Oil pan replacement

[rdezs]

There's a whole range of opinions on that pressure relief valve in the oil pan. Many people just plug it off. Considering you have a pressure relief built into the oil pump, it does provide a redundant method of pressure relief. I personally suspect it has more to do with high RPM pressures.... I would suspect the component most at risk from extremely high oil pressure, such as running at 4,500 RPM+with cold oil would be the o-rings under the VLOM plate. Perhaps the oil filter itself as well. If you do a full delete including the VVT, normally you install a standard pressure oil pump and just plug the thing off. (The VVT actually requires the higher volume oil pump more than the AFM DOD system.) In either case, in the quest to locate oil pressure loss and going for the pickup tube o-ring, this valve is often overlooked.

 

[donjetman]

My engine didn't come with AFM/DOD but I installed GM relief valve deflector# 12639759 per this TSB: https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf
zero oil pressure and consumption issue(s) since then (2018)

 

[rdezs]

Your engine didn't come with AFM, but it came with the valve in the oil pan? I'm assuming them that you have VVT?

 

[rdezs]

Couple months back I was reading that the valve is specifically for the protection of the AFM lifter solenoids. Apparently at around 65 PSI oil pressure they will fail. So if you don't have AFM or have it turned off, the valve can be removed and plugged off. Technically though, it probably doesn't matter as it releases pressure far above with the oil pump releases at .... But, it is one more thing to fail I suppose. I've read numerous times of people with a non-afm engine finding the valve in the oil pan.... Most people chalk it up to GM using the same pan on multiple versions of the LS engine.

 

[donjetman]

Your engine didn't come with AFM, but it came with the valve in the oil pan? I'm assuming them that you have VVT?

VVT yes

 

[donjetman]

AFM valve w/deflector

 

[petethepug]

Gawd I love TSB’s. They’re written in plain English and pictures. Pictures with arrows and circles!!

I always felt like the guy below when I walked up to a cocky service manager with a TSB in hand.

 

[novemberr]

.... And if you have not deleted the AFM/DOD, replace the pressure relief valve in the oil pan. Those wear out also, and cause a loss of oil pressure.

If AFM was disabled, does the valve still need to be replaced? Thanks.

 

[rdezs]

If AFM is disabled I would remove and plug it with a threaded bolt, copper washer. It only exists to protect the AFM solenoids in case the oil pressure spikes above 65 PSI. (Which kills those AFM solenoids)

 

[rdezs]

The bolt and washer is like $16 on Amazon. Convenient I suppose. No doubt you could get it cheaper at a hardware store. 14x1.5 mm. Match the length of the threads to the relief valve removed.

Michigan Motorsports LS Oil Pan Oil Pressure Relief Valve Plug for 2007+ LS3 L99 L96 L92 LMG LC9 L77 L76 LH6 4.8L 5.3L 6.0L 6.2L Bypass https://a.co/d/gk4HROM