The engine is running on only four cylinders. It's ribbed with solenoids on the underside. The AFM oil pressure relief valve regulates the oil supplied to the VLOM and is located in the oil pan near the oil filter housing. In four-cylinder mode, they act like air springs and allow for smooth operation. The collapsed lifters will not engage the pushrods and both valves remain closed. 3- Knocking, check engine (emissions warning), Service ECS, parking brake. Moreover, the oil capacity was also increased in engines after 2014 to improve lubrication. Excess oil will be pushed out of the pressure relief valve into the oil pan. 5.3 afm oil pressure relief valve location snowrunner. So you're welcome to conduct the other tests that are normally used to assess internal engine wear, like cylinder compression and leakdown, but I'm pretty sure the cause of your customer's low oil pressure can be diagnosed and corrected without the need for major engine work. We have noticed an increase in the issues surrounding the replacement of deactivation lifters in GM LS engines with Active Fuel Management or AFM. AFM is good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. This method is costly but saves the engine from further damage. Product Description. Lol I just found that bulletin on the Alldata at the shop yesterday.
Reassembly is the reverse of disassembly, as the old repair manual saying goes. This valve is used to bypass excess oil pumped by the high-volume oil pump when Active Fuel Management and Variable Valve Timing are not active. The oil pump has a metal pickup tube attached to it, on the side of the pump opposite the relief valve. We pulled the engine. In addition, it has been reported that it is common to find the VLOM oil filter plugged and needing replacement on high mileage engines with miss-fire fault codes. GM/Chevy Engines Factory-Equipped with AFM. He told me about it, and showed me the oil pan and there was cam bearing material everywhere. AMS Racing Oil Bypass Plug Kit for Chevrolet GM Gen IV 5.3L 6.2L LS Tr –. You will find the AFM relief valve (1) on the oil pan as shown in the figure below: Install this AFM shield on the relief valve and tighten the oil pan with a torque wrench by applying a torque 28N-m. With this deflector, all the oil spray coming out of the AFM relief valve will be deflected back to the oil pan. NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades.
I believe their bypass is in the top of the oil filter tube transfer assy. How Active Fuel Management (AFM) Works. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters. AFM engines use special lifters for cylinders 1, 4, 6, and 7. All AFM/DOD engines use a low pressure oil pump. I would highly recommend you read that guide first before proceeding further. • A valve stuck closed will result in excessive oil pressure. 8; 11-20-2013 at 08:42 PM. • Often when the pressure relief valve sticks closed, severe damage to the oil filter is the result. At low engine speeds the low side of the operating range will depend on the engines ability to produce oil pressure using the flow of oil from the oil pump. He said it was cranking smooth and looked good before he put it in. 5.3 afm oil pressure relief valve location and replacement. Engines with AFM use a high-volume oil pump. You can consult this pdf to learn more.
I would match the necessity of the oil pan mounted relief valve to the oil pump you are using. Everything is now back together, and honestly runs great. Internal engine sludge. Oil pump pressure relief valves can fail in either the open or closed position. I wouldnt think it'd be for the oil filter cause that has its own relief, but maybe its for the lines, in the event the cooler gets clogged or the line gets pinched maybe. In addition the VLOM oil filter must be replaced as well. One user says this: "6, 272 miles on my 2021 Trail Boss and it's in with a failed lifter right now. Improved Racing LS Oil Pan Pressure Relief Valve Plug Kit. You'll have to remove the front cover, and you'll have to use some small tools along with your wrenches, but it is possible. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. • Rotor: A rotor-type pump uses a lobe-shaped gear and rotor inside a housing.
Of course, it can still fail but it's much more dependable than it used to be. In 2011, GMC introduced a new valve/rocker cover design for the driver side in which the PCV drain hole has been relocated to prevent oil from entering the intake manifold. Having low oil pressure after AFM delete in a 5.3 LH6. VLOM applies pressurized oil to the AFM lifters when cylinder deactivation is requested, and shuts off that supply of oil to reactivate those cylinders. Maybe re-read your proof because you aren't understanding it lol.
Look for the following: 1. The debris in the oil can restrict the movement of the pressure regulating valve in the oil pump, causing it to stick. With the bolt removed from the pump, remove the oil pump from the front of the crankshaft. 5.3 afm oil pressure relief valve location gite. All Gen IV engine blocks have AFM towers and oil passages cast in. My tech seems to think its the oil pump. Certain LS-based vehicles feature an M14x1. We have found that most lifter faults are caused by oil pressure issues, or control issues.
Which Option is Best—a Disabler or Delete Kit? Decided to do an AFM delete and have a tech I know who works at a Chevy dealership do the work for me. Another user says this: "2020 Silverado 5. 844, and the deactivation lifters require 22 PSI of pressure to release the locking pins. Active Fuel Management AFM Roller Lifters for 2007-2019 GM 5. 10 Second Truck Club. Symptoms of a low oil pressure condition have become a common complaint on GM vehicles equipped with active fuel management, sometimes referred to as displacement on demand. Even changed the sensor, didn't do anything. Recently Browsing 0 members.
If an AFM lifter is mechanically collapsed or stuck, low compression will be found on that cylinder during an AFM compression test. From what I've researched, I think the most likely cause is either the oil pan o-ring, or some stuck debris in the inlet, screen or something. The lifters return to normal operation. The pressure readings should respond to changes in throttle position. OEM GM Oil Pan #12640748.
Splinter and Preston have pretty well answer your question but I thought it may be worth mentioning that valve has been known to spray so much oil on the cylinder 7 walls it can actually gunk up the piston rings and drop compression. The procedure illustrated is an accurate means of identifying the cause of a low oil pressure reading, preventing the replacement of some unnecessary parts and reducing the diagnostic time. If there is an excessive drone-type noise from the exhaust of the GMC engine when in V4 mode, you should perform an exhaust leak test. Here's where it gets interesting, and where your creativity may come to bear. Had another tech delete the AFM codes in the ecm and he also did some things for throttle response and fuel delivery. The pumps already have reliefs so no need for a second. AFM lifter is an important mechanical component that should smoothly work in AFM engines.
NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. It was found that during the assembly of Chevy vehicles after 2019, a batch of bad lifters was used. When dealing with low oil pressure in GM engines with AFM, you should look at the following key areas of the oil pump: - A restricted inlet screen on the pick-up tube in the oil pan is blocking the oil flow.
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