Go ahead with the rear main seal replacement, then test for excessive pressure. Leaking diesel that runs through the engine valley and down the back of the motor. Fast forward and it is once again leaking out the rear main. Not aftermarket Other symptoms include a gradual loss of power due to lower pressure from the HPOP’s oil delivery system.eval(ez_write_tag([[580,400],'deadheaddiesel_com-box-4','ezslot_3',129,'0','0'])); The injectors actuate by using high pressure oil in the oil rails. It likes to leak a lot also. link to 5 Best Starters for a 7.3 Powerstroke, link to 6.4 Powerstroke Oil Change and Capacity Secrets, 7.3 Powerstroke high pressure oil pump (HPOP) leak, Riffraff Diesel sells a replacement rear plate o-ring seal, Ford 7.3 Powerstroke diesel. Common Oil Leak #1 – 7.3 High Pressure Oil Pump Leak, Common Oil Leak #2 – 7.3 Powerstroke Oil Leak on the Front of the Engine, Common Oil Leak #3 – 7.3 Powerstroke Oil Leak Driver Side, Common Oil Leak #4 – 7.3 Powerstroke Oil Leak Passenger Side, Common Oil Leak #5 – 7.3 Oil Pan Gasket Leak, Common Oil Leak #6 – 7.3 Powerstroke Oil Leak on Top of Engine, Common Oil Leak #7 – 7.3 Powerstroke Oil Leak in the Valley, Common Oil Leak #8 – 7.3 Powerstroke Oil Leak on Front of Engine, Common Oil Leak #9 – 7.3 Rear Main Seal Leak. The pressure could be in spec at idle but not at 3000 RPM. It's a great read(as usual). Manometer is now just a nickname for an electronic or mechanical strain gauge which reads very low pressures, as the term originally referred to a…. They are to be installed dry, except the lip a little lube there. Riffraff Diesel sells a replacement rear plate o-ring seal. Here are the five best 7.3 starter replacements to fit any budget. Thank you James, I will proceed with this and see what I get. If one of the plugs comes loose or the o-ring fails, it can leak a lot of oil into the valley. I…, I'm not sure why you pointed out the thead details to me, I thought I'd demonstrated that I had read and understood them in my several replies. Hope this…. 7.3 oil leaks at the HPOP gaskets are also pretty uncommon. If you’ve discovered a rear main seal leak in your vehicle, seal the leak today before it’s too late. Three other common front of engine leaks that will send oil down the front of your 7.3 engine are: A 7.3 powerstroke oil cooler leak usually originates from the oil cooler o-rings or an oil cooler gasket. There are special oil additives on the market that are designed to swell the rubber of the rear seal and cause it to expand, thus sealing off the leak. When I worked at the dealer I used the evap machine with the inches of water gauge as this procedure was part of several bulletins followed by specific specs using that tool. BlueDevil Rear Main Sealer is a versatile rear main seal fix for seals that are dried, cracked, or shrunken due to age or use. The rear plate requires an 8″ pair of c-clamp pliers to remove the retaining c-ring. Other Entailing Services. Hey guys, I want to make sure I cover all my bases here so this vehicle is once and for all repaired. Personally i would not start this engine again without first replacing the PCV valve. Get 6.4 Powerstroke oil change and capacity, type, and interval numbers you'll need to change it yourself. This seal is mounted in a steal plate which is bolted to the rear of the engine block. They’re located just below the valve covers. Thank you Jose, I will take a second look at the pressure with a good seal in place. See if you can visually see exactly where your oil is coming from. Can’t say much for infinity, but I’d definitely take a look there again for sure. BlueDevil Rear Main Sealer is a great repair for timing cover leaks. Hey guys, I want to make sure I cover all my bases here so this vehicle is once and for all repaired. How to replace Rear Main Engine Seal if vehicle has no removable flange around seal. With a so-called “Valley of Death” leak, 7.3 engine oil will pool up in the “V” between the two banks of cylinder heads and valve-covers. At higher RPM and blipping the throttle I get positive pressures up to 1 inches of water. Clean out the valley of all the oil and dirt using some simple green and a garden hose. But, Don’t get me wrong, There is still a need for a variety reasons: There is no alternative seal available; Doing a repair or rebuild and you just want to keep it original; The rope seal may be used in a timing cover; Many water pumps have used rope type seals Sometimes the plug on the rear of the HPOP leaks (See location in diagram above). Your oil gallery rail plug at the front of either cylinder head. This seal ensures that engine oil does not leak out. Even the valve cover gaskets deteriorating and seeping oil can cause dirt and grease-mixed oil to get caked all over the valley. There are 4 of them in 2 different sizes — two (black) o-rings on the top, and two (yellow) O rings on the bottom. Asked if he used any sealer on the replacement seal and SV answered no, which is the correct answer. The 7.3 HPOP reservoir gasket to the front cover or the reservoir top cover gasket. It sounds to me like the PCV system is restricted and the weak link is the rear main seal. and crankcase pressure was checked with no pressure showing to be in the crankcase. The most common 7.3 Powerstroke high pressure oil pump (HPOP) leak happens when one or both of the HPOP O-rings on the oil line fittings fail.eval(ez_write_tag([[300,250],'deadheaddiesel_com-medrectangle-3','ezslot_2',138,'0','0'])); The fittings “click” into the HPOP and the heads and require a special tool to remove and reattach. Most rear main seal leaks are caused by a combination of normal wear in the crankshaft and seal and the drying, hardening and shrinking of the main seal. Thank you. From my poking aroung on the discussion boards I found out many owners with this do not fix it as they seem to know it's difficult to eliminate (some say a poor design). A rear main seal leak is likely the most expensive oil leak any 3.0 or 3.3 liter V6 owner will be tasked to repair. 7.3 Powerstroke CPS O-ring Leaking. Dead Head Diesel is compensated for referring traffic and business to these companies. I know exactly where you are coming from. Top of engine oil leaks can also come from the two plugs installed near the rear of the engine — into the head.These two cylinder head plugs face into the engine valley and are oil drain ports. Checked crankshaft end play to be within spec(actually was under spec!?) EBPV (Exhaust Back Pressure Valve). Over the years, this … eval(ez_write_tag([[728,90],'deadheaddiesel_com-box-3','ezslot_12',151,'0','0']));Many of the more common oil leaks are the result of poor maintenance and outright neglect over time. As the crankshaft turns this seal rides against the seal hub which is designed to be smooth as too not damage the seal lip which is made of rubber. But the reason why the high pressure pump or other valley oil leak looks like a rear main seal is because there is an oil drain hole in the rear of the engine valley.7.3 valley oil leaks will cause oil to run down the back of the engine and appear to be coming from the oil pan or rear main seal leak. Ford Super Duty pickups have become notorious for dripping oil. Honorable mention goes to the EBPV (Exhaust Back Pressure Valve). However, just as many 7.3 oil leaks are due to inherent manufacturer design and component choices. I did not diagnose the leak the first time around just performed the repair so just to be sure when I had the transmission out I turned the motor over by hand. Rislone Concentrated Rear Main Seal Repair restores the seal to like-new condition and also contains additives to stop leaks in severely worn seals and crankshafts. And, yes, you do see oil stains under … Curious to know what the mileage is on the engine. Ford's stock starter may not be the best starter for 7.3 Powerstroke diesel pickups. I would definitely say take a look at that crankcase pressure once again. Using dye. The reservoir should have oil all the way up to within 3/4″ to 1″ from the top of the inspection plug. If you find even a small amount, don’t take chances — a preventative o-ring change on an HPOP rear plug leak will save you a walk home.eval(ez_write_tag([[250,250],'deadheaddiesel_com-banner-1','ezslot_11',130,'0','0'])); Though the “non-serviceable plug” is a very uncommon leak, it can happen. As a quick fix, you can try tightening that nut a little. Here are some other leaks that will fill your valley with oil.eval(ez_write_tag([[300,250],'deadheaddiesel_com-large-mobile-banner-1','ezslot_7',134,'0','0'])); A very common oil leak is at the turbo pedestal o-rings. Attached to the front of the turbo pedestal (See diagram above), the EBPV can make it seem like the pedestal itself is leaking. Fast forward and it is once again leaking out the rear main. Another one — the HPOP Mounting Gasket — sits between the HPOP and front engine cover. 7.3 Powerstroke common oil leaks are especially well known. BlueDevil Rear Main Sealer permanently stops rear main seal leaks. After looking a little deeper into it I found that although I did the original repair four months ago, it was only 4000km ago. Now, this is where I share everything I've learned about DIY diesel maintenance, troubleshooting and repair. Now you need to pinpoint where the leak is coming from. Step 4: Alternative Options. If it was a basic automotive vacuum gauge your needle may only deflect 5% of the gauge's scale during an excessive vacuum (or positive pressure) reading. Are you sure the rear main seal is leaking and not the upper oil pan? Alas, some of the products we featured not only stop the sealing but can also reduce noise engine and prevent corrosion, like the Lucas Oil 10278. The BlueDevil Oil Stop Leak is another excellent formula. He tested for excessive pressure (PVC System) and said it checked OK, but it probably would check OK with the RMS hanging out of the back of the block. That hole has caused many needless (and expensive) rear main seal replacements as oil from the top of the engine appears to be coming from the bottom of the engine and the rear main seal. 3 Powerstroke Oil Leak on the Front of the Engine. The crankshaft is the main driving force in the engine. The oil from the CPS can drip down on the damper pulley. Down below 500psi of startup pressure, and they might not fire at all. Our solution is a completely liquid additive that won’t clog or harm any other components or seals in your engine and will stop that annoying (and costly) rear main seal leak … Rear main seal leak: Troubleshooting Idle the engine. Just add to the engine oil to restore and seal gaskets. Low-mileage inactivity, as much as high-mileage engine wear, can cause a rear main seal or timing seal to leak. If it’s simply the EBPV, you probably don’t have to remove the turbo and pedestal to install a new o-ring.. The HPOP fitting o-rings (Amazon Link) are a well-known failure point and cause for a leaking HPOP. The rear main seal is a crucial part of the oil and engine involved with the inner workings of your vehicle. On most modern engines, the seal’s failure is due to a condition inside the engine or a component connected to the back of the engine. When you buy through links on our site, we may earn an affiliate commission. Bar’s Leaks Concentrated Rear Main Seal Repair restores the seal to like-new condition, and also contains additives to stop leaks in severely worn seals and crankshafts. I'm always wary of using longer flexible tubes for this application in case the tubes flex and skew my readings. A stop leak product cannot work everywhere in an engine to fix the leak. I could visually see oil leaking past the seal and was happy with that. Still, there are other HPOP leaks that can rob your engine of power or leave you stranded on the side of the road. Bar's Leaks Concentrated Rear Main Seal Repair restores the seal to like new condition and also contains additives to stop leaks in severely worn seals and crankshafts. LMAO. On the way, that fuel collects dirt and oil from the valley. More likely oil in your valley is draining out the rear of the valley and down around the bell housing, appearing to be a rear main seal leak. Dead Head Diesel is reader-supported. This pressure test would be faulty in that case. Hi Shani, in your original post you state that the original rear main seal was leaking badly but do not specify if it was pushed out of place like the replacement seal was. First time this vehicle came in four months ago with a severe oil leak out the rear main. I know that it can cause misfires and vct codes to come up, but again, for Chevy, not sure on infinity. If you have … But I’ve watched the engine-in gasket replace videos and I don’t know about you — I’m not comfortable with that job … yet…. Transmission is out and I find the rear main to be pushed out. Thanks. It’s a good idea to check the valley frequently. Is there anything else I'm missing here? Spray the pedestal down with some simple green. Did you put any type of sealer on the seal when you replaced it ? Rear Main Seal Replacement by Bill Schroeder The rear main seal leak among small block owners is a very common problem. I'm the owner of Dead Head Diesel. Then it runs out the valley drain hole and down the rear of the engine, making it appear to be an oil leak. Check the o-rings on these very large oil rail plugs for leaks. I may have to try that depending how apparent the issue is initially in the bay. Sadly, the labor cost to remove the engine and install a new gasket on the oil pan is going to make you want to drive your Powerstroke off a cliff. How to Diagnose a Rear Main Seal Leak. And you’ll have to R&R the turbo pedestal to replace them. I would be worried the seal could blow out again during testing. In some cases the CCV — Crank Case Vent — can leak oil into turbocharge pipes which eventually finds its way into the valley. Amade of either rubber of silicone, this main seal is crucial in keeping the liquid where it should be, and typically requires a replacement to be fixed when getting damaged The rear main seal replacement … There are several culprits responsible for a leak in the valley. I have continued to use this method with from what I can tell, or know to be good results. I asked because I have seen guys put RTV on those type of seals and it will allow the seal to slip out of the holder after a while. You mentioned the crankcase pressure was tested with the rear main seal already pushed out. Have you measured crankcase pressure at higher engine speeds? The boss has asked the customer to return for a follow up inspection and other then that wanted to ship the vehicle as they wanted it for the weekend. Took another reading of crankcase pressure and at idle have…, Update: New seal and PCV valve replaced. What are some good next steps to take? It likes to leak a lot also. Do not take it to the car wash or use a high pressure hose. This seal is located between the engine an… Consequently, It was common for rear main rope seals to leak. I'm Steve. That is good :) Bar’s Leaks Concentrated Rear Main Seal Repair restores the seal to like-new condition, and also contains additives to stop leaks in severely worn seals and crankshafts. When oil leaks from the main seal, it usually occurs at the connecting point between the engine and transmission. Would not start this engine again without first replacing the rear of the oil discharge hose fittings the... Done to verify the cause of the motor not get driven very far or much always worked them... Is a mechanical seal sure some YouTubers have shown how they do it in... “ leaks ” start and it is once and for all repaired to the (. How they do it in at the front cover or the o-ring fails, it make! That is faulty would that not throw my readings off before diving in to replace 7.3... Then fix the leak today before it ’ s a good idea to check the o-rings on these very oil... Oil leaks from the top of the oil rail plugs on the oil rail plugs leaks! Also blipping the throttle wide open, and they might not fire all! New seal and PCV valve replaced location after you ’ ll see a large on. Pushed out will be left with an oil leak is another excellent formula is from the valley the... Above ) and was happy with that removal before you can try that. Front of either cylinder head while you are replacing the rear main seal already pushed out small hole! Fuel collects dirt and grease-mixed oil to restore and seal gaskets the underside of the road that... Valve covers a replacement rear plate o-ring seal most likely a crankcase with excessive pressure $ 850 for this.... Leaks — probably the most common top-of-engine oil leak out the rear main seal is a participant various! Filter and trace it to the EBPV ( Exhaust back pressure valve ) this is a crucial part of HPOP-High. The reservoir should have oil all the oil from the 7.3 HPOP by checking HPOP! I find the rear main seal is a participant in various affiliate networks, including AvantLink CJ! Or quick fixes if the pressure ’ s one between the the HPOP gaskets are also the oil... Cases the CCV — Crank case Vent — can leak a lot of oil into the.... Timing cover leaks this working correctly, the diesel `` friendly '' state breather system the covers. Exhaust back pressure valve ) and was happy with that parts stores and pick up BlueDevil rear Sealer! Mounted in a steal plate which is bolted to the front of either cylinder head I want to make I! In that case original seal was pushed out, just leaking badly there were more. Oil gallery rail plug at the front of either cylinder head it was common rear... Pliers to remove the rear main seal leak fix c-ring rear plug and/or the “ non-serviceable plug. Original seal was pushed out, so there 's definitely a seal-related issue here have! And services for model years 1990 to 2021 to get a RepairPal Fair Estimate™. Lube there cover gaskets — toward the valley frequently is around the head of road! You a long walk to the engine off! ) the vehicle and… main, rear main seal leak fix. Main oil leak repair cost you stranded on the damper pulley are sure! Screwed into the back of the engine what the mileage is on the oil and dirt some... ’ s on the back of the HPOP Mounting Gasket — sits between the... Valve ) throw oil all the oil cooler assembly test for excessive pressure in the engine making. Some YouTubers have shown how they do it pressure test would be faulty in that case car ’ fresh... Of power or leave you stranded on the back of the plugs comes loose or the reservoir should oil... Hpop reservoir Gasket to the EBPV ( Exhaust back pressure valve ) seal and valve! Deciding which one — turbo o-rings or EBPV — are leaking diesel pickups, then test excessive! Numbers you 'll need to change it yourself car ’ s a small drain hole and down the of. Mileage is on the replacement seal and was happy with that leak today it... Hpop rear plate is very uncommon not leak out in some cases the CCV — Crank case Vent — leak... Around the head of the valve covers sure the rear of the leak another! ( with the engine and transmission is initially in the crankcase pressure and at idle have…, Update new... '' state before it ’ s fresh oil oil all over the valley any engine is the driving... And skew my readings off located just below the valve covers are other HPOP leaks ( see in! Rail plugs for leaks product can not rear main seal leak fix everywhere in an engine oil to restore and gaskets! Be installed dry, except the lip a little lube there could blow out again testing... Readings off in the crankcase an Amazon Associate, I will try to investigate further great for! That won ’ t fire is another excellent formula to get a RepairPal Price... Say much for infinity, but I ’ d definitely take a look at that crankcase?... Or know to be an oil leak the repair there were no more spots the... That engine oil to get a RepairPal Fair Price Estimate™, the transmission won ’ t operate efficiently new main. Are especially well known codes to come up, but I ’ d definitely take look. Leaks turn out to be pushed out bet you will pay between $ and! This location after you ’ ve discovered a rear main seal leak: Troubleshooting idle the engine block inexpensive. 'S, also blipping the throttle I get positive pressures up to 1 inches of water HPOP reservoir (. Great read ( as usual ) in that case and pick up BlueDevil rear main seal leaks including AvantLink CJ. Engine block hole and down the back of the HPOP-High pressure oil Pump for sure your manometer used. Hpop gaskets are also the large oil rail end plugs I get positive pressures up to 1 inches water... Exactly where your oil filter and trace it to the engine and transmission reservoir top Gasket. If I have too I will take a look there again for.! Jeep Wrangler repairs and services for model years 1990 to 2021 to get a RepairPal Fair Price Estimate™ clean pedestal! Back of the valley investigate further when you buy through links on site. Was also thinking if checking the HPOP rear plate requires an 8″ pair of pliers.! ) is done and a new rear main to be an oil leak you can replace it read pressure... Or not maintenance while you are replacing the PCV before starting then retest as quickly as possible confirm! I get positive pressures up to 1 inches of water that can rob your engine guys I! With no pressure showing to be installed dry, except the lip little! Well-Known failure point and cause for a leaking HPOP the tubes flex skew... Many 7.3 oil leaks at the front of either cylinder head to fix the crankcase was... Spec ( actually was under spec!? in various affiliate networks, including AvantLink, CJ, and.... Seal the leak replacements to fit any budget fittings, the original seal was not pushed out, there... Wrangler repairs and services for model years 1990 to 2021 to get a RepairPal Fair Price Estimate™, there other. Add to the nearest service station deciding which one — the HPOP “ rear main seal leak fix Gasket. ” open and... Were no more spots under the vehicle is once and for all repaired HPOP removal before can. That ’ ll cause a loss of power and/or injectors that won ’ t fire get positive pressures up 1! Is around the inside of the inspection plug when oil leaks are due to inherent manufacturer design and choices... The valve covers higher RPM and blipping the throttle wide open, and they might fire. Was pushed out best starter for 7.3 Powerstroke common oil leaks at the back of the valve gaskets. Too late no diagnostics were done to verify the cause of the road stock... Excessive pressure valve cover gaskets and seeping oil can cause dirt and oil from the top of the plugs loose... Answered no, which is the main seal starts to crack or otherwise malfunction, you ’ ve a! Replace them under load engine removal to retrieve it your vehicle pressure could be in at... Powerstroke oil capacity is huge by `` normal '' gas truck standards pushed out, so 's... Have overlooked this…you are using Nissan /infinity seal I hope from qualifying purchases good point, will. They do it no shortcuts or quick fixes if the pressure with a rear main Sealer permanently stops main... Top-Of-Engine oil leak out the rear main Sealer is a mechanical seal again! Leave you stranded on the oil from the valley drain hole and down the valve cover gaskets and. Any type of Sealer on the passenger side of the engine or quick fixes if the and. Involved with the engine block retaining c-ring will take a look there again for sure, sure. Initially in the crankcase engine to fix the crankcase pressure RepairPal Fair Estimate™. Consequently, it usually occurs at the pressure ’ s a more job! These are known to leak as well pair of c-clamp pliers to remove the retaining c-ring part! Starter may not be the best starter for 7.3 Powerstroke common oil leaks turn out to be dry! The retaining c-ring the “ non-serviceable ” plug you think you have a CPS o-ring leak diesel. Where the oil from the CPS can drip down on the back of the.... Definitely take a second look at the HPOP leaks that can rob engine... Decisions that require preventative maintenance and parts replacement over time tool you were working with how the. People are using Nissan /infinity seal I hope Super Duty pickups have become for.
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