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School me on oil pressure switches
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Bart Dunn
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PostPosted: Wed Jan 20, 2010 12:21 pm    Post subject: School me on oil pressure switches Reply with quote

I bought these a long time ago, and don't remember what for or why, but generally recall that they're NOS for a 36hp engine:

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Are there different ones over the years? This is the text stamped on them:

On the black plastic, around the screw terminal: "MESSMER RADOLFZELL" which I assume to be a brand.

Stamped on the hexagonal sides are:

0.6 -0.3 = ?
4 65 = date code, perhaps?
M10 x 1 = thread size & pitch, probably, but not sure.

Thanks in advance.
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PostPosted: Wed Jan 20, 2010 5:33 pm    Post subject: Reply with quote

If you remove the grounding screw, look inside the cavity. Is there another screw inside to adjust pressure?
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PostPosted: Wed Jan 20, 2010 8:53 pm    Post subject: Re: School me on oil pressure switches Reply with quote

Bart Dunn wrote:
Stamped on the hexagonal sides are:
0.6 -0.3 = ?
4 65 = date code, perhaps?
M10 x 1 = thread size & pitch, probably, but not sure.

I don't know the differences but the markings above are:
Pressure range in Bars, they are adjustable using the screw RareAir mentioned.
Date code
Yes, thread size.
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Motorhead55
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PostPosted: Wed Jan 20, 2010 8:55 pm    Post subject: Reply with quote

The switch loks like a 36hp switch. The 0.6-0.3 is the pressure in "bar" where the switch will close and make contact
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Bart Dunn
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PostPosted: Thu Jan 21, 2010 11:39 am    Post subject: Reply with quote

RareAir wrote:
If you remove the grounding screw, look inside the cavity. Is there another screw inside to adjust pressure?


Yes--the screw is in there. I've looked through the Bently chapter on the oil circulation system, and see nothing about actually using this screw to adjust pressure. I assume it's set at the factory to be the appropriate pressure, but . . .

I presume that a good way to check it is to run a oil pressure gague, and if the pressure is good and the oil light goes out appropriately when the switch is installed, all's well.
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PostPosted: Thu Jan 21, 2010 12:15 pm    Post subject: Reply with quote

Hopefully this won't be considered as too far off-topic for this thread. I have one of those style switches and it does leak a bit at the joint between the Bakelite and the metal housing. Does anyone have a repair technique for re-sealing them?
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PostPosted: Fri Jan 22, 2010 8:43 pm    Post subject: Reply with quote

The switch doesn't change the oil pressure the adjustment is for grounding to occur causiing the warning light to go on Smile
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