The sending unit is mounted on a 6-sided extension shaft about 3/4 inch in diameter. Been reading low oil pressure on odometer window and fluctuating gauges. Yes it could very well of happened that way. As far as the 'oil filter sandwich' goes - they sell an adapter from 1/8bspt to fit the 'sandwich' port, which is 1/8 NPT. 3) This was the biggie. I thought I had a rear main seal leak but turns out the oil pressure sending unit is cracked and faulty and leaking a lot of oil from my engine, causing it to run down the back the engine pan, making it easy to be mistaken for a rear main seal leak. You can also buy them directly from your car dealer. 2. The rubber seal inside leaks. Already changed the stepper motor. Then you can be sure if it's leaking or not. Connect the oil pressure sensor electrical connector. The wind would push it back and down. Dec 29, 2010. The whole purpose of the oil pressure sending unit is to illuminate the oil pressure light when there is a problem. Easy to change, just screw the old out and the new in. Here's a video of mine with the engine running and . Even if the old unit is dry, it can still be bad. The oil pump sucks oil from the oil pan and sends it under high pressure through . Just remember that the low pressure light does not iluminate until the oil pressure is low . The cost for an oil pressure sensor will depend entirely on your vehicle's specific product number for the part, but you can expect to pay anything . (3) fire causes hydraulic brake fluid to reach boiling point. In some cases, you may check the oil level to find out that everything is just okay. Model: Limited. It also could be that they double-gasketed the filter or made some other mistake and covered their asses by replacing the sending unit. First, perform a visual check of the switch. You'll need a ratchet and sending unit socket like the one below Oil pressure is around 60psi. My oil pressure usually read at around 40-45 at all times but now it reads around 80psi at idle and it pegs over to 90 while doing any sort of driving. Disconnect oil pressure sender connector (4). since oil is leaking Id naturally come to the conclusion that the item had to do with the engine oil. The cost of labor is between 73 and 93 while the cost of parts is between $48 and 67. The shop manual says to use a silicone sealant on the threads. Just a little more oomph and cured mine. Connect the negative battery cable. The leak is where that extension enters the block, not where the sending unit mounts to the extension. OP you should get a decent mechanic to check it out. Tighten the oil pressure sensor to 20 N.m (15 lb ft). 3. Oil pressure is 70 psi cold // 50 psi hot under load // 25-30 psi hot idle, PCV valve was pulled last night & checked with the old "suck on it" test and it's working. Install front splash shield. ive tried teflon tape, permatex black oil resistant thread sealer and new brass fitting for the unit to screw into but the damn thing is still leaking oil. But if the light comes on and you check your oil and find that everything is perfectly fine, then it's possible you're getting faulty signals from the oil pressure sending unit. im wondering if anyone knows if there is another kind of fitting that would screw into the block that would . Pull the connector and see if its wet. No change. The sending unit definitely needs to be replaced. 1987 - 1996 F150 - Leaky oil sending unit - I have a 1995 5.0 F150. Gauge has a big silver canister. If you see fresh oil on it (and it's not leaking from another component above it), it's toast. resulting in leaks and breakage. Lower vehicle. Jan 12, 2008. Apr 13, 2015. try Marvel Mystery Oil in fuel tank to help free sticking fuel gauge sending unit. As it starts to go bad on you, regardless of what . Removing the fuel pump might be necessary to get to it where the extension enters the block, not a problem. Install oil pressure sender. Oil pressure sending unit left front behind the alternator. Using a high volume Melling oil pump. It is located next to the oil pressure sending unit on the back of the block. Disconnect the engine oil pressure gauge sensor electrical connector. Before you change it make sure you clean the area thoroughly and drive the car for fifty miles or more. Oil pressure switch? Best Answer. Copy. (Retail $0.17 CDN) Could be losse or have a small crack in the plastic kemo I'm with Kemo, and it's the easyist and quickist thing to try, you can get a new one at the autoparts store,take the old one with you to match up. M. 4. This is a good time to install a gauge to monitor your op. After changing my oil last time I have had some high oil pressure readings. Equipment B6100, B7100, B8200, B9200, G4200, L175 . Tighten it further using the 1/16" deep well socket, ratchet, and extension. Replace it. A friend and I were talking about it and I showed him where I thought it was leaking. Step 2 - Install the new oil pressure sending unit. This is an important sensor as it warns the driver of. I believe the O-ring is not available separately though. Have located the sending unit but oil cooler and 4WD in the way. They usually cost around $30. I even went to the dealer for one and it started leaking after a few months. Will one of these do? If you can pinpoint it as the culprit, I would drain the oil, remove the sending unit, use some Loctite, screw it back on, then replace the oil filter and fill it up with oil. Oil pressure sending units can cost anywhere from $30 on the low end to more than $100. First question is, what sensor is that? its located next to the oil filter with a wire coming out of it. The sending unit is a small gauge that sends oil pressure information to the dash gauge. . All signs lead to it being the Intake Gasket which is why it was . Once the engine is started, you should see a normal oil pressure reading on . Yours is an 88 but they list the same part # as i used on my '85 for your . #2 RRxing, Feb 14, 2015. It's a metal line going to a mechanical gauge, so it's modified from the original. Clean the engine well and look for source of leak, one place is oil pressure sending unit. so as long as the oil pressure sending unit is 1/8bspt, i can get the adapter and it will fit into the 'sandwich' on the oil filter, and I can still have my oil pressure switch functional without having it in the block. Install the engine oil pressure gauge sensor fitting, if removed. Jul 13, 2015 I had the exact same problem on my jet boat. The sending unit is leaking and isn't working anyways (needle is pegged all the way to the high side even with the truck off) so since it has to come out anyways and its in one of the most inconvenient spots under the hood, i might as well put it back where it belongs. Sep 29, 2011, The plastic and metal are one unit. Basically a very thin walled socket so it can go over the sending unit without hitting the engine block. part number for the long sender iss4133 . The adapter between the block and sender wasn't tight enough. A. Apogee Member. Can't remove connector but might get a socket on it after connector removal. RESULT: Car on fire at track speed and no brakes. Male. Remove front splash shield. Ian G. 1996 GMC Suburban: 330 000 km: 2nd Owner, Very Well Maintained. NHerron said: Rule of thumb, don't use tape, use liquid sealant (paste). To replace, unplug the electrical connector and unscrew it from the engine block. Remove the engine oil pressure gauge sensor using the J 41712. Disconnect the electrical connector from the Oil Pressure Sending Unit by sliding the yellow tab to the side and then press the connector locking tab to release it. This . Raise vehicle on hoist. Most likely leaking from the back of the intake manifold. Then, attach the harness connector to the new switch and re-install the engine cover. I have the extension that comes out of the block on the drivers side with the sending unit mounted on the end it is a stock extension as far as I know. PCV valve is connected to full manifold vacuum at the carb, Valve cover breather on the other side is just a filter with a hose going into the bottom of the air cleaner pan. A couple weeks later she called that the car was leaking a lot of oil and had enough sence to pull off the road and call. A common cause is the oil pressure sending unit. Since putting the motor and tranny back in the car, I can't seem to get the oil pressure sending unit to stop leaking. I think I'm just gonna wait until further into Fall and go ahead and redo the lower intake gasket and also put in a new cam sensor at the same time. You should be able to get a low pressure switch from any large auto parts store with the correct threads. I've got RTV high-temp copper and water pump gasket kinds in the garage. . I purchased a 1 1/16 inch oil sending unit socket. It was leaking pretty bad, so got a new one from dealership, when I went to replace it the old one pulled right out, they stripped the cast aluminum threads so Im screwed for a bit. Jul 18, 2004. It is attached to the engine block. They last a while but then start to drip, looks like at the seam at the base, not sure oil is everywhere. ers-scat/?part_name=oil-pressure-sending-unit Good Luck . Just found a small oil leak in my lml, and am looking for some info. Notorious leak spot.Also make sure your oil pressure sender - whether idiot light or tube for mechanical gauge - isn't leaking. At idle it drips about once a second, at PTO speed it looks like a coffee maker, leaking about a quart of oil an hour. Not every vehicle comes equipped with such a gauge, although most have. If you find no oil in the connector you can use teflon tape or thread sealant to fix it (the factory uses thread sealant). I figured I'd update this thread because I just put on a new oil pressure sending unit. A hands on guide on how to replace an oil switch/sensor leak.Very simple to do for a DIY home mechanic. You can use an oil pressure sensor socket on it or if you have room, a more universal wrench or pliers. Remove the engine oil pressure gauge sensor fitting, if necessary. Questions are; Is it a big deal if it weeps a little? If you leave a few threads uncovered you will be fine normally. In the diagrams down below I have included the Original Equipment Manufacturer [OEM] part number for you. Which kind is preferable? Thread in the new oil pressure sending unit by hand. Pulling the motor seems extreme nut it would offer you a chance to inspect everything. The Oil pressure switch is at the back of the block behind inlet manifold on a clevo. Remove the oil pressure sensor (1). Connect oil pressure sender wire. You will need to wash off the area and run it to see exactly where the oil is coming from. When the oil gauge begins to rise too much and reaches the . I have also developed a TERRIBLE oil leak on the passenger's side of my engine. Some paste type thread sealant should be used. After putting it on stands last night, I went and checked under it this morning and I have a new coolant leak. If you pull the wiper motor you will have better access to the op sending unit. Only drove it a couple times, but the oil level is definitely down. 2009 Silverado 2500HD CCSB LTZ Diesel FASS 95 Lift Pump (with Baldwin filters), Edge Evolution CTS2 Monitor w/Dash . I just made up my mind to pull the motor. Remove the Oil Pressure Sending Unit Cover by removing three bolts using the ratchet and 15mm socket. you can do it yourself. If you know what your doing either way will work. You can find oil pressure sending units at auto parts stores or online parts stores. Many years ago I had one leak on my daughters car and replaced it. (Use the extension as required) See photo - 3. Premium Member, Joined Mar 16, 2010, It dont matter if you have the 2.5 engine or the 4.0 these sensors are known to leak and its a simple and easy fix. The moment the oil sending unit fails, it triggers the warning light and sustains the display until the problem is rectified. The average oil pressure sensor replacement cost is between $50 and $250, depending on the car model and labor costs. Got_Mud? It is against environmental pollution efforts to allow for such a defect to continue. Ask them for the old sending unit, it may have been dripping a little, but if it was spraying oil (large leak) it should be visibly cracked at the plastic end. It has an oil leak that I thought was the oil pan gasket. Paul1958, Registered, I have a mystery oil leak I could use some assistance with, in the 125 000 km I have owned the truck I have now done the Intake Gasket twice, the oil cooler lines twice, the oil filter housing gasket twice. I started looking harder. Stuck spark plug is bad if in aluminum head. I have installed 2 different oil pressure sending units on my 302 in the last 1000 miles. H. Installation is the reverse of removal. 1993 Grand Cherokee Limited 5.2L AWD. That would make sense. the rubber boot on the connector is just to keep water and dirt out of the connection, not to keep oil in. Between $121 and $160 is the average cost for an oil pressure sensor replacement. E/S . 1) remove oil filter 2) slide red tab on backside (just push it from one side or the other until it moves a bit) (My connector just cracked off ) 3) Pinch tail end of connector near the wire and slide off 4) Use 1-1/16 deep socket ($10 at sears) to loosen/remove old sensor A guess but cheap and easy and you you know its usually the simple things we overlook. I called my friend Eric O and asked what would be the most common cause of an oil leak in that area , either the oil. If the oil level is normal, the suspect is usually a defective oil pressure sensor. How to FIX a leaking oil pressure sending unit on Peterbilt with a Paccar Engine. I've got a '71 Chevelle with a 383 stroker that I recently did a lot of work on. I saw a dodge neon oil pressure sending unit blow its diaphragm and leak all of its engine oil out through that little sensor it is amazing how fast the oil shoots out of that little sensor. . Nov 21, 2002. they do leak sometimes. just unplug it, take the old 1 off and replace. Link, Disconnect the negative cable from the battery. Damaged oil gauge switch, wrong engine oil, faulty sending unit, leak in oil line, deposit in oil filter and pump or even worn out engine parts can be responsible. The best, and really, the only way to fix this problem is to simply replace the oil sending unit with a new one. The complete fitting part number is a Weatherhead # 68x2 (Retail $1.40 CDN) which is 1/8 NPT pipe thread on one end (which screws into the engine), and the other end is a 1/8" tube compression fitting. Find me @ DSM Revival. Jan 21, 2005. unplug the sending unit and if there is oil in the connector the sending unit is bad. Wouldn't hurt to remove, clean, add sealant and reinstall. You can buy JUST the ferrule if you like. :s maine-e-axe, Dec 24, 2009 #7 Russ Conder New Member 4 0 0 Cost 15 dollars at auto Zone. x3 run your finger back there and feel around until you find the point where the intake, the cyl head and the block meet, both sides. It looks to be emanating from that block of metal sticking out where some kind of sensor is attached. Depends on whether is it leaking at the threads or somewhere internal to the sensor. Thats where I have the oil pressure tapped at now but the sending unit . Remove the pressure sender (2). Ok so never had leak before build now i have a oil pressure sending unit leak. Change the oil and use the proper viscosity (such as 5W30) and an oil that meets the GM specification. An oil pressure sensor costs $30 to $100, and the labor costs $20 to $150. As supplied out of the box teflon tape on new unit, Taped with teflon tape, ARP teflon based thread sealant paste, Loctite thread sealant, Teflon tape and Loctite thread sealant, Permatex Aviation Form-A-Gasket, All leaked and still leaking. If the engine then shows low oil pressure - change the oil pressure sending unit (switch) - using an OEM ACDelco switch (unless leaking above and it you changed it first). I never experienced any oil pressure gauge problems just a massive oil leak . If you have an oil pressure idiot light instead of an oil pressure gauge I would assume the 3 prong one that O'Reilly's has should work because I used that one on my 1985 with a 318 engine and mine has the idiot light instead of the gauge. Tape will not squeeze out like liquid sealant though. (2) oil contacts catalytic converter and ignites. Faulty Oil Pressure Sending Unit. Use an OEM ACDelco oil filter. Very possible that the pressure switch is leaking. Also, it will still ground with sealant on the threads. $0.25 oil leak fix. Any ideas? Could it be leaking from a bad seal where the sensor attaches? 3 - Chester 8 85MR285 Hold the engine oil pressure gauge sensor fitting with a wrench. D, dwendt44, Joined, May 17, 2006, Messages, 4,479, Location, Clean the area real good then keep a watch to locate the source. He noticed it was leaking above the line where the oil pan connects to the block. One of the early symptoms of a bad oil pressure sending unit is the automatic display of the oil pressure warning light. I guess I mean will it suddenly get bad enough to cause a real problem? Vehicle: Other Hybrid. It leaks down internally and gives the appearance of a rear main seal leak, because of where it is located and where the O-ring seals inside the block. That picture is of a sender unit for oil pressure light. Disconnect the oil pressure sensor electrical connector. Spray PB Blaster around plug several times after engine is warm and let sit. 2. ($10) and the leak is still there. Can barely get a finger on it. . DIY Step By Step Guide On How To Fix It Yourself. Apr 6, 2007, #1, I've got a leaking oil pressure switch/sending unit and will be replacing it tomorrow. The O ring mentioned is just above the sending unit in the head gasket and seals the oil pressure port from the block to the head. Same here. Where you decide to shop for your oil pressure sending unit depends on your budget and the urgency of the replacement. Rather than treating the symptom, the source of the oil leak should have been addressed. The leak is coming from the brass fitting that screws into the . Can't be fuel or coolant related or those fluids would be leaking. I have had cross threaded and corroded plugs take . . Under so-called hard braking, as reported in the recall notice, where is the oil supposedly leaking from. 2. I recently installed a new 16-valve oil pressure sender on my 20-valve (same location and thread pattern as the 16-valve) and didn't use anything; no leaks after 1000 miles. Can you clean an oil pressure sending unit? The OIL SENDING UNIT is the device than senses oil pressure in the passage after the oil pump. If you have not heard before, here is the worse case event sequence: (1) oil leaks from sending unit during high speed on the track (driver unaware). Leaking oil pressure sending unit I have changed out my oil pressure sending unit several times and they all start leaking with in a few months. High Oil Pressure Reading (Oil Gauge) The most popular method of determining if your car has high oil pressure is through an oil pressure gauge. The oil pressure sending unit was way lose. Installation Procedure 1. Since a new oil pressure switch costs about $15, it's usually cheaper to replace it yourself than to pay a pro to diagnose it. Clean the area and wait until your next oil change. I thought it was my oil pan gasket, then I thought I might have bent my oil filter--it was neither. It is dripping down the side to the back edge of the oil pan. Weatherhead P/N for that is 60x2. Oil pressure senders have always been a source of oil leake in all car lines. The oil sending unit is leaking on my L175. Seems to be the oil pressure sending unit in the block.wiring harness down to the pan sensor is wet. Open Questions: Install the oil pressure sensor (1). Update: Turns out a diesel performance shop replaced the oil pressure sending unit before I bought the truck. 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