Author Topic: oil pressure line  (Read 7480 times)

Ron C.

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oil pressure line
« on: May 11, 2007, 09:21:28 PM »
was the oil pressure line clear plastic or black? I found out that a grommet is on the firewall and not a fitting,so I need to replace the line and add the grommet.
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1968RSZ28

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Re: oil pressure line
« Reply #1 on: May 11, 2007, 10:14:03 PM »
Black

sd1968z28

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Re: oil pressure line
« Reply #2 on: May 11, 2007, 10:41:18 PM »
black cheese plastic, do your self a favor and bend a copper one and paint it black no one will know and it will no go bad.  the after market line is not so good!

GaryL

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Re: oil pressure line
« Reply #3 on: May 11, 2007, 10:55:26 PM »
was the oil pressure line clear plastic or black? I found out that a grommet is on the firewall and not a fitting,so I need to replace the line and add the grommet.

I don't thnink the grommet is available. I had to use a 1" x say 5/16" with a 1/8" hole and glue the small one inside the large one. Could not find a 1" with a 1/8" hole.
Gary

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zdld17

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Re: oil pressure line
« Reply #4 on: May 11, 2007, 11:01:55 PM »
Better yet,  do use the 1/8" copper tubing as mentioned above,  with compression fittings,  use a long enuff piece of tubing and make a one or two double loop  at the fire wall before going into interior to gauge and get enuff black  1/8 or 3/32 rubber vacumn hose to slip over the entire length of tubing to the grommet.     The loop will absorbe vibration that could cause a break in copper and rubber hose will protect and color tubing black.  Make sense?   Works for me and I didn't stay at the Holiday Inn.

As for he rubber grommet issue,  the Trifive chevy applications have such a grommet for wiper motor cable or you can go to Lowes and look thru their rubber or plastic blank plugs and fit as needed.   
« Last Edit: May 11, 2007, 11:04:27 PM by zdld17 »
Don Dabbs

68Zproject

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Re: oil pressure line
« Reply #5 on: May 11, 2007, 11:39:14 PM »
My 68 AIM shows the hole to be 1/2" dia. I just went to a hardware store and found a grommet to fit.
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GaryL

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Re: oil pressure line
« Reply #6 on: May 12, 2007, 04:09:35 AM »
My 68 AIM shows the hole to be 1/2" dia. I just went to a hardware store and found a grommet to fit.
You are right. The hole is actually 1/2". I could not find a 1/2"x1/8" grommet.
Gary

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JohnZ

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Re: oil pressure line
« Reply #7 on: May 12, 2007, 02:33:44 PM »
Copper tubing isn't a great idea for an oil pressure line - copper work-hardens with movement and vibration and fractures/cracks. Metal oil pressure lines on GM cars after about 1960 were copper-plated steel or plain steel, then changed to nylon.
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68Zproject

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Re: oil pressure line
« Reply #8 on: May 12, 2007, 03:29:05 PM »
I guess everyone's stores are different, but I went to a True Value and they have the drawers with the parts in there.  Must have had 50 different sizes.  I haven't had much luck with Lowes or Home Depot type places. I could even throw one in an envelope if you like.
« Last Edit: May 12, 2007, 08:57:39 PM by 68Zproject »
68Z28

Ron C.

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Re: oil pressure line
« Reply #9 on: May 12, 2007, 10:49:46 PM »
Thanks everyone, I found a black plastic oil line kit and it is in and looks fine. I just didnt know if they used clear or black line. ;D
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zdld17

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Re: oil pressure line
« Reply #10 on: May 12, 2007, 11:17:50 PM »
Well, to each his own,, I would rather have a copper line instead of plasic, in event of a small fire in that area. 
Don Dabbs

Ron C.

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Re: oil pressure line
« Reply #11 on: May 12, 2007, 11:31:41 PM »
here is a pic of the oil line i did.
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KurtS

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Re: oil pressure line
« Reply #12 on: May 16, 2007, 04:17:17 AM »
Let's see.
One of our test vehicles burnt to the ground with a copper line for a fuel pressure guage that work hardened and broke. The fire got hot enough that it melted the wheels off the car....

And I had a test vehicle that I was driving and the oil pressure line work hardened and broke. It poured out a lot of smoke, but I got lucky and it didn't catch fire and I didn't ruin the motor (special cam / lifter test vehicle no less).

A copper line is a bad idea.....
Kurt S
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RamAirDave

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Re: oil pressure line
« Reply #13 on: May 16, 2007, 05:12:36 AM »
Also to note, the run-of-the-mill compression fitting on the black plastic line wont seal the factory style sending unit and gauge.

Just for reference, this is the firewall grommet, which I don't believe is repo'd yet:







Within the last week, I came across a grommet that "appeared" to be the same on another 69, but with a different use (warning light car).  I really cant think of where it was right now, and I didnt check to see if it is the same dimensions or not.
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68Zproject

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Re: oil pressure line
« Reply #14 on: May 16, 2007, 05:39:42 AM »
RAD, does the 2nd picture face out?  Is that what you would see looking at the firewall, or the cone shaped end?
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zdld17

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Re: oil pressure line
« Reply #15 on: May 16, 2007, 12:15:44 PM »
OK, you have convinced me even though copper line was used from the factory on this.   As for fuel line use, that is a no, no.   There are fuel isolators and stainless braided line for this.   :-[
Don Dabbs

JohnZ

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Re: oil pressure line
« Reply #16 on: May 16, 2007, 02:40:38 PM »
RAD, does the 2nd picture face out?  Is that what you would see looking at the firewall, or the cone shaped end?

The large end is on the engine compartment side, and the small end is inside the car.
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JohnZ

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Re: oil pressure line
« Reply #17 on: May 16, 2007, 02:43:58 PM »
OK, you have convinced me even though copper line was used from the factory on this.

Nope, the OEM line was never copper - they were steel or copper-plated steel; any copper oil pressure line you find was replaced at some point.
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zdld17

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Re: oil pressure line
« Reply #18 on: May 16, 2007, 03:02:34 PM »
OK, you have convinced me even though copper line was used from the factory on this.

Nope, the OEM line was never copper - they were steel or copper-plated steel; any copper oil pressure line you find was replaced at some point.

OK, prolly copper plated. 
Don Dabbs

RamAirDave

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Re: oil pressure line
« Reply #19 on: May 17, 2007, 02:22:35 AM »
This is the one I came across the other day and thought "that looks a lot like the op firewall grommet."  Close, but definitely not the same and a little small.  I suppose it could be made to work considering there are a lot more of these out there than the correct ones.





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Jerry@CHP

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Re: oil pressure line
« Reply #20 on: May 17, 2007, 12:32:40 PM »
From an originality stand point, you have to go with a line that looks like the factory original if you're doing a concours resto.  From a safety perspective, steel braded line is what is used for most racing applications today.  NHRA will not allow the plastic lines and they don't like the copper lines either.  I have a copper oil line in my race car and it's broke several times.......much of this relating to what John Z is saying in this thread.  I just kept patching it up over the yerars.  I will install braded lines in the new race car that I am building this year.  Once that is done, there will be no issues to worry about.

That grommet pictured above looks just like the one used in the distributor housing for the wire lead.

Jerry

RamAirDave

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Re: oil pressure line
« Reply #21 on: May 17, 2007, 11:36:40 PM »
That grommet pictured above looks just like the one used in the distributor housing for the wire lead.

Bingo!
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