Oil Pressure Line ??

supercub

MEMBER

Let me check my GPS, gee how'd we ever navigate w

• Oct 9, 2019

• #1

Curious what most are doing for running the oil pressure line. Are you using a flex hose with a firewall fitting. Or a short flex hose off the engine into a copper line running through a grommet at the firewall?

 

T

tempdoug

PATRON

nd

• Oct 9, 2019

• #2

1 line from gauge to engine, grommet in firewall. i think i used the smallest aeroquip 303 with the A N ends. no issues or losening so far.

 

Last edited: Oct 9, 2019

CamTom12

Registered User

Huntsville, AL

• Oct 9, 2019

• #3

I have a bulkhead fitting in the oil line from the engine to the gauge

 

mvivion

SPONSOR

Bozeman,MT

• Oct 9, 2019

• #4

Do NOT use a single straight hard line. It will break. Use flex line.

MTV

 

wireweinie

FOUNDER

Palmer, AK

• Oct 9, 2019

• #5

What Mike said.

The original set up was a flex line off the engine to a hard line to the gauge. Of course the best way is a flex line from the engine to a pressure sensor. Then wires from the sensor to the gauge.

Web

 

skywagon8a

MEMBER

SE Mass MA6

• Oct 10, 2019

• #6

wireweinie said:

What Mike said.

The original set up was a flex line off the engine to a hard line to the gauge. Of course the best way is a flex line from the engine to a pressure sensor. Then wires from the sensor to the gauge.

Web

Click to expand...

That is the best way IF you are going to depend on electricity for your oil pressure reading. Oil pressure being the most critical instrument in the airplane, it is safer not to use two systems to operate it. Use direct reading oil pressure for safety. Always use a flexible connection between a component (engine) which moves and a component (airframe) which does not.

 

Steve Pierce

BENEFACTOR

Graham, TX

• Oct 10, 2019

• #7

Univair sells the Piper flex line that attaches to the engine that also acts as a restrictor and was originally attached to copper tubing to the gauge going through a grommet at the firewall.

 

wireweinie

FOUNDER

Palmer, AK

• Oct 10, 2019

• #8

I've been changing them over to AN fittings and lines. I use the Maule restrictor fitting screwed into the pressure port on the accessory case.

Web

 

B

bob turner

Registered User

• Oct 10, 2019

• #9

I have done both AN fittings and a single #3 Aeroquip, and the original Piper style using auto brake line stuff. From what information I have, the auto parts are good to 5000psi; the Aeroquip to 600. Difference in cost is stunning.

The original restrictor was simply a brazed and drilled pipe to inverted flare fitting.

 

Steve Pierce

BENEFACTOR

Graham, TX

• Oct 11, 2019

• #10

Original oil pressure line pictured on a 1946 J3 that had been in a barn since 1950 unmolested. Looks like the same oil pressure line with restrictor fitting that is in the parts manual and every other tube and fabric Piper I have worked on. I have never seen:

The original restrictor was simply a brazed and drilled pipe to inverted flare fitting.

Click to expand...

 

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supercub

MEMBER

Let me check my GPS, gee how'd we ever navigate w

• Oct 11, 2019

• #11

WOW, since 1950 that's amazing. I once had owned a Cub that had been stored since the 60's, still had the original fabric on it. Had 1,000 hrs total time. At least it had been stored in a dry area, no rust. That poor girl above, definitely needs some TLC, but still what a find. Thanks for all the above info. I know Piper used the short flex line with hard tubing to the gauge, but I'm leaning towards flex hose and a firewall fitting. Thanks again.