Oil pressure line through firewall - Team Camaro Tech
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post #1 of 9 (permalink) Old Apr 2nd, 08, 05:52 PM Thread Starter
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Duke
 
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Smile Oil pressure line through firewall

Help- I posted this question some time back in the body shop forum, but could not get the answer I need. I need dimensions to locate the proper firewall hole location for the oil pressure line on a 1969 firewall. There is supposed to be an existing dimple according to the AIM, but I can't find one. If you have the time, please tape a few measurements for me, such as:
distance right or left of the midline (or other obvious landmark) and distance down from the crown of the firewall. Thanks!!

1969 RS Convert ON THE ROAD AT LAST!
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post #2 of 9 (permalink) Old Apr 2nd, 08, 07:23 PM
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Don
 
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Re: Oil pressure line through firewall

I just got thru with this but did not use the copper or plastic line covered with small vacumn hose for protection. I have never had a copper or plastic break in the 50+ years of rodding but I have heard of some as the newer copper tubing is just too cheap and thin.
I did use the hole thru the firewall grommet left of the accel pedal. For safety reasons, I just routed thru a newly made hole, above the speedometer cable (Z car here), I used a stainless wrapped hose with inverted flare end, installed a grommet around the hose then thru the fire wall hole I made, about 5/8" hole. I then used inverted flare fittings on both block and gauge. Now I know I will never pop a hot oil pressure line , in the interior, as long as I live.
As for the indention in the firewall, it was about at an 11 0'clock position, looking at the firewall from under the hood. Hope this helps.

You could also use the 1/8" compression BULKHEAD type fitting where the line does not pass thru the fire wall. I have seen this done very neatly. There are some photos on this site if you do a search on the subject.
Also notice in the AIM manual, page 30, show the interior cowl pad + where the oil line was suppose to go thru. No other markings that I can see. Also check page 9, you should see something that will give you some ideas. Hole #3 for the U17 option may be what you are looking for.

Don
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Last edited by zdld17; Apr 2nd, 08 at 07:43 PM.
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post #3 of 9 (permalink) Old Apr 10th, 08, 04:12 PM Thread Starter
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Duke
 
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Question Re: Oil pressure line through firewall

Anybody able to provide the dimensions to locate the proper hole in the firewall for the oil prerssure line?

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post #4 of 9 (permalink) Old Apr 10th, 08, 05:15 PM
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Ron
 
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Re: Oil pressure line through firewall

I use a Mechanical Oil Pressure gauge and would not have it any other way. I use it more then either the Tach or Speedo. I would never trust nylon, copper or steel lines. Use high grade high pressure hydraulic hose. It does not necessarily have to be encased but you must use a Rubber Grommet where it passes through the firewall. The size and location of the hole in the firewall is relevant to the size of the hose and the path from where you tap the engine block to where you mount the gauge.

I have used a Brass Fitting mounted on and through the firewall to which the hydraulic hose attaches in the engine bay and then run a nylon hose to the gauge mounted in the dash with success. Remember to loop both hoses to eliminate stress caused by flex.

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post #5 of 9 (permalink) Old Oct 19th, 12, 05:03 PM
David
 
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Re: Oil pressure line through firewall

To bad you didn't get a straight answer to your question. I to need the stock hole location.
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post #6 of 9 (permalink) Old Oct 19th, 12, 05:21 PM
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Re: Oil pressure line through firewall

Quote:
Originally Posted by sowersby View Post
To bad you didn't get a straight answer to your question. I to need the stock hole location.
See if this helps...

Kev
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post #7 of 9 (permalink) Old Oct 19th, 12, 06:24 PM
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Re: Oil pressure line through firewall

It isn't very easy to find in the AIM on page 9 as item 3 not to be confused with the radio grounding and capacitors in locations marked 2 on the firewall.

Feel your way to the left of the wiper housing to the second dimple you feel. It comes out dead on just above where the oil pressure plug on the block is.


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post #8 of 9 (permalink) Old Oct 19th, 12, 07:53 PM
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Jim
 
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Re: Oil pressure line through firewall

There should be a dimple in the firewall that was used by the factory to punch the hole for the grommet that was used with the oil pressure gauge. It's what I used for factory and aftermarket gauges both. It's pretty much directly behind the distributor...

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post #9 of 9 (permalink) Old Oct 20th, 12, 06:51 AM
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Re: Oil pressure line through firewall

Put the hole where it will be most convenient for you. Really not that critical.
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