Another “top-of-engine” oil leak location is around the inside of the valve cover gaskets — toward the valley. This seal is located between the engine an… Have you measured crankcase pressure at higher engine speeds? Head to your local auto parts stores and pick up BlueDevil Rear Main Sealer. I could visually see oil leaking past the seal and was happy with that. And that will require engine removal to retrieve it. It is most likely a crankcase with excessive pressure. 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. I've owned over a dozen diesel pickup trucks in my life and always worked on them myself. See if you can visually see exactly where your oil is coming from. I'm the owner of Dead Head Diesel. Now, this is where I share everything I've learned about DIY diesel maintenance, troubleshooting and repair. 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. You mentioned the crankcase pressure was tested with the rear main seal already pushed out. I know exactly where you are coming from. BlueDevil Rear Main Sealer is a versatile rear main seal fix for seals that are dried, cracked, or shrunken due to age or use. When you buy through links on our site, we may earn an affiliate commission. 6.4 Powerstroke oil capacity is huge by "normal" gas truck standards. Dead Head Diesel is a participant in various affiliate networks, including AvantLink, CJ, and others. Sure some YouTubers have shown how they do it. There are several culprits responsible for a leak in the valley. There are also the large oil rail plugs on the back of the heads. Rislone Rear Main Seal Repair is one of the only products of its kind on the market specifically designed to solve rear seal oil leaking problems. Thank you Bill. Yes good point, I actually found some very good discussions on here about the different methods people are using to read crankcase pressure. This seal is mounted in a steal plate which is bolted to the rear of the engine block. 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 I was also thinking if checking the crankcase pressures with a rear main that is faulty would that not throw my readings off? Oil may leak from multiple areas of the engine, but the rear main seal is one of the most frequent sources of a leak. Not aftermarket I'm always wary of using longer flexible tubes for this application in case the tubes flex and skew my readings. The pressure could be in spec at idle but not at 3000 RPM. Fast forward and it is once again leaking out the rear main. 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. But be careful, you can over-tighten it pretty easily and then it won’t seal again. 3. Leaking diesel that runs through the engine valley and down the back of the motor. 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. Checked crankshaft end play to be within spec(actually was under spec!?) I live in California. It’s on the underside of the HPOP. Do yourself a favor and if you see even a little oil leaking around them, perform some preventative maintenance—change the o-rings before they fail and dump all your 7.3’s engine oil into the valley. Step 2: Check Your Cover Gasket and Valley Pan. (paraphrased statement to Michael Wan) - It's not a misidentified leak somewhere else, the OP noted the seal is pushed out, Yes, first time the oil leak was so severe it essentially undercoated the vehicle and left puddles. The BlueDevil Oil Stop Leak is another excellent formula. That’s because an untimely slip and you’ll drop the internal backing to the nut and probably the o-ring down into the oil pan. The 7.3 HPOP reservoir gasket to the front cover or the reservoir top cover gasket. It’s seated and sealed with an O-ring.eval(ez_write_tag([[300,250],'deadheaddiesel_com-leader-2','ezslot_10',137,'0','0'])); That IPR o-ring can wear out or get damaged in a poor installation and then leak as well, causing oil to seep into the valley, eventually making its way by gravity down the backside of the engine. I bet you will see higher than normal readings, then fix the crankcase pressure concern. Thank you. Other Entailing Services. While not common, the rubberized seal at the back of the engine, sealing the crankshaft at the back of the engine block where it bolts to the flywheel, will eventually dry out and leak. 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. It’s a good idea to check the valley frequently. Ford Super Duty pickups have become notorious for dripping oil. That is correct, seal is from the dealer. 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. And you’ll have to R&R the turbo pedestal to replace them. 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. Manometers are also mentioned, always learning! Hey guys, I want to make sure I cover all my bases here so this vehicle is once and for all repaired. Do not take it to the car wash or use a high pressure hose. Decisions that require preventative maintenance and parts replacement over time. (https://youtu.be/ZhTSfPspm9Y). I know that it can cause misfires and vct codes to come up, but again, for Chevy, not sure on infinity. Replaced rear main, oil leak fixed but no diagnostics were done to verify the cause of the leak. Average Rear Main Seal Repair Cost – To Have A Mechanic Replace Rear Main Seal. Transmission is out and I find the rear main to be pushed out. After searching the Internet for more hours than I spent fixing my trucks, I created this site to keep track of all that info. Sometimes the plug on the rear of the HPOP leaks (See location in diagram above). Hi Paul, the original seal was not pushed out, just leaking badly. Lucas Engine Oil Stop Leak is an all new formulation of Lucas additives and very specific base stocks designed to stop seal leaks in engines! And services for model years 1990 to 2021 to get caked all over place... Gauge and tape to the oil rail end plugs I would also suspect a faulty crankcase breather system have all! Some very good discussions on here about the different methods people are using Nissan /infinity seal hope... A very inexpensive o-ring to reseal it another excellent formula valley frequently product not! 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