Oil Pressure Switch Problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mike_82_Shortbox · 12-12-2020, 07:41 PM

Hey guys, long time since I posted here, but I have a problem. I can't really find my oil pressure switch, and I think it's why my choke/oil pressure light is on.

It's not at the rear top of the block like a lot of sbc's, but it looks like it is on a port or fitting that is attached to the oil filter fitting. Does that make any sense?

I just had the transmission rebuilt, so that's why it's nice and clean, and that's when the light came on. I'm trying to determine if they pinched, broke, or disconnected a wire or if this is just coincidental, but I can't test it if I can't locate it. Is that thing buried in grease with wires coming out if it, it?

Thanks.

**Steeveedee** · 12-12-2020, 07:51 PM

Look at the parting line between the engine and trans and see if there is a wire pinched. Did you get it back from the transmission shop with the light on, and is it on steady? Spray some cleaner on there to get the guck off. It's hard to tell what is under there.

**The Rocknrod** · 12-13-2020, 07:36 AM

Should be in that clump of oil grease and dirt in your pic. bout 7 oclock down and to the left of the threaded hole I think.

Dead Parrot · 12-13-2020, 08:25 AM

Yes, it makes sense. Many blocks have a second port in that location. Most times it is plugged and forgotten as the normal location on top is used. Spray that lump with some degreaser, wait a bit and spray with hose and I think you will find your oil pressure sender.

Mike_82_Shortbox · 12-29-2020, 03:34 AM

Thanks guys, it's been too cold and rainy to work on it, but I think tomorrow is the day. I did take it to a self-serve car wash and cleaned that area off, so it's visible. It's in exactly the same location as that block belonging to The Rocknrod. What the heck block is that?

This seems a fairly simple circuit, but I'll be damned if I can find it on the schematics...

I'll do my checks, and post results. Thanks again!

Andy4639 · 01-01-2021, 11:18 PM

What year truck are you looking for? Your on the 67/72 pages. Your avatar is for a 82? I assume that is what your asking about. The 67/72 all where hard lined.
They are both the same I think.

Mike_82_Shortbox · 01-04-2021, 04:34 PM

Well, crap. I accidentally posted to the wrong year forum. My truck is actually as pictured, an '82. Thanks for all your replies. I haven't changed the OP Switch yet, but today might be the day. It looks like I have a 3-wire switch, while this schematic says that circuit is for V-6 only. I wish I could figure out how the actual dash light fits into that circuit...lol.

**LockDoc** · 01-04-2021, 07:09 PM

Quote:

Originally Posted by Mike_82_Shortbox

Well, crap. I accidentally posted to the wrong year forum. My truck is actually as pictured, an '82. Thanks for all your replies. I haven't changed the OP Switch yet, but today might be the day. It looks like I have a 3-wire switch, while this schematic says that circuit is for V-6 only. I wish I could figure out how the actual dash light fits into that circuit...lol.

Not a big deal. This is after all, General discussion, not a year specific forum....

I could move it but I think it's doing OK so I will leave it.

LockDoc

12-12-2020, 07:41 PM	#1
Mike_82_Shortbox Registered User Join Date: Jan 2012 Location: Portland, OR Posts: 38	Oil Pressure Switch Problem Hey guys, long time since I posted here, but I have a problem. I can't really find my oil pressure switch, and I think it's why my choke/oil pressure light is on. It's not at the rear top of the block like a lot of sbc's, but it looks like it is on a port or fitting that is attached to the oil filter fitting. Does that make any sense? I just had the transmission rebuilt, so that's why it's nice and clean, and that's when the light came on. I'm trying to determine if they pinched, broke, or disconnected a wire or if this is just coincidental, but I can't test it if I can't locate it. Is that thing buried in grease with wires coming out if it, it? Thanks.

12-12-2020, 07:51 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,708	Re: Oil Pressure Switch Problem Look at the parting line between the engine and trans and see if there is a wire pinched. Did you get it back from the transmission shop with the light on, and is it on steady? Spray some cleaner on there to get the guck off. It's hard to tell what is under there. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

12-13-2020, 07:36 AM	#3
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Oil Pressure Switch Problem Should be in that clump of oil grease and dirt in your pic. bout 7 oclock down and to the left of the threaded hole I think. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

12-13-2020, 08:25 AM	#4
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,616	Re: Oil Pressure Switch Problem Yes, it makes sense. Many blocks have a second port in that location. Most times it is plugged and forgotten as the normal location on top is used. Spray that lump with some degreaser, wait a bit and spray with hose and I think you will find your oil pressure sender.

12-29-2020, 03:34 AM	#5
Mike_82_Shortbox Registered User Join Date: Jan 2012 Location: Portland, OR Posts: 38	Re: Oil Pressure Switch Problem Thanks guys, it's been too cold and rainy to work on it, but I think tomorrow is the day. I did take it to a self-serve car wash and cleaned that area off, so it's visible. It's in exactly the same location as that block belonging to The Rocknrod. What the heck block is that? This seems a fairly simple circuit, but I'll be damned if I can find it on the schematics... I'll do my checks, and post results. Thanks again!

01-01-2021, 11:18 PM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Oil Pressure Switch Problem What year truck are you looking for? Your on the 67/72 pages. Your avatar is for a 82? I assume that is what your asking about. The 67/72 all where hard lined. They are both the same I think. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

01-04-2021, 04:34 PM	#7
Mike_82_Shortbox Registered User Join Date: Jan 2012 Location: Portland, OR Posts: 38	Re: Oil Pressure Switch Problem Well, crap. I accidentally posted to the wrong year forum. My truck is actually as pictured, an '82. Thanks for all your replies. I haven't changed the OP Switch yet, but today might be the day. It looks like I have a 3-wire switch, while this schematic says that circuit is for V-6 only. I wish I could figure out how the actual dash light fits into that circuit...lol.



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