Ideas on what else to replace while doing oil pan gasket

[McLeod Crouch]

Im changing my oil pan gasket this week, and was just wondering if there was anything else i should replace while i’m down there with everything torn apart. I am also doing the motor mount. Its a 07 4x4 and 5.3 with 179k miles.

 

[swathdiver]

Im changing my oil pan gasket this week, and was just wondering if there was anything else i should replace while i’m down there with everything torn apart. I am also doing the motor mount. Its a 07 4x4 and 5.3 with 179k miles.

Change the oil pump pick up tube o-ring. Consider blocking off or replacing the bypass valve in the oil pan. If yours has an external engine oil cooler, check the lines and block right above the oil filter and consider replacing that too.

We did ours today, dropping the diff down, loosening the bolts so it hung lower, helped run the lines out the back and then install the new ones the same way, from underneath. Since the wheel well liner is out as well as the struts and control arms, we'll pull the engine mount through there and not remove the steering shaft. Still pondering how to jack the motor, no cherry picker and differential blocks the tab on the block.

 

[donjetman]

Change the oil pump pick up tube o-ring, on my 6.2 it was Felpro 72401 or GM 12584922 - $9, also install AFM Deflector – gm#12639759 - $8.

 

[wsteele]

I would install the AFM pressure relief valve deflector as described in the service bulletin below if had not been done previously.

https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf.

Edit: Oops, Don was quicker on the draw..

 

[iamdub]

+1 for pickup tube O-ring and deflector.

You can't block off the pressure release valve unless you're disabling or deleting AFM.

 

[HD_LS]

+1 for pickup tube O-ring and deflector.

You can't block off the pressure release valve unless you're disabling or deleting AFM.

Good info. Do you have any more details about this. OK with AFM activation disabled, but AFM hardware still in the engine?

 

[iamdub]

Good info. Do you have any more details about this. OK with AFM activation disabled, but AFM hardware still in the engine?

That pressure release valve in the oil pan is a vent for when the AFM system activates and purges the pressurized oil from the lifters to collapse them. If it were plugged and AFM still activated, the lifters wouldn't be able to collapse when the PCM commands, resulting in misfires on four cylinders and maybe a spike in pressure elsewhere in the oil system the first time it deactivated. This could possibly damage components and/or seals. If the AFM system is non-operational (either still in place and disabled or completely deleted), then the valve isn't used and it'd essentially act as a secondary pressure regulator to the one built into the oil pump. I replaced mine with an M14-1.5 oil plug.

https://www.tahoeyukonforum.com/threads/growing-up-doesnt-have-to-suck.93510/page-55#post-1427085

 

[petethepug]

Motor mounts are like shocks, you replace all of them or it doesn’t make sense. In the case of the motor/trans mounts though, the unchanged mount will immediately be allowing the new mount to wear out at the rate the other mount(s) has failed.

The pan gasket is something you’d replace if you were doing the rear main seal. The accessibility would be there. Obviously you don’t need to do that, but others may be there right now.




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[HD_LS]

That pressure release valve in the oil pan is a vent for when the AFM system activates and purges the pressurized oil from the lifters to collapse them. If it were plugged and AFM still activated, the lifters wouldn't be able to collapse when the PCM commands, resulting in misfires on four cylinders and maybe a spike in pressure elsewhere in the oil system the first time it deactivated. This could possibly damage components and/or seals. If the AFM system is non-operational (either still in place and disabled or completely deleted), then the valve isn't used and it'd essentially act as a secondary pressure regulator to the one built into the oil pump. I replaced mine with an M14-1.5 oil plug.

https://www.tahoeyukonforum.com/threads/growing-up-doesnt-have-to-suck.93510/page-55#post-1427085

Thanks!

 

[McLeod Crouch]

Sooo i shouldn't do afm deflector