds these, or is
> it better to buy a replacement?
> Thanks in advance!
> Herb
> ______________________________
> Herbert Brown
> Institute for Defense Analyses
> 1801 N. Beauregard St.
> Alexandria, VA 22311-1772
> Phone (703) 845-6663
> FAX (703) 845-6788

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