Isx cummins low oil pressure

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The Cummins Pressure Regulator Valve 4009956 is used primarily on Euro III 15 liter ISX/QSX engines. Specifications. Shipment Height. 1 In. Shipment Length. 4 In. Shipment Width. 3.75 In. ... Cummins Pressure Sensor. Part # 4954245. $466.27. Add to cart. Save to My Garage. ... Cummins Oil Gauge Tube. Part # 4948168. $65.66. Add to cart. Save to ...ISX12N (2018) The 2018 ISX12N continues the evolution of emissions-leading natural gas engines from Cummins. Certified to the California Air Resources Board and Environmental Protection Agency's (EPA) Optional Low NOx emissions standard of 0.02 g/bhp-hr, it has 90% fewer NOx emissions than the current North American EPA standard. With 400 hp ...Cummins recommends every 500K on the overhead adjustments. With regards to bearings, I didn't see anything in QuickServe specific to the ISX. Most manufacturers recommend monitoring the oil pressure and only consider a bearing roll-in if the pressure drops too low. This is not a problem of yours right now!Fault Code: 143. PID (P), SID (S): P100. SPN: 100. FMI: 1/18. Lamp: AMBER. SRT: REASON: Engine Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level. Engine oil pressure signal indicates engine oil pressure is below the engine protection warning limit. EFFECT: Progressive power … Additionally, the increased ash hold capacity of the Single Module aftertreatment system for the X15 Eficiency and Performance Series engines contributes to the extended DPF cleaning interval. 375110_Cummins_5410641.indd 1. 11/8/17 7:05 PM. CumminsLogo.pdf 1 5/8/09 2:43 PM. Truck Maintenance and Operation. X15 (EPA 2017)

My oil pressure runs at about 42psi at 220* oil at 1500rpm, with Rotella 15W40 and one gallon of Sta-Lube 85W90. The only "effect" I've noticed is that like in Rawze's inframe videos, my cams & followers have taken on a nice golden hue to them. The lobes, rollers, and everything looks great.I have a 97 Volvo Cummins m11 plus, engine fluid lamp coming on after driving 1 mile , I just changed oil pressure sensor and the oil psi is still pass 90 soon as crank on cold engine. ... Looked at the truck it had low injection control pressure. ... I have a 2005 9200 isx same problem with the six oil pressure gauge. Changed the oil pressure ...Oct 2, 2020 · I have an ISX cm 2350 Mine holds 40 - 45 cruising at 70 mph. And around 25 at idle. It has 610,xxx. On it. Yea im getting nowhere near that. cold engine: idle 30psi and at 70mph i get 40psi. Warm engine: idle 12-13 and at 70mph i get 28-31psi. Vivaspin, Dec 19, 2020. #6. Maybe newer trucks run lower oil pressure. My old Cummins motors ran 60 lbs, and Formula's were at least 50. ... 2007 ISX in my KW oil pressure runs about 16 at idle ...1. We have a 2000 Volvo 770 with a 600 ISX Cummins (Signature Series). There is a fault code that says there is a low fuel delivery. About half of the time the truck runs great and couldn't run smoother. The other half, it runs rough like there is a big cam in it. It will do this at an idle and also going down the road.Blog.Teknisi Tuesday, December 22, 2015 Fault Codes CUMMINS ISB ISC ISL ISBe ISDe and QSB3.3 CM2150. SPN157 FMI18 (Injector Metering Rail 1 Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level) Fault Code: 559. Fuel Rail Pressure Sensor. CODES: Fault Code: 559. PID (P), SID (S): P157.

Dr. Cummins I have a NTC-315 that has low oil pressure. Has new oil, filters, mains, rods, camshaft bearings, checked - Answered by a verified Technician ... Good afternoon Nick Working on isx 15 Oil pressure seems low would like a second opinion Coolant temp 203 Oil temp 210Oil pressure on physical gauge 15psi at 700 rpm 26psi at 1000rpm 32psi ...Replaced oil pump. Cummins ISX15 still no oil pressure. Replaced oil pump. Removed and checked oil cooler for possible blockages. Oil cooler is good. No blockages between oil pump and oil filter. Cranked the engine with injector harness disconnected. With a loose oil filter, no oil spills out (from the filter housing) after 30 seconds of cranking.The oil capacity of the 6.7-liter Cummins turbo diesel engine is approximately 12 quarts, and it is available in three variations as of the company’s 2013 model year. As of 2015, t...What oil temperature should a Cummins ISX have? Updated: 12/17/2022. Wiki User. ∙ 11y ago. Best Answer. Normal temp is 230 plus or min, 5 deg. Wiki User.Pull your down pipe & maybe manifold to check the exhaust ports for oil. Could be oil rings if not seated yet, but I would suspect it would burn off during combustion. 10-12psi might be on the lower spec for Cummins, but I think that is borderline. My 700k km 5.9 with over 14200hrs has 20psi at idle & 55psi at 2000rpm at operating temperature.Motor is clean as a whistle inside and oil with new oil and filter. Start motor and oil pressure is 45-50 psi and as the motor/oil warms up the pressure comes down. At 600 rpm and 220 temp on oil the pressure hovers at about 8psi and 20-22 psi at 1400 rpm. About to change oil cooler and t-stat to oil cooler. I'm ready to give up.

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WARNING!!: ⚠️⚠️⚠️Always use the proper tools and safety equipment to perform this job. Failure to perform the job correctly can result in personal injury or ...Nov 2, 2023 · An oil filter that is clogged or dirty can affect the oil pressure in your Cummins ISX15 engine. Regular inspection and cleaning of the oil filters are essential to ensure proper oil flow and maintain the desired pressure levels. Here’s what you need to do: Locate the oil filters in your engine. Oil Pressure Issue on Cummins ISX15 - How to Fix it? Cummins isx15 oil pressure sensor replacement.#oilpressuesensor #cumminsisx Playlist Recommendation: Tru...When troubledhooting low oil pressure you MUST isolate the engine from everything else. Remove the oil pressure sensor hook a gauge to the engine and check.double check the oil level if you overfilled it will aireate the oil and cause. ... 2007 ihc 9900 500hp isx cummins has low oil pressure with high oil temp. The highest oil psi is 29 but ...

When the filter is plugged, the bypass valve opens to ensure oil flow to the motor. If you have the old style valve that leaks, it causes lower pump output pressure. The new bypass valve is more properly calibrated and also seals better when closed. There are 2 sizes of plug for the new bypass valve. 16.5 mm and 19mm.Providing the Motor Coach market with a dependable heavy-duty platform, developed from a fully integrated and stable engine architecture and system design, the ISX12 provides motor coach entities with the benefit of low change. Available throughout 2018, the Buy America-compliant ISX12 will continue to use the established Cummins Aftertreatment ...Staunton,Va. 0. Ran yesterday oil pressure was normal. Shutdown for the night (no idling) and when I started this morning oil pressure was pegged at 100 psi. Turned truck off turned key to on but didn't start it and gauge went to 100 psi so figured I had a Guage issue. Ran a few miles pressure returned to normal for about 10 miles and then ...Here's the original specifications for oil pressure and a TSB about the new style pump. aluminum. housing. If you have the pump with the aluminum housing you shouldn't be getting the unexpected oil pressures as described in the TSB. I would check the oil for metal. Remove the oil filter and cut it open.2010 Cummins ISX 450 Low Oil Pressure Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Noles2013, Nov 10, 2018. Nov 10, 2018 #1. Noles2013 Bobtail Member. 3 3. Nov 10, 2018 0. Hello fellow truckers, My 2010 Cummins ISX 450 lost oil pressure today. Dropped down to about 15psi and never went any lower or higher. …As of 2015, maximum torque values for Cummins ISX truck engines range from 1450 pound-feet at 1200 revolutions per minute for the ISX 400, to 2050 pound-feet at 1200 RPM for the IS...May 5, 2013 · It's been about 10thousand miles since my last oil change in my 2009 ISX and I just started getting some low oil readings to. I just changed my exhaust back pressure sensor a week or so ago and that's been helping greatly. When I accelerate or am at cruzing speeds of 1200-1300 rpm's my oil pressure is fine, reading about 35-40 psi.

09 Cummins ISX 435 ST Low Oil Pressure Discussion in 'International Forum' started by redcentury07, Aug 2, 2014. Page 2 of 3 < Prev 1 2 3 ... My truck has low oil pressure. 20 psi, has been like this since i purchased it at 598k miles. now it currently has 610k miles and at times the truck will shut down when going up on hills at high RPM. I ...

Cummins..22-26 psi with the engine temp at 180 oil temp..oil pump…. 2007 ihc 9900 500hp isx cummins has low oil pressure with high oil temp. The highest oil psi is 29 but runs 22-26 psi with the engine temp at 180 oil temp will be 220 and if you have heavy loads the oil temp will be 250. The oil pump has been changed and made no difference.KITCO NEWS -- Gold slightly pressured Tuesday, and iiTrader’s senior strategist Bill Baruch says it's because of the downward pressure lower copper and crude prices are having ...The normal oil pressure when idling for a Cummins ISX engine is around 15-40 PSI. Low oil pressure in an ISX Cummins engine can be caused by various factors such as a scratched bore or a sticking regulator. It is recommended to have a minimum oil pressure of 40 PSI for a Cummins ISX engine.It's been about 10thousand miles since my last oil change in my 2009 ISX and I just started getting some low oil readings to. I just changed my exhaust back pressure sensor a week or so ago and that's been helping greatly. When I accelerate or am at cruzing speeds of 1200-1300 rpm's my oil pressure is fine, reading about 35-40 psi.This is a 6.7 in a 2019 Solaris bus, has 175k KM or a little over 100k miles on it. We have three buses, one engine is already gone with nearly 1300 hours of low oil pressure in severity 1. That's between 83-55 kPa. Second bus has 420 kPa at idle cold startup and drops down to 70 kPa hot. ECU has logged over two hours with pressure under 34 kPa!!Watch out for common signs of decreased engine performance such as a reduction in fuel economy, loss of power, and engine stalling. Warning light on the instrument panel turns on. This is one of the first and most common signs of low engine oil pressure. The latest car models have sensors connected to a warning light.This is a detailed video of how to diagnose and repair low oil pressure in a Dodge 5.9 Cummins. We go over, is it really low oil pressure in a Cummins, or i...The normal oil pressure for a Cummins ISX at idle should be between 15-40 PSI. If the oil pressure is consistently below this range, it may indicate a problem with the …

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When idling, the fuel pressure gauge goes all the way up and you feel the engine running rough. I replaced the fuel pump about 2 years ago, bought directly at Cummins. Fuel pump 2872399. Summary, when idling (not touching it at all) fuel pressure claim all the way up, truck runs bad, fuel pressure goes down, truck runs fine again.Hello Nich sirI hhave low oil pressure issue on cummins isx 2013. Oil pressure does not go over 35 psi.Esn 79590818Replaced oil Pressure relief valve already but still issue Oil and filter was replace … read more12-07-2017, Don't know what engine model your referring to but the number one cause of oil pressure loss in the ISX is clogging oil filters due to excess soot. Solve the excess soot problems and you solve the oil pressure issues. Things like changing the oil more often if the oil is getting too sooty, doing egr tune-ups and ensuring the engine ...09 Cummins ISX 435 ST Low Oil Pressure Discussion in 'International Forum' started by redcentury07, Aug 2, 2014. Page 2 of 3 < Prev 1 2 3 ... My truck has low oil pressure. 20 psi, has been like this since i purchased it at 598k miles. now it currently has 610k miles and at times the truck will shut down when going up on hills at high RPM. I ...Description of Change. This document announces the High-Pressure Fuel Pump Performance Test, which is an improved procedure for high pressure fuel pump diagnostics when troubleshooting Fault Code 559. The High-Pressure Fuel Pump Performance Test will: Replace the High-Pressure Fuel Pump Return Flow Test in the Fault Code 559 troubleshooting tree.Isx oil pressure low? Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Vivaspin, Dec 19, 2020. Page 2 of 2 < Prev 1 2 ... We have plugged in the computer( i dont know what its called) that has the cummins software and it read the same as the gauge. Oil changes and filter change never made a difference.Cummins Oil Pressure Regulator Valve. For all 5.9L & 6.7L Cummins engines 1989 and up. This part replaces part numbers 3902238 & 3927622. Cummins part number: 3936365. puredieselpower.com ... When you see the "low oil light", you're toast. Sourdo. Reactions: 2002CTD. Save Share.Do you find yourself constantly frustrated with low water pressure in your home? Whether it’s a weak shower, slow-filling toilet, or inadequate water flow in your kitchen sink, low...When the filter is plugged, the bypass valve opens to ensure oil flow to the motor. If you have the old style valve that leaks, it causes lower pump output pressure. The new bypass valve is more properly calibrated and also seals better when closed. There are 2 sizes of plug for the new bypass valve. 16.5 mm and 19mm.I am fairly certain I have a 12 valve. Manufacture date on door frame is Dec 97. I am having oil pressure issues on my cummins. When it is cold and at idle it is fine. Once it warms up however if I let my foot off the gas the pressure drops off completely. I checked idle it is around 760 rpms in gear max a/c using obd2 scanner.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...CUMMINS Oil Pressure Regulator. by scenarioL113 » Sun Mar 06, 2011 9:21 pm. On B-series Cummins there is an oil pressure regulator that has to do with Low and High oil pressure. It is on the oil cooler assembly. I am troubleshooting a Low Oil pressure problem and in the Cummins book it says to inspect the device. ….

RE: Oil Pressure Relief Valve/Regulator. The picture on the right is of the updated oil bypass valve. It is located in the oil filter head. There is a 17mm allen plug that you remove and it is right behind that. If you have an early 2250, there was a campaign where they would send you the updated version free.It will run at 600 RPM , drop about 5-15 , pick up to about 607, or so , drop about the same , etc. worse when the engine is cold. As to blow by , crankcase is vented to outside air , and , considering the miles on the engine ( 850,000) , it doesn't seem excessive. pawpaw1, Feb 3, 2013. #9.I wouldn’t drive it till sure it’s a bad sensor. You’re engine brakes require oil to work, so that’s pointing to low oil pressure. I have a friend with the CM 2250 ISX, he lost oil pressure, then found out his fuel pump disintegrated, plugging oil galleries that destroyed his engine. I hope that’s not the case with you.You just need a gauge that reads 0 to 100 psi. The manual has you take readings off of the oil cooler I believe. You'll also need a line and an adapter. Inspect the sensor though, if it's cracked and/or leaking oil definitely replace it. Oil pressure: click here. Click the link above for the information.Oct 28, 2023 · The oil pressure relief valve in a Cummins ISX engine is located at the oil pump outlet, just below the turbo where the filter housing is. Its purpose is to open when engine oil pressure reaches a certain value, allowing oil to bypass the filter and relieve excessive pressure. If the relief valve fails or becomes faulty, it can lead to various ... Oil Pressure Sensor 4921517 for Cummins Engine ISX ISM ISB QSB Part Number:4921517 Fit for Cummins Engine:ISX, ISM, B Series, C Series, ISB, QSBApplication:Fit for following models:Hyundai Forklift:180DE, 180D-7E, 250D-9, 250DE, 250D-7E Hyundai Wheel LLow oil pressure can indicate a problem with the oil pump or other engine components. Inspecting the oil pressure sensor is another important step. The sensor provides valuable information about the engine's oil pressure levels. ... Read More Cummins ISX Oil Leak Driver Side: The Ultimate Guide to Identifying and Resolving the Issue. 6.7 cummins.The oil pressure for a 6. 7 Cummins ISB is measured by an oil pressure sensor located on the outside of the engine block. The sensor is connected to a pressurized oil gallery to measure the current oil pressure produced by the engine. It is positioned in the middle of the block on the left side and is used to display oil pressure on the … Isx cummins low oil pressure, The Cummins Pressure Regulator Valve 4009956 is used primarily on Euro III 15 liter ISX/QSX engines. Specifications. Shipment Height. 1 In. Shipment Length. 4 In. Shipment Width. 3.75 In. ... Cummins Pressure Sensor. Part # 4954245. $466.27. Add to cart. Save to My Garage. ... Cummins Oil Gauge Tube. Part # 4948168. $65.66. Add to cart. Save to ..., Dec 22, 2016. #3. ajala said: Got an 06 Cummins isx, change oil n filter and now oil pressure drops to 10 psi with a cackling noise, using a different oil and filter. If it is a white filter with red writing (sorry forget the name) throw it the hell away and get a new one. We had a problem at Titan with some on our Cummins in the Pete's., The ISX changed slightly between 2012 and 2013, so it could be either model engine. These engines had fuel pump failures fairly often and in a lot of cases debris from the failure damages the oil pump. Then low oil pressure could potentially cause serious damage., The cummins manual shows a minimum pressure of 10psi at 800rpm. I have tried multiple sending units and verified the wiring to the cluster. I purchased a new oil pressure test kit from my snap on rep and put it on the top of the filter housing 1/8 npt port. When idling at 750ish rpm my engine shows 9psi and drops as low as 7psi at times randomly., When the filter is plugged, the bypass valve opens to ensure oil flow to the motor. If you have the old style valve that leaks, it causes lower pump output pressure. The new bypass valve is more properly calibrated and also seals better when closed. There are 2 sizes of plug for the new bypass valve. 16.5 mm and 19mm., This check is only done once after the keyswitch is turned ON. Possible causes of this fault code include: • Stuck in-range engine oil pressure sensor reading. • High resistance in the engine oil pressure sensor signal or return lines. Read More: SPN 558 - FMI 13 (Fault Code 432) SPN 100 - FMI 2 (Fault Code 435) B., Hello Nich sirI hhave low oil pressure issue on cummins isx 2013. Oil pressure does not go over 35 psi.Esn 79590818Replaced oil Pressure relief valve already but still issue Oil and filter was replace … read more, I checked the o ring on the oil filter it was good , hooked up a mechanical oil pressure gauge , still showed low oil pressure , pulled oil pan ck o ring on oil pump , checked good , took oil pump apart , looks like this could be the problem , sent the oil out to be tested , to much of a coincidence that the oil pump would go bad at the same time as a oil change., Mar 20, 2015. #1. Have 600 horsepower cummins 380000 miles just had oil change start the day with 40 oil pressure but during the day oil pressure kept getting a little lower finally started pulling a load up the mountain oil pressure was down to 20 and loosing power finally got to the top and the high exhaust temperature system light came on ..., Cummins ISX Air Compressor Problem Discussion in 'Trucks [ Eighteen Wheelers ] ... Any ideas or help would be greatly appreciated. By the way 2013 Kenworth T800 550HP Cummins ISX15 JDHIGGINS44, Aug 22, 2016. JDHIGGINS44, Aug 22, 2016 #1. ... Air pressure should be drained to ZERO., Cummins ISX12 350v, Took off from the light and the oil pressure light went off. Got to work and checked oil. Oil was full. At idle evic says 32psi oil pressure. When light comes on it drops to 2-1-0. Take off and about 10 seconds after taking off the light goes off and it goes back to in the 30s. I had an appointment Monday to get the truck deleted., The oil pump in a Cummins ISX engine is generally located inside the lower part of the engine, usually below and/or to one side of the crankshaft. If you notice increased engine temperature or low oil pressure, it may be time to replace the oil pump. Regular maintenance is essential to extend the life of your oil pump., Having problems with cummins isx 870, 2005. Low power, ... I've got a isx cummins engine that is losing oil pressure, drops from 40 psi to 22 psi every 7000 miles, was doing it every 10000 miles at first. If I replace the oil filter I'm good for another 7000 ..., 6k. 4. Location:Roaring Spring, PA. 1 Vehicle. Posted January 23, 2014. This issue surfaced at a Technology and Maintenance Council (TMC) meeting several years ago. Late model Cummins ISXs had an issue with oil and fuel filter plugging. They "blamed" it on the oil and fuel. Let the finger pointing begin continue., 🚗 Compatible with Cummins ISX ISM ISX11.9 ISX15 2003-2015. 🚗 Quality tested - this sensor has undergone try-on and material testing to ensure a quality fit and reliable performance. 🚗Please check pictures for more detail，check the compatibility information to verify the correct OEM part number., IMA KEEP IT REDNECK. Dec 28, 2016. #3. OK from your local diesel technician, your actuator on your vgt could be the issue. Fuel filters and air filters can also cause it. And exhaust or ege leaks. Plugged DOC or DPF. All these are options. Really hard to tell with out being connected to it and seeing whats going on in the engine., Cummins ISX12 350v, 2008 cummins isx 15 the oil pressure is dropping random, ... Hello, my name is ***** ***** have a 2010 Volvo with a ISX cummins. We are experiencing low oil pressure after engine gets to full operating temp. The laptop is showing a fluctuating pressure of about ..., Isx oil pressure low? Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Vivaspin, Dec 19 ... Oct 2, 2020 0. Hello I have an international prostar with Cummins ISX and about 900,000 miles has had in frame overhaul about 250,000 miles ago I have had this truck for the past hundred thousand miles and my oil …, The pressure can drop on a good engine to 10psi on a hot engine and it is still in the good range. This drop was the cause that Dodge put in the computer controlled guage to stop complaints about the oil pressure. You said that the pressure will drop to 20psi at idle. That is normal and a good pressure., I have Volvo truck with Cummins M11 engine. I got some low oil pressure warnings just a few days ago, both yellow and red lights. I had changed my oil pressure sensor and also the connector for the sensor but the problem is still there. What might be the reason, engine is about 300k after the overhaul, oil levels are good..., Hello, I own a 2014 KW W900 with a 2013 ISX15. Bought it two months ago and have only worked it two weeks. After the first week it started showing SPN 157 and SPN 95. First code is low fuel rail pressure and second is clogged fuel filters. Both codes turn on the check engine light with the wrench in the middle., The normal oil pressure when idling for a Cummins ISX engine is around 15-40 PSI. Low oil pressure in an ISX Cummins engine can be caused by various factors …, STEP 1A: Check the fault codes. Active or inactive counts of Fault Code 415? STEP 2: Check engine control module (ECM) calibration and clear fault codes. STEP 2A: Check if an ECM calibration If a calibration update for this update is available. fault code is available, does the ECM contain that revision or higher? STEP 2B: Disable the fault code., Technical Service Bulletin. Subject. High Pressure Fuel Pump Performance Test and New Service Tool to Assist in Troubleshooting Fault Code 559. Warranty Statement. The information in this document authorizes specific changes to the repair practice for failures covered under product warranty coverages. Contents., oil pressure sensor to see if the issue gets corrected. Aerated oil can cause intermittent oil pressure issues. Usually the o rings on the pickup tubes but I have yet to see this in a GHG17 engine. Jim Langeveld 8 posts since Feb 22, 2019 Re: DD15 - SPN 100 FMI 1 - Engine Oil Pressure Too Low Oct 28, 2020 3:44 PM Thank you Jon for your input., Dr. Cummins I have a NTC-315 that has low oil pressure. Has new oil, filters, mains, rods, camshaft bearings, checked - Answered by a verified Technician ... Good afternoon Nick Working on isx 15 Oil pressure seems low would like a second opinion Coolant temp 203 Oil temp 210Oil pressure on physical gauge 15psi at 700 rpm 26psi at 1000rpm 32psi ..., If the oil pressure gauge on your Toyota is fluctuating or not working at all, the oil pressure sending unit may be the cause of the problem. The first thing to do with any oil pre..., ISX CM871 low fuel pressure. I am working on a 08 pete with a ISX cm871 the problem i am having is it keeps setting a code for low fuel delivery pressure and fuel filter restriction. These codes are not active all the time but when they do go active the truck losses power. I have changed the fuel filters the fuel prssure sensor and the gear ..., Cummins isx has low oil pressure Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by trenten02, Jul 31, 2021. Jul 31, 2021 #1. trenten02 Bobtail Member. 8 1. Apr 21, 2011 monroe,wi 0. Have a 2010 prostar has cummins isx..truck runs fine but only has 20 to 25 psi oil pressure going down the road and 5 to 10 when truck is warmed up ..., Apr 26, 2024 · Hi everyone, I got a Cummins ISX15 that’s been having some oil pressure issues. Only thing is I haven’t actually pulled the head off and actually dug deep into it. So the problem before I took it out of the truck was that the oil temperature would rise to 235 sometimes even 245 super fast. Oil temps would get to 235 during parked regens ... , When the filter is plugged, the bypass valve opens to ensure oil flow to the motor. If you have the old style valve that leaks, it causes lower pump output pressure. The new bypass valve is more properly calibrated and also seals better when closed. There are 2 sizes of plug for the new bypass valve. 16.5 mm and 19mm.