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Old 01-07-2010, 12:06 PM   #1 (permalink)
Mike782
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Oil Pressure Switch Replacement

Where is the oil pressure switch for the gauge located? My gauge reads erratically at times... almost always very high and it jumps around. I am going to order an AC Delco one for it, but want to know where it is and how/what is involved in replacing it. Thanks
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Old 01-07-2010, 12:25 PM   #2 (permalink)
chevyinlinesix
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Here is a link that gives you all kinds of information about the OPS, I found it in the FAQs sticky. On your engine, it may not be in that exact location, but rather it will be between the fuel filter and the intake runner, down it the valley of the engine.
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Old 01-07-2010, 02:02 PM   #3 (permalink)
Mike782
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If it is in the "Valley" under the intake... how hard is that to replace?
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Old 01-07-2010, 02:18 PM   #4 (permalink)
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Depending on the year of the block, it is infront of or behind the fuel filter manager.

If it is infront of the fuel filter manager, it will be slightly underneath the intake and most likely would need a "custom bend - blue torch" wrench or a crowsfoot. I have a crows foot from snap-on and it works perfect for this job lol. The size for the OPS is 1-1/16" iirc.

If the OPS is behind the fuel filter manager you should be able to just use a regular OPS socket and R&R.

I remember the first time replacing my OPS... lol... It was about 98*F out with ~80%+ humidity... talk about a job lol. The job of replacing it isn't that bad though, as long as you have the right tools.
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Old 01-07-2010, 04:53 PM   #5 (permalink)
Mike782
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Looks like it is behind the fuel filter in the valley between the intake... yikes!
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Old 01-07-2010, 05:15 PM   #6 (permalink)
jjw565
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after I finally got mine out of there I extended it up by a couple of inches with a piece of pipe so I can get a wrench on it easier next time, also made it easier to put the new one back in. Its a bit of a pain because it takes such a large wrench but there is no room to swing it
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Old 02-20-2010, 08:50 PM   #7 (permalink)
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Quote:
Originally Posted by jjw565 View Post
after I finally got mine out of there I extended it up by a couple of inches with a piece of pipe so I can get a wrench on it easier next time, also made it easier to put the new one back in. Its a bit of a pain because it takes such a large wrench but there is no room to swing it
Any pics of this? How long a piece?

I did mine today with a deep socket 1 1/16" wrench. I could slide the socket on, then just get the drive of the wrench in enough to turn the socket. Worked great.

Anyone use dope on the threads? there was some on the OPS I took out, but mine seems to have sealed up fine.

And the truck runs a whole lot better with a working lift pump!
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