Nothing at over 10000 miles.

Sent from my SM-G973U using Tapatalk

 

That's good to hear.. Hope they get mine straight.

 

There’s another thread about this. Sounds like an improperly installed seal in that case.

 

Seal failure at 300 miles sounds very much like a manufacturing/part installation issue. Hopefully the service tech checks endplay and runout on the crank when they pull the engine. I've seen toasted rear main bearings cause seal leaks.

Hopefully it was just installed wrong and can be resolved quickly.

 

2020 AT4 with about 13,000 miles. Rear main seal went out on me last night. They will be tearing it down this week.

 

2020 RST 13k massive oil leak yesterday...towed to the dealership to diagnose. What is the updated situation on your truck?

 

Here I am... 15600 miles on my GMC SIERRA 1500 with duramax 3.0.
Few days ago noticed a fresh oil spills on driveway. Came to the dealer. It’s took 4! FOUR!! days to diagnose a problem. Oil leak from turbocharger. Of course no parts. No diesel mechanics with this engine abilities. Now i have to wait at least 3 weeks, to get it fixed. Really disappointed.

 

lol drive by spam

 

I have a 2020 SILVERADO RST 1500 with 3.0 Duramax 10,00 miles and pulled into parking spot and noticed a trail of oil behind me!!!! had towed into dealer where i purchased it although they were out of loaners to keep me content they pulled a 2021 Silverado off the lot 12 miles on it!! for me to use while mine is being fixed!!!, So I feel good about that but I WANT MY TRUCK BACK!!!! also it's very concerning to me that in JUNE myself and my two Adopted boy's 6 and 9 will be going back east on a 6 week sight seeing vacation pulling a trailer. Also being a 40 year ASE Master Tech I am watching as to what they are doing and there explanations they are giving me!!! I find it a little odd they say there are no tech bulletins on this!!!

 

I'm reluctant to buy first or second year of any new engine platform, I'm surprised you did as a 40 year master tech lol

 

I have a thread here about this issue. My 2020 Silverado RST 3.0 Duramax lost its oil a few weeks ago, the found that it was the rear main seal. I picked it up after repair on a Friday and it blew the seal again the following Thursday. I am supposed to pick it up tomorrow. GM corporate says if the same thing breaks 3 times, they will do a buyback. I expect it to happen again...

 

I have the same year with problem in front seal. Replaced three times and still leaks. Dealership says they are out of solutions and have contacted GM service. Wondering if they buy back is it at present value because to trade for same truck it will cost me $30-36K.

 

Oh this is not good.
I bought my wife a lm2 Silverado last month. it was a 20 left over. With a hundred miles. now has 3000 and I see leaking all over my driveway and garage looks like it's been doing it for a couple thousand miles now trucks going in next week.hoping it's not the rear main seal...How long is this repair usually take?

 

I have a 2020 GMC Sierra Elevation and my 3.0 Duramax blew the rear main seal at 5,000 miles leaving a huge puddle of oil in my garage and all over my driveway. Spent a week and a half in the shop. I got it back 4 days ago and tonight noticed another huge puddle of oil under the truck and a huge trail of oil on my driveway. Where do I go from here? So frustrated.

 

Beginning to sound like GM will be replacing engines if this is a common occurrence and they can’t figure out why it’s happening.

Has any dealer stated why the seals are failing? Is it the seal itself or is it the engines machined bore (oversized, perhaps) that is causing them to fail? What oil pressures were seen prior to the seals failing? I know I saw 58-59 psi when passing uphill while towing a couple of days ago.

 

Or installation / assembly issue...

 

To follow up, I got my Silverado 3.0 Duramax back today. Dealer fixed rear rear main seal and replaced bell housing this time. We shall see how long this lasts...

 

Hi all, I have a new (I have had it 7 days) AT4 3.0 w/ a rear main seal failure at 300 miles. Had the truck 7 days. At dealer now for extensive dismantling and repairs.
Anyone else have leaks very early on with this engine? I am worried about a defect in the block machining where that seal fits

Just blow the rear main seal just over 10,000 miles

 

See new post today about correct procedure to install oil seal while attached to rear plate, as published in GMTECHLiNK article.

 

Just had my 2020 Elevation towed to the dealer today. 8700 Miles, blown rear seal. Oil all over the driveway.

 

Same here 2020 Sierra 4x4 Turbo Duramax oil all over the driveway.

 

Ive had mine almost a week and about 450 miles, knock on wood, no leaks yet

 

Copy of article attached. Perhaps not all the techs have seen this.

 

Same thing has happened to me twice! Its in the shop now; I have just over 7000 miles on it 2020 Sierra Denali Duramax

 

There are a number of complaints/reasons for the Rear Seal failures some are as follows....



1.Plugged pcv orifice causing rear seal oil leak
2Catch Can Install
3.Lifted Truck/Oversized Tires/
4.Improper Seal Install From The Manufacturer
5 Poor Transfer case Machining




There are some very well versed individuals on this forum so ..Im curious does anyone have any suggestions as to why. And why so many issues in such a short span of time..

GM says the PVC causes most failures. It appears the transfer case fluids expand and cause the seal to “leak then blow out”

But after the seal is replaced by a dealer the seal failure never returns..

I have my theory as to why in most cases( not all) the seals fail..

These seals must be kept flexible and the oil is the most important component.

Please see the following

Is it the rear main seal that is leaking?

It might not be. On most engines, oil leaks can occur above and below the rear main seal. It could be a leaking oil pressure sensor, oil pan gasket or galley plug near the seal that causes oil to come from the bell housing. Adding dye to the oil can help reveal where the oil is coming from.
Is the PCV system clogged or blocked?


Most rear main seals have a lip that rides on the shaft. The pressure inside the crankcase will push the lip onto the shaft. Too much pressure will eventually cause the lip to balloon and allow oil to pass. If the Positive Crankcase Ventilation (PCV) system is blocked, it will increase the pressures inside the crankshaft and push out the seal. Also, if the engine is supercharged or turbocharged, excessive blowby due to worn or damaged piston rings can cause increased crankcase pressure that can also damage the rear main seal.

What is the condition of the oil?

Most oils have chemicals in their additive packages that will condition the seals in the engine. If the oil is not changed regularly, it will cause the seal to degrade. The seal conditions are depleted over time along with buffers in the oil. The lip that rides on the crankshaft will become stiff and will not be able to seal itself against the crankshaft.

What is the condition of the crankshaft?

The condition of the surfaces that the rear main seal rides on is critical. Any imperfections or wear on the crankshaft can cause a leak. There are sleeve kits that can be installed on the crankshaft to restore the surface.

Did you follow the directions that came with the seal?

Some rear main seals need to be installed dry. These seals have a polytetrafluoroethylene (PTFE) coating on the lip seal that needs to be dry and seat to a dry surface on the crankshaft. The seal will transfer a layer of PTFE to the crankshaft surfaces that the lip will ride on. The transfer layer prevents wear while sealing better than a silicone or Viton material. If the seal is installed with a coating of oil, it will start to leak in a few miles.



I believe that there is a distinct relationship to the quality of the oil..Outside temps



And how long have these NEW trucks been setting..Have the seals become dry and are destined to fail..



Any thoughts

 

Not sue what the transfer case has to do with it since there transmission between the engine and transfer case.

 

Hope this helps


As a senior tech quotes


"The transfer case output shaft seal is located on the transfer case of four-wheel drive cars, trucks, and SUVs. The transfer case completes the activation between two-wheel drive neutral, to low four-wheel, and then to drive four-wheel. Inside the case are a series of gear reductions and chain drives that work together to accomplish their task of supplying power to the drive axles, making the vehicle four wheel drive.


The transfer case output shaft is the part that connects the case to the axle. The purpose of the transfer case output seal is to prevent fluid from leaking out of transmission, where the transfer case is connected by way of the transmission's input shaft. The seal also helps to keep fluid from leaking out of the front and rear output shaft to the differentials, which keeps all metal components properly lubricated for extended use.


If the seals leak, fluid escapes and is no longer able to properly lubricate the interior components of the transfer case. Eventually the parts inside will wear out and overheat. If this happens, the transfer case will be rendered useless and the four-wheel drive operation will not work. Over time the transfer case output shaft seal can fail, and when it does, will display a few symptoms that will alert the driver that a problem with this system exists. .

 

I know what the transfer case does but what does the transfer case have to do with a rear main seal leak on the engine. That was my point!!!! -> NOTHING TO DO WITH IT
That "engineer or tech" needs to go back to school.

 

As posted by above by Ron, the 3.0 has the timing cover on the back of the engine, and the seal is in that cover.

Depending on what is found, the repair may require replacement of the cover as well....

Diesel Engine Rear Main Oil Seal – TechLink

gm-techlink.com

Diesel Engine Rear Main Oil Seal
April 13, 2021
Some 2020-2021 Silverado, Sierra; 2021 Tahoe, Suburban, Yukon and Escalade models equipped with the 3.0L diesel engine (RPO LM2) may have an oil leak concern and DTC P06DD (Engine Oil Pressure Control Valve Performance) may be set. These conditions may occur if the rear main oil seal has moved or is severely shifted out of position in the timing chain lower cover.
If these conditions are found, replace the timing chain lower cover, which comes with a seal already installed. (Fig. 9)

Fig. 9

If the seal is tilted out of position, use a caliper and record the depth where the seal is pushed in prior to removing the rear cover. Also place an indexing mark on the seal and cover, which will be helpful to the Warranty Parts Center in case the seal falls out or moves during shipping. (Fig. 10)

Fig. 10

Record the Part Unique Number (PUN) found on the white label attached to the back of the cover.
The timing chain lower cover comes with a two-piece protector/installer. The inner piece becomes the installation tool. (Fig 11, A) The outer piece simply holds them together for shipment. Remove and discard the outer piece. (Fig. 11, B)

Fig. 11

The inner piece acts as an installation tool substitute for the EN-52466-2 seal protector and fits over the bevel on the end of the crankshaft. Be sure that the inner lip of the seal slides over the rear of the crankshaft without rolling during installation or a repeat oil leak may occur. The protector/installer (Fig. 12, shown without cover) will have a snug fit to the pilot of the crankshaft.

Fig. 12

 

Consequently, Almost 90% of all rear main seal oil leak complaints, were actually leaks in the pan gasket, rocker covers, side covers, etc., and are not leaking rear main oil seals.

Rear Main Seal Leak



Good To know..Just trying to determine actual causes

 

my new AT4 2021 seal crank oil leak at 12,000 kilometers very disappointed I go back to 6.2l