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#1 |
Senior Member
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Location: Brownsburg, IN
Posts: 1,115
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Oil Pressure Line
I’m curious about the oil pressure line on the 72 Blazer that I am rebuilding. The oil line has a rubber casing around it, while my 71 K1500 oil line is just bare copper line. Both have a sbc 350. Are both correct for their year?
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1972 Blazer Highlander 1971 GMC K1500 SWB (sold) 2004 Corvette Z06 CE |
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#2 |
Senior Member
![]() Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,138
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Re: Oil Pressure Line
I have had a couple of Blazer’s and Jimmy’s with the rubber coating around the copper oil pressure line. I’ve also had a couple without it. Who knows what happened over the course of the last 50 years? But I do believe at least some came factory with the rubber hose covering the copper line?
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Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205 |
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#3 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,950
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Re: Oil Pressure Line
Oil pressure lines, iirc, are steel from the factory. Copper work hardens and gets brittle and cracks. I suspect that the cover is to stop corrosion and/or nicks. If I ever replace my oil pressure gauge tubing, it'll be with a wire. The truck has had one engine rebuild and still has the original line, as far as I know, though.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#4 | ||
The Older Generation
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Location: Montezuma, Iowa
Posts: 26,089
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Re: Oil Pressure Line
Quote:
This is not always true. The refrigeration copper tubing that I use for my oil lines does not work harden. It is specifically made for refrigeration applications where there is a lot of vibration and other movement.... Quote:
LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#5 | |
Senior Member
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Location: Brownsburg, IN
Posts: 1,115
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Re: Oil Pressure Line
Quote:
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1972 Blazer Highlander 1971 GMC K1500 SWB (sold) 2004 Corvette Z06 CE |
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#6 |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,703
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Re: Oil Pressure Line
LockDoc is correct this is known as annealing a heating/cooling process that gives copper ductility, annealing is also used in electrical wire manufacturing to make it flexible
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#7 |
Registered User
Join Date: Jan 2001
Location: Orem, Utah
Posts: 8,022
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Re: Oil Pressure Line
I don't recall any of mine having a rubber coating, but I can't say for sure that they didn't.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#8 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 26,089
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Re: Oil Pressure Line
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I have original steel lines with and without the rubber sleeve. Also, some lines were one piece and some were two piece with a union connector in the middle. It may have been dependent on which supplier supplied the oil lines for a certain assembly plant. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#9 |
Registered User
Join Date: Mar 2010
Location: Oregon
Posts: 190
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Re: Oil Pressure Line
Rubber around the oil pressure line is common on 1973 and later years... I do not know when it was introduced.
I do believe it serves as vibration dampener. In my experience, less engine noise is transferred into the interior of the vehicle when used. Bob |
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