When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Yes, that is my car. I remembered I could post a video to YouTube and then show that ink here..I have just posed a screenshot of the invoice that went with that work. The other invoices I have are for the other work and not relevant.
Originally Posted by crconsulting
Is that your car?
That sounds like tensioners. But if they did them properly that “should” have gone away.
Take a look at your invoice did they do the check valves along with tensioners?
There should be part numbers on that invoice.
What are they?
Do you see a 2780503300 or similar?
Last edited by ThatsMyDawg; Aug 30, 2021 at 01:25 PM.
Having just done my tensioners and check valves myself, I confirm the sound goes away immediately if both lobes were done. There is no wrong way to install these parts, imo.
Yes, that is my car. I remembered I could post a video to YouTube and then show that ink here..I have just posed a screenshot of the invoice that went with that work. The other invoices I have are for the other work and not relevant.
I don’t see check valves on that invoice.
Originally Posted by Baltistyle
Having just done my tensioners and check valves myself, I confirm the sound goes away immediately if both lobes were done. There is no wrong way to install these parts, imo.
Yes I agree. But as long as ALL recommended parts were installed and none were defective (rare but always a chance)
I don’t see check valves on his invoice…
There should also be a choice of two different size check valve sizes, see the Service Bulletin:
They are not on there and I do not know why MB didn’t replace them. I guess that is a question for me to ask them.
Originally Posted by crconsulting
I don’t see check valves on that invoice.
Yes I agree. But as long as ALL recommended parts were installed and none were defective (rare but always a chance)
I don’t see check valves on his invoice…
If I have found my correct engine# and searched properly then it looks like my engine is not part of the notice for repairs, although it makes the exact sound they describe in the repairs list. I may be just tired and reading the info wrong. (2:17am and I am up searching)
My engine # is 276825 30 130705 (I think)
Originally Posted by crconsulting
I don’t see check valves on that invoice.
Yes I agree. But as long as ALL recommended parts were installed and none were defective (rare but always a chance)
I don’t see check valves on his invoice…
There should also be a choice of two different size check valve sizes, see the Service Bulletin:
I understand. I meant so I could get it fixed for free. How would I prove/confirm MB checked the valves but they didn’t need replacing? It’s not noted on any paperwork.
Originally Posted by Baltistyle
My engine was not in the “official” range either. Needed them anyway, verified by opening up.
I understand. I meant so I could get it fixed for free. How would I prove/confirm MB checked the valves but they didn’t need replacing? It’s not noted on any paperwork.
Check valves are an integral part of the repair. You can’t do a full repair without replacing the check valves. They have different spring pressures which help keep oil pressure to tensioners so they function properly when cold.
There is no “testing”. Just replacement.
The repair should be two parts as described in the Service Bulletin.
Many people on mbworld have done the job, here’s a brief view. https://mbworld.org/forums/e-class-c...-rattle-3.html
there is upgrading of tensioners in cars that already had check valves installed.
there is installation of check valves in one or both sides in cars that did not have them from the factory along with new tensioners as well.
meaning a car repair sheet/ invoice does not necessarily have to include the check valves as they may have been in there making the tech think only tensioners need it. I do not imagine the valves themselves ever needing replacing. It’s a Schrader valve
I do not imagine the valves themselves ever needing replacing. It’s a Schrader valve
Ever push down on a shader valve? It has a spring. That check valve is a superseded part number. Yes, some early engines did not come with those valves at all. But even if the engine has check valves they should be replaced.
The TSB is quite clear even if it has the valves they should be replaced to the new check valves. The newer engines within the affected range that already have the upgraded tensioners, and have the older check valves installed, Mercedes only recommends replacement of the older check valve and not replacing the tensioners. Those check valves are pretty important piece of that procedure.
There’s a tool to remove and replace the check valves. $20 in parts & a few minutes to rule out oil pressure issues to tensioners vs having to rip it apart again is cheap insurance.
“Engine 2769:
1) Up to engine number 276 9xx 30 365996 install check valves and chain tensioners
2) From engine number 276 9xx 30 365997 up to engine number 276 9xx 30 406603 (February 2013) install check valves only (optimized tensioners installed in this production range) “
Last edited by crconsulting; Sep 1, 2021 at 01:03 AM.
Ever push down on a shader valve? It has a spring. That check valve is a superseded part number. Yes, some early engines did not come with those valves at all. But even if the engine has check valves they should be replaced.
The TSB is quite clear even if it has the valves they should be replaced to the new check valves. The newer engines within the affected range that already have the upgraded tensioners, and have the older check valves installed, Mercedes only recommends replacement of the older check valve and not replacing the tensioners. Those check valves are pretty important piece of that procedure.
There’s a tool to remove and replace the check valves. $20 in parts & a few minutes to rule out oil pressure issues to tensioners vs having to rip it apart again is cheap insurance.
“Engine 2769:
1) Up to engine number 276 9xx 30 365996 install check valves and chain tensioners
2) From engine number 276 9xx 30 365997 up to engine number 276 9xx 30 406603 (February 2013) install check valves only (optimized tensioners installed in this production range) “
I have not made any conclusions thus far. Everything is speculation, because I haven’t had time to have my car towed from MB to my indi yet. I have been tied up on a business project.
My service adviser returned my call yesterday, but I missed the call while in the shower. I hope to speak with him today to inquiry about why my valves weren’t done with my tensioner. I plan to also share the bulletin info that was posted in this thread that outlines my problem that others have had.
Maybe it’s me, but if you look at my engine number above in this thread and look at the engine list from MB that shows which engines should get the valves and or tensioner repair I think my engine is not in that range. Or am I reading it wrong? I have been working super long days on a business project so I could be seeing it wrong.
Also all of my tensioners weren’t replaced, so I guess in theory it could be one of the other ones that didn’t get replaced that is bad right?
Originally Posted by chassis
@ThatsMyDawg have you concluded that your engine needs check valves and tensioners?
Yeah I get it.
Service adviser still hasn't returned my call yet, but I did get a nice $300 text bill about my diagnosis fee from that dealership though. Funny how that works, when he hasn't returned my call yet. All this hassle better nt be because they did my tensioner without doing my check valves!
Non mechanic question for you or anyone. Say I do have to do this check valve, is it a whole big thing to go back in and do after the tensioner was already competed, or can you get too and replace one if not all of them easily compared to the tensioner? How much would a check valve swap cost?
Yeah I get it.
Service adviser still hasn't returned my call yet, but I did get a nice $300 text bill about my diagnosis fee from that dealership though. Funny how that works, when he hasn't returned my call yet. All this hassle better nt be because they did my tensioner without doing my check valves!
Non mechanic question for you or anyone. Say I do have to do this check valve, is it a whole big thing to go back in and do after the tensioner was already competed, or can you get too and replace one if not all of them easily compared to the tensioner? How much would a check valve swap cost?
Honestly, they could have just have easily done the full install and not billed you for it. Or perhaps they have a record it’s been done in the Service History /VMI. And since your engine is outside the range maybe they decided to take the short cut.
I would ask a lot of questions…
Also easy to park the car in a warmer garage to see if it has any effect. (free) and put an oil pressure gauge to see pressure and how long it takes to get oil to the top end. (cheap). I definitely would be hesitant to throw more $$$$ at the problem without clear direction.
There is some very sage advice in Baltistyle three rules and post
Originally Posted by Baltistyle
Research your state laws for return if you ever get stuck in this situation. Time is of the essence
Good Luck let us know how it turns out.
Last edited by crconsulting; Sep 1, 2021 at 08:59 PM.
I have not made any conclusions thus far. Everything is speculation, because I haven’t had time to have my car towed from MB to my indi yet. I have been tied up on a business project.
My service adviser returned my call yesterday, but I missed the call while in the shower. I hope to speak with him today to inquiry about why my valves weren’t done with my tensioner. I plan to also share the bulletin info that was posted in this thread that outlines my problem that others have had.
Maybe it’s me, but if you look at my engine number above in this thread and look at the engine list from MB that shows which engines should get the valves and or tensioner repair I think my engine is not in that range. Or am I reading it wrong? I have been working super long days on a business project so I could be seeing it wrong.
Also all of my tensioners weren’t replaced, so I guess in theory it could be one of the other ones that didn’t get replaced that is bad right?
@ThatsMyDawg Your engine is in the affected range, see line item numbered 1) .
Your engine number is #130705. Engines from #0 to #365996 require check valves and tensioners. Your engine requires check valves and tensioners.
It seems to be difficult for you (not a criticism) to get information on whether or not check valves AND tensioners are installed in your engine. If they are installed, all of them, your problem lies somewhere else, or the valves or tensioners have failed. Rare but it's possible. If they are not installed, you need them installed.
Quotes from earlier posts: From ThatsMyDawg: Good info. My engine # is 276825 30 130705
from crconsulting “Engine 2769:
1) Up to engine number 276 9xx 30 365996 install check valves and chain tensioners
2) From engine number 276 9xx 30 365997 up to engine number 276 9xx 30 406603 (February 2013) install check valves only (optimized tensioners installed in this production range) “
Yeah I get it.
Service adviser still hasn't returned my call yet, but I did get a nice $300 text bill about my diagnosis fee from that dealership though. Funny how that works, when he hasn't returned my call yet. All this hassle better nt be because they did my tensioner without doing my check valves!
Non mechanic question for you or anyone. Say I do have to do this check valve, is it a whole big thing to go back in and do after the tensioner was already competed, or can you get too and replace one if not all of them easily compared to the tensioner? How much would a check valve swap cost?
Thanks as always...
@ThatsMyDawg This whole topic is a fair amount of work. You can use the search feature to see if anyone on this site has posted their experience with cost or labor hours. My guess is around 8 hours, so at $200/yr roughly $1,600 in labor plus parts of a few hundred. So roughly $2,500 for check valves and tensioners. I am shooting from the hip on this and giving a rough estimate. It's not a 1 hour job, and it's not a 1 week job. It's a day or two job.
I agree with you and did not take it as a critique. It is hard for me because I have to wait for people to return my calls. Outside of that all I have is my I invoice that says one (1) tensioner was installed with no check valves. My service manager replied to my email today after we have been playing phone tag for days. I am scheduled to speak with him tomorrow. I will ask every question I can think of as well as everyone those in this thread have suggested. Oh snap! I do have my VMI. I remember that I got it from MB later after my purchase. Let me review that again tonight and see if anything like this work needed is on it.
EDIT----->>>> Nothing on VMI that shows any prior tensioner/check valve work.
Originally Posted by chassis
@ThatsMyDawg Your engine is in the affected range, see line item numbered 1) .
Your engine number is #130705. Engines from #0 to #365996 require check valves and tensioners. Your engine requires check valves and tensioners.
It seems to be difficult for you (not a criticism) to get information on whether or not check valves AND tensioners are installed in your engine. If they are installed, all of them, your problem lies somewhere else, or the valves or tensioners have failed. Rare but it's possible. If they are not installed, you need them installed.
Quotes from earlier posts: From ThatsMyDawg: Good info. My engine # is 276825 30 130705
from crconsulting “Engine 2769:
1) Up to engine number 276 9xx 30 365996 install check valves and chain tensioners
2) From engine number 276 9xx 30 365997 up to engine number 276 9xx 30 406603 (February 2013) install check valves only (optimized tensioners installed in this production range) “
Last edited by ThatsMyDawg; Sep 2, 2021 at 06:35 AM.
That is what I was looking for, ballpark costs. I know what a tensioner costs, because I have that invoice. I was trying to understand if it is the same amount of work to do check valves as it is to do tensioner work. Since I had a tensioner completed I thought it may be far less to do the valve (time and cost) because of the tensioner already being done, or if it is the same either way because of what you have to do to get to the valves might be the same as it is to get to the tensioner. I will search...
Originally Posted by chassis
@ThatsMyDawg This whole topic is a fair amount of work. You can use the search feature to see if anyone on this site has posted their experience with cost or labor hours. My guess is around 8 hours, so at $200/yr roughly $1,600 in labor plus parts of a few hundred. So roughly $2,500 for check valves and tensioners. I am shooting from the hip on this and giving a rough estimate. It's not a 1 hour job, and it's not a 1 week job. It's a day or two job.
Boy I sure don't get this. OP has a rattle / knocking noise during start-up. Dealer replaces tensioners. Noise is still there. The best guess for the fix is that the tensioners need to be replaced. If true the dealer is utterly incompetent.
Well, I spoke with the service person and presented him with my findings and questions. Via phone he said “It does appear that MB wanted the check valves done with the tensioners to fix your issue, but it looks like we did not do the valves. Your engine is listed as one of those to do the valves.”
”let us research this to make sure that is correct and we have everything in order, give me until Tuesday to get back with you”
Originally Posted by MBNUT1
Boy I sure don't get this. OP has a rattle / knocking noise during start-up. Dealer replaces tensioners. Noise is still there. The best guess for the fix is that the tensioners need to be replaced. If true the dealer is utterly incompetent.
Well, I spoke with the service person and presented him with my findings and questions. Via phone he said “It does appear that MB wanted the check valves done with the tensioners to fix your issue, but it looks like we did not do the valves. Your engine is listed as one of those to do the valves.”
”let us research this to make sure that is correct and we have everything in order, give me until Tuesday to get back with you”
Very Lame…
As suspected, it doesn’t appear as though they did the check valves when they did the tensioners 🙁
Does the VMI show they were done at any time?
and btw they did do both tensioners. Both part #’s are present on your invoice.
Originally Posted by MBNUT1
Boy I sure don't get this. OP has a rattle / knocking noise during start-up. Dealer replaces tensioners. Noise is still there. The best guess for the fix is that the tensioners need to be replaced. If true the dealer is utterly incompetent.
Tensioners are 50% of the proper repair, especially if his engine # falls into affected range.
It may need both tensioners and check valves.
Last edited by crconsulting; Sep 2, 2021 at 05:56 PM.
The VMI does not show any prior work on the subject. The VMI shows steady and regular dealer visits for mostly small service visits.
Correct, my service rep confirmed to me today that they did not do the valves with my tensioners service. What he couldn’t explain is why they were not done. He also confirmed that both tensioners were replaced and pointed out to me that they have two different part numbers on my receipt.
He also confirmed that my engine does fall into the affected range, but mentioned that he didn’t even see a part number for the valves in whatever system is was looking in.
Originally Posted by crconsulting
Very Lame…
As suspected, it doesn’t appear as though they did the check valves when they did the tensioners 🙁
Does the VMI show they were done at any time?
and btw they did do both tensioners. Both part #’s are present on your invoice.
Tensioners are 50% of the proper repair, especially if his engine # falls into affected range.
It may need both tensioners and check valves.
Last edited by ThatsMyDawg; Sep 2, 2021 at 08:05 PM.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
