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#2212698 - 03/26/11 02:04 PM How long does it take to work
Da Game Offline


Registered: 12/27/05
Posts: 577
Loc: Chicago
Okay... I've just came from underneath my car trying to replace the rear Oxygen sensor. These bad boys are in there. The sensors are the original ones from 1997 & they've seen plenty of Chicago weather. I don't want to use a torch so the mechanic says $50.00 for him to bust them loose.

I'm currently using Kroil penetrating oil, since about 11 am cdt, now it's three(3)hours later and still will no move. Quick questons.

1) How long does this stuff need to be effective?
2) Should I keep spraying them down every 2hrs or so?

Forgot to mention that the O2 sensor are between the cats, so they see winters and all kinds of weather directly on them.

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#2212702 - 03/26/11 02:08 PM Re: How long does it take to work [Re: Da Game]
190E26FTW Offline


Registered: 01/26/11
Posts: 283
Loc: Los Angeles, CA
I usually hear of Kroil being used on firearms. Have you tried WD40? That stuff works great at loosening up rusted exhaust manifold bolts for me.

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#2212713 - 03/26/11 02:25 PM Re: How long does it take to work [Re: Da Game]
simple_gifts Offline


Registered: 07/26/04
Posts: 11399
Loc: Middlesex County CT
I would now start the car and warm up the exhaust to "a bit hot to the touch" ; that has worked for me.
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#2212721 - 03/26/11 02:31 PM Re: How long does it take to work [Re: Da Game]
bullwinkle Offline


Registered: 10/09/04
Posts: 6481
Loc: Cincinnati, OH, USA
PB Blaster if you can get it, soak it, let it sit overnight.
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#2212730 - 03/26/11 02:39 PM Re: How long does it take to work [Re: Da Game]
goodtimes Offline


Registered: 12/08/10
Posts: 1971
Loc: california
Extension pipes/bars? Seems obvious, but has to move, the mech can do it so can you. Some feet of extension will move it, plus the other ideas.

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#2212744 - 03/26/11 03:01 PM Re: How long does it take to work [Re: bullwinkle]
Da Game Offline


Registered: 12/27/05
Posts: 577
Loc: Chicago
Originally Posted By: bullwinkle
PB Blaster if you can get it, soak it, let it sit overnight.



This Silk-Kroil is better from what I hear. I've tried the Breaker Bar, but the O2 sensor socket won't seat properly when I apply strength. I don't have the same leverage being on the garage floor. I'll spray again in a few minutes let sit then start it.

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#2212800 - 03/26/11 03:45 PM Re: How long does it take to work [Re: Da Game]
Mr Nice Offline


Registered: 09/12/04
Posts: 18405
Loc: Orlando, FL
Did you try removing them after a long drive ?

I notice they are come out easier when the exhaust is up to operating temp.
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#2212862 - 03/26/11 04:22 PM Re: How long does it take to work [Re: Mr Nice]
Da Game Offline


Registered: 12/27/05
Posts: 577
Loc: Chicago
Originally Posted By: LT4 Vette
Did you try removing them after a long drive ?

I notice they are come out easier when the exhaust is up to operating temp.



No, I just let the car warm up to operating temps (about 20 min), shut it down and sprayed again. Still no budge.

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#2212904 - 03/26/11 05:11 PM Re: How long does it take to work [Re: Da Game]
190E26FTW Offline


Registered: 01/26/11
Posts: 283
Loc: Los Angeles, CA
Warm it up and use a very long breaker bar. Some pipes or even PVC pipes would help to extend your wrench. Or an air gun.

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#2212935 - 03/26/11 05:38 PM Re: How long does it take to work [Re: Da Game]
tom slick Offline


Registered: 05/26/03
Posts: 9122
Loc: Central Coast, Calif.
Just gotta let it soak then use lots of leverage.

Kroil is as good as anything else. I was introduced to kroil for busting loose stainless steel fasteners in jet engine turbines where it made removal much easier.
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#2212996 - 03/26/11 06:31 PM Re: How long does it take to work [Re: tom slick]
Da Game Offline


Registered: 12/27/05
Posts: 577
Loc: Chicago
Originally Posted By: tom slick
Just gotta let it soak then use lots of leverage.

Kroil is as good as anything else. I was introduced to kroil for busting loose stainless steel fasteners in jet engine turbines where it made removal much easier.

Thats just what I'm worried about. I talked to the parts guy at Infiniti and was told if I stripped the seating area where the sensor mounts, it alot of cash to replace. I'll keep spraying it down over the weekend and see what happens Sunday eve. I was thinking on buying a REASONABLE PRICE electric imoact gun (250LBS) to have on hand. I'm by no means a pro just trying to keep cost down.

Can you guys recommend a good one or is that another thread?

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#2213193 - 03/26/11 10:46 PM Re: How long does it take to work [Re: Da Game]
kasedian Offline


Registered: 03/08/11
Posts: 411
Loc: Kansas
Why dont you want to use a torch? I assume its bad anyways. I had to replace a catalytic converter on my Blazer, and had to remove a sensor that was working properly. I soaked it in PB Blaster, and after awhile put the heat to the exhause pipe, around the sensor. Not directly on the sensor. Still blew a nut trying to turn it out but, it came out. Put it in the new CC, and everything seems fine. Just my experience.
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#2213864 - 03/27/11 04:35 PM Re: How long does it take to work [Re: Da Game]
Vikas Offline


Registered: 07/22/05
Posts: 10978
Loc: NorthEast
On all my cars, the rear O2 sensor came off with not much struggle. They all had anywhere between 70K to 150K of New England weather on them. The important thing is to make sure they are hot and you use the O2 sensor socket and whack it a little. Don't try open end wrench on it.

- Vikas

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#2213889 - 03/27/11 04:58 PM Re: How long does it take to work [Re: Da Game]
RnR Offline


Registered: 12/16/05
Posts: 563
Loc: Michigan, Thumb's Up!
My sure-to-be-ridiculed approach would be stick with the Kroil and find some way to introduce some moderate but repetitive vibration to the sensor area. Use a tap-tap-tap tempo to allow the Kroil to creep in. JMO.
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#2214329 - 03/28/11 01:15 AM Re: How long does it take to work [Re: Da Game]
Da Game Offline


Registered: 12/27/05
Posts: 577
Loc: Chicago
Thanks alot guys. I'm taking her in this mornimg for $50.00 both sides. The manual said they were torqued to 40lbs so I wont gamble.

Also the O2 sensor I ordered the price just went up $5 bucks. I wonder what other parts are on the rise. I went to AutoZone for their parts rental

Thank you all, VERY VERY VERY much for all the advice. I'll be more prepared the next time. Oh, any recommendation for a Electric Impact Wrench. They seem to be disappearing?

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