Isx Cummins Leaking Oil From Blowby Tube. Whether you’re dealing with a valve cover gasket, oil c

Whether you’re dealing with a valve cover gasket, oil cooler, or one of the many other potential leak sources, proper diagnosis is the key to effective repair. #crankcase #semitruck #mechanic #emis. Below, we’re using the ISB 24-valve 5. He is a big fan of the truck and the engine (transmission is another story) but the other night he noticed quite a bit of oil around the blow by tube and all over the steering box and everything else. This can result from issues such as worn piston rings or a clogged crankcase Sep 4, 2007 · On my truck I had a lot of oil on the blow by tube and though I was losing oil from there. You could have front cover / cam cover leaking. Dec 13, 2017 · Off the top of my head I believe Cummins runs an exceptable oil pressure of 10 psi at idle, but don't hold me to it, I would have it taken to a shop and have a compression test done on your cylinders and check to see if the oil shaft seal in the turbo is starting to leak, possible valve guide seals are leaking also. This service manual is an assistant for motorists to provide effective following the operating engines Cummins series ISX and QSX15. Despite replacing the head, pistons, liners, and water pump, inspect the crankcase ventilation system for blockages causing pressure buildup. Aug 5, 2021 · These procedures include the compression and leak-down variety, the rarer yet useful manometer test, an oil analysis, and even a vacuum leak inspection. A shop can do a diagnostic for you where they will steam clean the engine, inject dye and then black-light it to determine the origin of the leak (s). Any advice/assistance will be greatly appreciated. 9L Cummins for our blow-by diagnosis and testing examples. Aug 8, 2025 · Discover common causes of oil leaks in Cummins ISX engines, proven troubleshooting steps, and maintenance tips to keep your engine running efficiently and prevent costly repairs. Oil leaking from the blow-by tube on a Cummins engine typically indicates excessive pressure in the crankcase. 2 days ago · Rawze. 30,000 miles then the blowby tube was full of muck,took oil sample,was coolant,then they found head cracked! Jan 31, 2011 · Front structure leaks are common for that year, as well as head gasket leaks on the drivers side rear of the head. Jun 3, 2017 · Hello all, I'm rather new to this forum. Oct 1, 2012 · The Cummins ISX engine has a blow-by filter on the top left side of the engine and there is a one-way valve in the canister filter that could malfunction, creating excess crankcase pressure in the engine, enabling the filter to clog again, creating the excess blow-by pressure in the crankcase, and causing the turbo to throw oil into the exhaust Mar 26, 2012 · When was the last time you gave it an oil change? Did you use the correct oil? If the oil you used isn't designed for diesel engines ( high detergent ) detergents in the oil might be to low causing the rings to foul and thus allowing blowby and venting out the tube, Change the oil with something of a different Brand and viscosity For sale 2008 cummins isx cm871 complete engine fan clutch to flywheel. May 1, 2010 · Trying to determine cause of high bottom end pressure. Apr 24, 2025 · Cummins ISX oil leaks on the driver side are common but manageable issues in these otherwise excellent engines. These allow combustion gases to escape into the crankcase, increasing pressure and pushing oil past seals. Has 375228 original miles NOT a rebuild, engine runs, oil is clean no dilution or contamination has roughly 40 lbs oil Jan 31, 2011 · Front structure leaks are common for that year, as well as head gasket leaks on the drivers side rear of the head. Click to explore verified suppliers and best deals now. Jan 13, 2010 · That fixed isssues for approx. Apr 26, 2017 · 4)Cylinder rings are worn or cylinders are glazed enough to allow excessive blowby for the crank breather and the dipstick tube, but not also the fill tube 5)Significant internal cylinder pressure leakage from time and wear indicating an overhaul is or is soon to be required Oil leaking from the blow-by tube on a Cummins engine typically indicates excessive pressure in the crankcase. The blowby tube discharge appears to be clear. I've been having issues with a lot of white smoke coming from my oil fill cap. Coolant leaking through the crankcase filter and blowby tube, without mixing oil or coolant, suggests a compromised head gasket or cracked cylinder head. I took the truck in and come to find out my rear main seal was leaking and some how the oil was collecting on and inside the blow by tube. Removing oil filler cap or dipstick this engine pushes out a lot of oil smoke and gets worse as it warms up. At first we thought it Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / Lot of blowby after rebuild Dec 13, 2017 · Off the top of my head I believe Cummins runs an exceptable oil pressure of 10 psi at idle, but don't hold me to it, I would have it taken to a shop and have a compression test done on your cylinders and check to see if the oil shaft seal in the turbo is starting to leak, possible valve guide seals are leaking also.

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