Cat 3126 Oil pressure transducer

[ktcanuck]

I recently motored my new-to-me 420AC back from Florida to its new home in Ontario Canada. En route I did my pre-departure check one morning to discover a large quantity of oil under the starboard engine. The cause was a pressure transducer on the inboard side of the starboard engine weeping oil out of the top. Not being close to a Cat dealer and needing to move we removed the transducer and plugged the hole and filled with as much suitable straight 30W oil as was available at the location. I later in the day was able to fill fully.

The point of this tome, and my question, revolves around the fact that instrumentation was unaffected. Oil pressure still reads as before and the oil pressure alarm quietens once the engine starts as before. So what did this transducer do and do I really need to replace it?

Keith

 

[Odyssey]

you called it a transducer. Is that the same as a sender? I looked it up on the web and it showed me pics of an oil pressure sending unit.

RB

 

[BonBini]

You have non Cat instrumentation, that’s why it was not effected.

Sounds like the “transducer” in question is on the left side of engine.

Tell me if you’ve got Mechanical engines or Electronic?
How many wires on the “transducer” and color if possible?
I’ll try to tell you what its for…

 

[osd9]

They are mechanical 3126TAs (assuming stock originals or original replacements). The oil sending unit to the helm oil pressure guage looks like this...

There is also a full flow mechanical guage mounted on the motors that you can see in the pic below....

I don't have a pic of the connection to those guages.

The point is, if the issue is with the guages mounted on the motors, then the helm guages wouldn't be effected.

Also, keep in mind....my motors are V-drive....On straight drives, some of the ancillary stuff will mounted on the opposite side.

 

[quality time]

I just replaced one of mine this weekend. I accidentally ordered the wrong sender and it definitely affected my helm readings.

 

[osd9]

Aaron....the electrical oil pressure sending unit is connected to the helm guage. That's the sending unit in the first pic in my post above. That sending unit will ONLY affect the helm guage and NOT the motor mounted guage.

The Full flow mechanical motor mounted oil pressure guage is connected elsewhere. I don't have a file picture of that connection.

The two oil pressure guages are totally independant of each other.

 

[quality time]

I know Dom, I was confirming to the OP that if we are talking about the same sender - it will affect the helm gauge.

 

[ktcanuck]

OSD9: Thanks, I didn't even think of the engine mounted gauge. Now, the top picture IS the one I am referring to. So in my case it must be the one that drives the engine gauge not the helm. I will confirm this at the weekend.

Thanks all. I will replace it.

 

[ptitchuisse]

They are mechanical 3126TAs (assuming stock originals or original replacements). The oil sending unit to the helm oil pressure guage looks like this...

There is also a full flow mechanical guage mounted on the motors that you can see in the pic below....

I don't have a pic of the connection to those guages.

The point is, if the issue is with the guages mounted on the motors, then the helm guages wouldn't be effected.

Also, keep in mind....my motors are V-drive....On straight drives, some of the ancillary stuff will mounted on the opposite side.

Hello,
Unrelated question as I am changing my impeller on cat 3126 for the first time. Do you disconnect the oil sender on the picture to get the impeller bolt in and the impeller out?
On the stb side (easy one) the oil sender is up, so not on the way, but on the port side, it is like on the picture. I am already crawling behind the engine and not sure if I should disconnect, replace impeller, reconnect?
Someone has suggested to remove the unit, but again very low accessibility and not sure what/how bolts to remove to easily remove the impeller pump unit

Thank you a lot!