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Old 01-30-2014, 05:58 PM   #1
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Help!

Drive a 1997 jeep tj with the 2.5L. I went to autozone to get a new oil pressure sending unit and when i was installing it i noticed it was hard to make it thread. I ended up accidentally cross threading it. I think they gave me the wrong one. I put my old one on but its still leakig alotttt of oil when i drive it. What can i do to fix this?

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Old 01-30-2014, 06:05 PM   #2
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If you messed up the threads in the motor you will need to re-tap those threads.

I would cover the tap with grease to catch any metal that might get loose.

There is also a tool that just chases the threads. It looks like a tap but is made to straighten up the thread instead of cutting the threads.
Wouldn't hurt to change the oil and filter when you get done.

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Old 01-30-2014, 06:09 PM   #3
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If you messed up the threads in the motor you will need to re-tap those threads. I would cover the tap with grease to catch any metal that might get loose. There is also a tool that just chases the threads. It looks like a tap but is made to straighten up the thread instead of cutting the threads. Wouldn't hurt to change the oil and filter when you get done.
Would a tap and die rental set from autozone be able to help me fix my problem?
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Old 01-30-2014, 06:21 PM   #4
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If they have the proper size tap.

Make sure you go in straight and slow. Small turns and the back up and then another small turn and back until you get them back in shape.

If yours is a pipe thread make sure you don't go to deep with the tap or you could open the hole up to much. Work slow and careful.
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Old 01-30-2014, 06:29 PM   #5
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Could i just put pipe tape around the sending unit to seal it? Or pipe thread sealent?
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Old 01-30-2014, 06:54 PM   #6
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Is an oil pressure sending unit critical to have? Like if i put in my old one in that reads zero will it effect my engine?
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Old 01-30-2014, 07:04 PM   #7
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Weather or not you want a readable gauge running engine with a hole where sender should be sprays out oil and makes oil pressure to low to prevent major engine damage just a few minutes of running engine with open oil gauge port can do major engine damage

You gotta fix it but since we don't know how much damage you did cannot say how to repair

If you tend to cross thread things a older vehicle and doing work yourself may not be a good idea

I would attempt to find a brass fitting (tube)with male threads that match sending unit and same size female threads on other end

Screw it into Block hole using the thicker pink Teflon tape only on threads then screw new sender or a plug into other end

With brass softer than steel or cast iron you probably won't do any further damage with ham fisted cross threading

If that seals your are golden if not get some skilled help before you do more damage
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Old 01-30-2014, 07:09 PM   #8
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I liked Diggers advice. Another thing you may try is if your old unit you asked to put back in is not going to make the damage you already caused worse (like if it threads in easy) black RTV it back in place to seal it and let it cure overnight before you go driving around.
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Old 01-30-2014, 07:09 PM   #9
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Weather or not you want a readable gauge running engine with a hole where sender should be sprays out oil and makes oil pressure to low to prevent major engine damage just a few minutes of running engine with open oil gauge port can do major engine damage You gotta fix it but since we don't know how much damage you did cannot say how to repair If you tend to cross thread things a older vehicle and doing work yourself may not be a good idea I would attempt to find a brass fitting (tube)with male threads that match sending unit and same size female threads on other end Screw it into Block hole using the thicker pink Teflon tape only on threads then screw new sender or a plug into other end With brass softer than steel or cast iron you probably won't do any further damage with ham fisted cross threading If that seals your are golden if not get some skilled help before you do more damage
Who would sell the brass fittings?
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Old 01-30-2014, 07:13 PM   #10
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You could try some Teflon tape if you want. The worst thing that could happen is it might still leak.

If your gauge is reading zero pressure it will not hurt your engine if it is the sender that is causing the zero reading.

Now, if is not the sender causing the zero reading you could have serious problems that will harm your engine.

You need to get a good sender in the engine to know for sure. I would not drive it till I was sure it was just the sender that is causing the zero reading.
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Old 01-30-2014, 07:21 PM   #11
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I think i screwed up the threads bad because the oil sending unit just keeps on turning inside
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Old 01-30-2014, 07:22 PM   #12
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Home Depot lowes any good hardware store as I think it is a standard pipe thread but bring your sending unit to match it up

Of not a standard 1/8 pipe thread try a speed shop or summitracing
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Old 01-30-2014, 07:22 PM   #13
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It was reading fine before i replaced the sender i replaced it because it was leaking
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Old 01-30-2014, 07:54 PM   #14
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I've only threaded things I made the holes for like the things to stow my swaybar disconnects so forgive this if it's ignorant. If this thing is free spinning by hand in the hole is there enough metal left to re thread it? He didn't say by hand just for example. He said it's turning in there sounds pretty free.
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Old 01-30-2014, 08:03 PM   #15
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Depends may just have turned all threads of male sender thread or may have stripped all threads from hole no idea

If really gone in block he needs someone with shill to thread next size up and carefully thread in a brass adapter but he is approaching the point of no return so reluctant to encourage him to forge ahead wits a cutting tool like a bit or tap as may go from bad to worse
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Old 01-30-2014, 08:06 PM   #16
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Cool thanks. Learning a lot today.
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Old 01-30-2014, 08:19 PM   #17
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Just bought a brass fitting ill see if it works
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Old 01-30-2014, 08:28 PM   #18
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If it's just turning in the hole then tapping/chasing it is not going to do any good. Doing a secondary fitting as suggested above sounds plausible. If it was me for a permanent fix I would probably try a helicoil kit. Find out the exact thread size/type (it's likely that you are dealing with a tapered thread). I do want to mention that I have never personally used a helicoil in this particular application-just throwing the idea out there as a possibility.
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Old 01-30-2014, 09:29 PM   #19
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Well i just hand tighten the brass fitting as good as i could and then put some red rtv around it for good measure and then put the oil pressure sensor into the fitting. I will see if it worked or not tommorrow!
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Old 01-30-2014, 09:34 PM   #20
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Now that looks custom! Hope it works brother!
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Old 01-30-2014, 09:34 PM   #21
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Also my block had a brass fitting on it already and thats what i stripped... Is that stock? I screwed on the brass fitting i bought into the brass fitting that was already screwed onto the block if that makes sense ahha. Thanks!
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Old 01-30-2014, 09:44 PM   #22
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If it has a removable brass fitting you are golden just remove and replace the fitting with wrench or if broken THE PROPER SIZE easy out
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Old 01-30-2014, 09:46 PM   #23
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If it has a removable brass fitting you are golden just remove and replace the fitting with wrench or if broken THE PROPER SIZE easy out
Yeah thats what i was thinking. I wonder why it has one on it though and what size fitting is like stock its 1/8 so it might be 1/4 if the previous owner already stripped it before
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Old 01-30-2014, 10:05 PM   #24
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Go to the online site of Morris 4x4 knowledge base view or download jeep factory parts for your year wrangler and find the part number
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Old 01-30-2014, 10:21 PM   #25
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Read here for someone else who had same prob with easy hardware store fix

http://www.jeepforum.com/forum/f12/o...-unit-1293803/
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Old 01-30-2014, 10:41 PM   #26
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Read here for someone else who had same prob with easy hardware store fix http://www.jeepforum.com/forum/f12/o...-unit-1293803/
Any idea on the thread pattern of the 90 degree fitting?
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Old 01-30-2014, 11:40 PM   #27
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Just did alot of researching i believe it is 1/4 npt male to 1/8 npt female for the brass adapter on the block. I will go get a new one tomm and install it thanks everyone!
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Old 01-31-2014, 08:05 AM   #28
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Just did alot of researching i believe it is 1/4 npt male to 1/8 npt female for the brass adapter on the block. I will go get a new one tomm and install it thanks everyone!
What do they mean by tapered fitting?
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Old 01-31-2014, 08:12 AM   #29
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Would this work?
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Old 01-31-2014, 11:17 AM   #30
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Well my fix i did last night held and its not leaking oil out at all i bought a new pipe fitting for going into the block but i dont knownif i should install it or leave it how it is?
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