IML: Oil Pressure Sending Units

[randalpark@xxxxxxx]

They don't generally leak from being loose. They leak from an internal rupture that allows the oil to pass through, and escape out the seams of the unit. The problem with the bigger one is that it is a large "bell" shaped item with a pressed edge that can allow a large amount of oil to escape rapidly when it fails. My experience with the smaller ones is that they can fail, but they don't usually expell as large of amounts of oil over a short time. 

 

It sounds like the poster may not be aware that the oil pressure sending unit operates by filling with oil. Older Imperials (through 1956) had a hose that went through the firewall and connected directly to the gauge. When the hose ruptured, massive amounts of oil were suddenly pumped out of the engine, and frequently sprayed hot engine oil on the driver's pants legs.

 

Paul W.

 

-----Original Message-----
From: fljoslin@xxxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Fri, 28 Jul 2006 11:54 AM
Subject: Re: IML: catastrophic oil loss

Thanks:

 

The thought had crossed my mind. I am not exactly sure what has failed at this point since I cannot get the sending unit out. It is certainly not loose. I will look into replacing both units.

----- Original Message -----
From: randalpark@xxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: catastrophic oil loss
Date: Fri, 28 Jul 2006 11:37:41 -0400

Excellent advice since the larger of the two is the one that usually fails.

 

Paul W.

 

 
-----Original Message-----
From: vm.dude@xxxxxxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Fri, 28 Jul 2006 7:56 AM
Subject: RE: IML: catastrophic oil loss

And the lesson here:  both senders are the same age.  If that one went, you
might as well change both of them while you're back there and have the tools
out, and not have to worry about a repeat performance.

--Brooks in Dallas

-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Pete Engel
Sent: Friday, July 28, 2006 8:42 AM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: catastrophic oil loss

Fred,

The Safeguard Sentinel "sensor" is really just a plain old oil pressure
switch.  There's a special socket designed for removing/installing the
things.  In fact, there are quite a few different sockets made just for oil
pressure switches/senders and every time I think I have all the ones I need
a new style switch/sender is released.  Figures.  Anyway, you will have a
lot of difficulty removing that switch using a plain 12 point socket of any
size.  I suggest that you buy one of the sockets or find someone who will
loan you one.  Any NAPA store will have on on the Lisle rack.

The switch is simply a steel housing with a reinforced rubber diaphragm,
electrical contacts, and a spring.  On the day the leak started it was
simply time for that rubber diaphragm to give up the ghost.  No special
circumstances needed.  The usual failure mode is a slow but presistent leak.
Yours was just a bit more dramatic.  Maybe the black bakelite upper part is
cracked allowing greater leakage.

Pete in PA


From: "Frederick Joslin" <fljoslin@xxxxxxxx>
Date: Thu, 27 Jul 2006 20:05:33 -0500
Subject: Re: IML: Catastrophic oil loss

It appears that the Safeguard Sentinel system sensor is leaking. The
sensor is in very tight and I will have to work on getting it out. Weird
that all of a sudden it would start to leak. It appears that no damage
was done to the engine (I hope) so I feel very lucky.





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