01-04-2020 | #11 |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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Re: OE Style Oil Cooler Lines?
You will then need an Oil Filter Adapter Gasket and a bit of Permatex Gasket Sealant
You still have the issues of corroded and "locktited" Fittings to remove and I say again and again.......use a little heat on the Aluminum Housing around the fittings (one fitting at a time)........Propane torch or Acetylene torch will work You do NOT want to "bugger up" the flats on the fittings I use a bit of Permatex Gasket Sealant on the fitting pipe threads also when installing the fittings (Just tight enough to not leak....Do NOT OVERDO tightening the pipe fittings Jerry knows why the small print regarding Permatex
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 01-04-2020 at 11:07 PM. |
01-09-2020 | #12 | |
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: OE Style Oil Cooler Lines?
Quote:
Did I read the above correctly,...the AN-12 fittings on the engine were "adapted down" to AN-10 for the hoses? If so, why would you want to restrict oil flow like that? Also, I take it that you still cannot break the fittings loose. If it were me, as a last resort and after I remove anything that burns which is in close proximity of those two fittings (that includes grease/dirt on the engine) I'd try heating those fittings with a propane torch fitted with a nozzle that allows you to keep the flame pretty narrow. I'd also go looking on the Internet for a big flare nut wrench or a big flare-nut crowsfoot wrench in the AN-12 size. Another "hail mary" idea would be to remove the oil filter/cooler connection adapter from the engine then try and remove the fitting/hose combination from that adapter.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 Last edited by Hib Halverson; 01-09-2020 at 06:05 PM. |
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01-09-2020 | #13 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,155
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Re: OE Style Oil Cooler Lines?
Where do the OE line typically leak from? I still have OE lines on my car.. I don't think they are leaking
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
01-09-2020 | #14 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,698
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Re: OE Style Oil Cooler Lines?
Mine leaking, sweating from the crimp area.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
01-10-2020 | #15 | |
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,391
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Re: OE Style Oil Cooler Lines?
Quote:
Original AN fittings @ Oil Filter Adapter are 1" MNPT x Male AN-12 Replacement fittings furnished with Jerrys Gaskets Oil Cooler Hose Kit are 1"MNPT x Male AN-10. Hoses, fittings & adapter are all the same flow capacity at the original hoses & fittings.
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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01-10-2020 | #16 | |
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,391
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Re: OE Style Oil Cooler Lines?
Quote:
Maybe it's our generation, but I prefer the non-hardening type Permatex over silicone. On a much more limited basis than you!!
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 01-10-2020 at 11:36 AM. |
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01-11-2020 | #17 |
Join Date: May 2018
Location: Virginia
Posts: 79
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Re: OE Style Oil Cooler Lines?
Got the lines on the car today. I ended up using a set of AN-12 female to AN-10 male adaptors on the factory fittings. Although these adaptors had O-rings, I used Permatex high temp tread sealant. I reused the lines from the Jerry's Gaskets kit to save $$$ and because the fittings on the oil cooler side were known good quality. I cut about 3" from the lower line and 2" from the upper and installed 45 degree Russell fittings. The lines were rinsed with water & blown dry before installation.
I'm very happy with the results. No leaks after letting the car idle for 5 minutes, followed by a 15 minute test drive. Last edited by Black Red '90; 01-11-2020 at 07:52 PM. |
01-15-2020 | #18 |
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Re: OE Style Oil Cooler Lines?
There is a "story" about the oil lines.
Back when the engine was in deveopment at Lotus, the oil lines were designed using some custom made hose ordered-up by Lotus. The hose ID was close to the ID for AN-10. The engine went to production with that hose set. Problem was: that hose set had some kind of design defect that eventually had the hoses leaking where the fittings were crimped onto the hose material and also some of those old hoses would "weep" oil. After a year or so of production and replacing a poop-load of those hoses under warranty, GM had to have more hose sets made. GM decided to change the hose set to solve the leak problem and sourced the hose domestically. Problem was, the ID of the original Lotus-designed hoses was not a standard size available in the U.S. The cheap bastards at GM picked a hose size smaller than the original design. Obviously, smaller diameter means more restriction to oil flow. I remember several years after I bought Barney, my hoses started leaking. I pulled them off, went down to the Chevy store and said, "I need a set of these." They didn't have them in stock (obviously) so I ordered a set. A week later they showed up and the first thing I noted was the ID was smaller. "No way, send them back, dude. I'll make a set of AN lines". Measuring the ID of the old hoses, I found them right about AN-10. Back then I had an Aeroquip sponsorship so I ordered enough raw materials to make a set of lines. I started with two AN-10 bulkhead fittings and had my cylinder head guy weld them onto the 90° curved section of aluminum tube coming out of the plate that bolts to the cooler. After that, it was a simple matter of making up the lines, setting them in place and tightening the fittings on the engine and tightening the bolt on the cooler. Those hoses lasted for 15 years and were on the car when I sold it. Wherever Barney is now, they are probably still on that engine.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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