You have to take it to the Mercedes-Benz dealer and they will diagnose the vehicle and if they verify that this is your issue. They will give you an estimate if your car is out of warranty, but if it's still under 5 years or 40,000 miles or additional CPO warranty they will repair at no charge.

Thank you!

This one came with the valves. The only thing you have to swapped are the rocker arms.

Good luck

Crank pulley at OT and cam sensors remove you can see through the holes on 1 side an u shape on other side a line metal mark.

No unless you bought a service package.

@@nelynel83 thanks! Are my23 cylinder head fault free right now?

No

Hello, and yeah it could be related to the valves but without knowing codes and actual values it's hard to say exactly

Also is timing tool needed?

Yes, start from the middle and work your way towards the outside left and right

No timing tool needed. Just set the crank to OT and take cam sensors out to see that intake has a the timing mark facing up, the exhaust will have mark looking like a U

Is it 80nm

@@anees7988 no 1st stage 10nm, 2nd 40nm, 3rd 90 degree turn, 4th 90 degree turn, 5th another 90 degree turn.

Yes, this vehicle will eventually have this problem. As long as the car is under the warranty, which is 4 years, 50,000 miles, which ever comes 1st. It will be 100% cover.

@@nelynel83 Believe it or not, he has only 10K miles on it. One more year for the factory warranty. When will this type of issue start happening? Please advise. Some comments below say the warranty is extended to 15 years/150k miles to cover this issue. True?

Yeah, sorry, there's no telling when this will occur.

Yes same problems

Experience lol

Mercedes-Benz requires high experience as stated above! Or just put baggies and label with sharpie lol

You should be covered

warranty is exteneded 15yrs/150k miles to cover this issue. they should fix it under warranty

@@tman984 Correct. I just got the same letter from Mercedes informing the warranty has been extended to what you stated

@@robsan9017when did yall get this letter I had to replace my cylinder head and pay out of pocket.

@@tman984how did you know this I have not received any info on this

Yes, the new cylinder head comes with the gasket inside the box.

@@nelynel83 only gasket or include other parts ?

Well, sometimes the cylinder head comes with the intake, exhaust valves and valve stem seals in it and head gasket. But sometimes the cylinder head comes naked just the block. I guess it depends on the model. Ask before you order it.

Yes most likely, with 31,000 miles. That's crazy right.

@@nelynel83 crazy indeed, made me very disappointed in MB. I purchased this make because of their durability especially with engines. I read that you said once it is changed it is all good, so that’s a relief. What causes this problem? Which part is defective? Also, y r the GLB so jerky when stopping and driving? Thanks mate!

Mainly the valves, intake /exhaust valves. But meecedes so far is changing the complete cylinder head. And about the jerking, if you're talking about while braking, that would be the brake rotors been warped/ burn causes pulsation. If your talking about talking off and while driving that could be the rear differential, we been changing them for this issue also.

@@nelynel83 Nope not while breaking. Like when coming to a slow "almost" stop and then pressing on gas, it like jerks instead of a smooth acceleration. Is that rear differentials as well?

@Daiiisssy yes sounds like rear differential, you will hear a thunp as it gets worse,

No

Oh really! The issues are the valves. So if the valves are replaced and sealing properly on the cylinder head I think it should be good. Thanks for the info!

But still, regarding the Mercedes-Benz TSB LI01.30-P-072328 addressing the issue, it states, 'Check engine light illuminated. Engine runs rough. Poor shifting or jerking when accelerating. Fault codes stored related to mixture formation or injector quantity adjustment. Misfire faults may also be present. Leaking valve seat in the cylinder head. Perform a cylinder leakage check as noted in WIS group 01.00. If excessive leakage is found, determine if the leak is from intake or exhaust valves. If leakage is found from intake or exhaust valves, remove the cylinder head and inspect valve seats. The complete cylinder head must be replaced if valve seat damage is found. The valve seats cannot be reworked.' So, I guess the proper way to fix this is by changing the cylinder head.@@nelynel83

I am the workshop! I am the Mercedes-Benz technician! If you have the same problem, yes, you should!

I mean , the same head I have can’t be fixed without replacing?

Can it be fixed?

@mohamadismail9142 you can try replacing all the valves.

Please one more quick question How did you remove the tensioner holders ? The two parts that holds the tensioner

Yeah I hear you. This happen mostly within 10k miles to 40k miles which would still be cover under the warranty. Once is done you don't have to worry about it. They made the parts better. This is why you don't buy the 1st or 2nd year of that model. Wait at least for the 3rd year.

So its a 1 time fix? Any word on if the 2023's have fixed the issue?

@@nelynel83 Unfortunately I just limped back to the Mercedes dealership this morning for my 2020 GLB 250's second head replacement @ 40,367 miles on it. The first failure happened at just over 15,000 miles on it. 😳

How much did it cost

This job at the dealer roughly $7k

Yes they been bad! And I thought the M271 was the worst. But at least the M271 lasted about 90,000 miles until they bent intake and exhaust valve and gears.

@@nelynel83 How many have you replaced?

I'm done 6 on the M260.

@@nelynel83 My aunt had hers replaced last month right outside of warranty on a 2020 GLB250.

No way....how much she pay for that if you know....she should contact and complain with Mercedes-Benz

Lol I hear you