Oil Pressure line
Thread Starter
Heel & Toe
Joined: Oct 2002
Posts: 22
Likes: 0
From: Bath Maine
Oil Pressure line
Hi All,
This may be one of those questions where the answer is obvious, but I must ask it anyway. Will air spaces in the oil line from the engine to the pressure gage effect the accuracy of the reading on the gage? I can see empty spaces in the clear plastic line between sections filled with oil. Must the plastic line be completley filled with oil to give an accurate reading, and if so, how do I go about purging the air from the line?
Suggestions welcome.
This may be one of those questions where the answer is obvious, but I must ask it anyway. Will air spaces in the oil line from the engine to the pressure gage effect the accuracy of the reading on the gage? I can see empty spaces in the clear plastic line between sections filled with oil. Must the plastic line be completley filled with oil to give an accurate reading, and if so, how do I go about purging the air from the line?
Suggestions welcome.
Burning Brakes
Joined: Oct 2002
Posts: 1,040
Likes: 109
Originally Posted by big_G
Pressure is pressure. It won't affect the gauge accuracy. The line will fill with oil evenually. 
the line does not fill up with oil untill you break the fitting at the gauge and bleed like a brake line.
as for the reading ???if you have air in your brake line the pedal will feel very soft ,or you will not have any brakes,so I must disagree with this quote(pressure is pressure)
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
Originally Posted by 1971corvette
the line does not fill up with oil untill you break the fitting at the gauge and bleed like a brake line.
as for the reading ???if you have air in your brake line the pedal will feel very soft ,or you will not have any brakes,so I must disagree with this quote(pressure is pressure)
as for the reading ???if you have air in your brake line the pedal will feel very soft ,or you will not have any brakes,so I must disagree with this quote(pressure is pressure)
Le Mans Master
Joined: Nov 2004
Posts: 6,434
Likes: 0
St. Jude Donor '07
Originally Posted by big_G
With brake systems, your pressure is limited by the master cylinder stroke. On an engine, the oil pump will exert a constant pressure on the oil in the line, regardless of the air. You can only have a pressure drop to the gauge if there is a leak or restriction in the line.
Pro
Joined: Sep 2002
Posts: 541
Likes: 5
From: Epping NH
more of an observation,
but when you shut the car down, the oil pressure bleeds off, and since the oil pressure line is not a sealed system (no one way valves to keep oil in the line) some of the oil will drain back into the block over time, even if you prime the line. Right? So, air is bound to enter the line.
BTW, I just replaced my OP line. After pulling the block, the line was so fragile that it cracked and broke off in my hand when I tried to secure it out of the way. While I was at it, I decided to have my clock fixed (clockworks) and, I cleaned all electrical contacts on the gauges, and replaced all of the bulbs in my instrument cluster.
Ready for the engine now.
BTW, I just replaced my OP line. After pulling the block, the line was so fragile that it cracked and broke off in my hand when I tried to secure it out of the way. While I was at it, I decided to have my clock fixed (clockworks) and, I cleaned all electrical contacts on the gauges, and replaced all of the bulbs in my instrument cluster.
Ready for the engine now.
Racer
Joined: May 2001
Posts: 394
Likes: 0
From: Jackson, MS USA
You can compress air, but not oil (at least not much). However, I think that the effect is negliable. Burgundy 69, One thing you may want to consider to keep your pressure line from becoming a radio oiler, is to put a safety line around it. Just go to the Home Depot, and get on size larger line. SLide it on, and zip tie it, or safety wire it to the fittings, over the top of the pressure line.
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