Concerns for undrilled lubrication holes in NEW OEM Camshafts
Make sure to check those new camshafts before installation:
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WOW...
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That’s insane.
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That’s crazy. What’s the fix? Remove valve covers and start drilling holes?
After seeing this I’ll have an even harder time believing that car manufacturers don’t build their product to eventually fail on purpose. |
Originally Posted by BLKROKT
(Post 7703407)
That’s crazy. What’s the fix? Remove valve covers and start drilling holes?
After seeing this I’ll have an even harder time believing that car manufacturers don’t build their product to eventually fail on purpose. |
Anyone care to explain please for those of us less mechanically inclined?
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Originally Posted by NotABaller
(Post 7703572)
Anyone care to explaTin please for those of us less mechanically inclined?
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Originally Posted by Jasonoff
(Post 7703599)
The inside of the cam is hollow for oil to pass through. Those little holes are there so oil can lubricate the bearing. If the hole is not drilled far enough, no oil will come through to the bearing.
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It's not really a design flaw as the head bolts were.
I would bet my money on that the bit which drilled the holes was damaged and partially broken off and didn't drill the hole deep enough. If they don't do a flow check and that info isn't traced with the 2D barcode then good luck finding the bookends. That is just going to be blown off by the manufacturer. Worst case they have to implement a poke yoke in their production step. At best they will recall the cars if the can find the bookends. Most likely the camshaft he used are made as a service part by the manufacturer. Which is a non standard set up for them and stuff like that happens all the time. In that case the original camshafts shouldn't be effected if my theory is right. |
Originally Posted by BLKROKT
(Post 7703663)
I’m no lawyer, but if this is found to be consistent across all M156 camshafts, I smell a class-action lawsuit or at the very least a forced recall. It’s a critical design flaw. Even more so than the headbolt debacle.
Either way, that's a serious problem lol. |
I would love to see their "Control Plan" for this process. As industry standard, they should have higher levels of detection where there is higher chances of occurrence's. Sounds like someone didn't fill out their Potential Failure Mode and Effects Analysis honestly. :bs:
Originally Posted by sventastic82
(Post 7703678)
It's not really a design flaw as the head bolts were.
I would bet my money on that the bit which drilled the holes was damaged and partially broken off and didn't drill the hole deep enough. If they don't do a flow check and that info isn't traced with the 2D barcode then good luck finding the bookends. That is just going to be blown off by the manufacturer. Worst case they have to implement a poke yoke in their production step. At best they will recall the cars if the can find the bookends. Most likely the camshaft he used are made as a service part by the manufacturer. Which is a non standard set up for them and stuff like that happens all the time. In that case the original camshafts shouldn't be effected if my theory is right. |
Originally Posted by Dtorre1240
(Post 7703697)
I would love to see their "Control Plan" for this process. As industry standard, they should have higher levels of detection where there is higher chances of occurrence's. Sounds like someone didn't fill out their Potential Failure Mode and Effects Analysis honestly. :bs:
Definitely missed something or didn't follow something in the PFMEA. Just the potential effect of that failure should trigger a prevention and detection step. |
No. For MB to make this right I demand an SLS BS. (going out to car to block cam oil passages now)
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Ridiculous, right?!
I truly hope it is small error in just a smaller batch of bad camshafts, likely caused by incorrect drill depth setting. But a lot of the machining at MB is probably automated, so who KNOWS how many newer camshafts are faulty. Sven's theory of a possible broken drill bit is also very plausible. Older camshafts do not appear to be affected. There are reports of faulty New camshafts appearing in Germany, Australia, & Singapore (comments in Part 2 of this video above). Then there is the possible issue of planned obsolescence. . . The mind reels. And I just had all camshafts replaced with New a few months ago :smash: |
Originally Posted by MBNRG
(Post 7703815)
Ridiculous, right?!
I truly hope it is small error in just a smaller batch of bad camshafts, likely caused by incorrect drill depth setting. But a lot of the machining at MB is probably automated, so who KNOWS how many newer camshafts are faulty. Sven's theory of a possible broken drill bit is also very plausible. Older camshafts do not appear to be affected. There are reports of faulty New camshafts appearing in Germany, Australia, & Singapore (comments in Part 2 of this video above). Then there is the possible issue of planned obsolescence. . . The mind reels. And I just had all camshafts replaced with New a few months ago :smash: |
Alright!! So I’ve got a ‘09 with bad head bolts but likely OK oil passages in the cams! Yay balance in the universe...
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Originally Posted by Crya
(Post 7704091)
Alright!! So I’ve got a ‘09 with bad head bolts but likely OK oil passages in the cams! Yay balance in the universe...
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Originally Posted by BLKROKT
(Post 7704099)
Didn’t some of the ‘09’s come with soft metal cams? :mercy:
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If the oil cant pass thru, it must come out somewhere, so once is installed it wont work right. But how on earth could this happen with MB?
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One of the intakes is drilled and the other not? Which side is not drilled through, passenger?
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Originally Posted by BLKROKT
(Post 7703830)
I’d pull your valve covers and check those holes with a paperclip. Like, today. :(
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Originally Posted by Jasonoff
(Post 7704258)
You need to yank the cams to check. The hole is under the bearing cap.
I'll take a look at the normal cap reinstallation procedure, to see if the cap-by-cap can make sense. Meanwhile, i wonder if there is always the same cam that displays this problem. |
Taking off one cap for each cam should be sufficient.
The odds are very low that just some of the hole aren’t drilled deep enough. |
Originally Posted by Vladds
(Post 7704269)
Why not pull the cam bearing caps one by one, inspect, retighten?
I'll take a look at the normal cap reinstallation procedure, to see if the cap-by-cap can make sense.
Originally Posted by sventastic82
(Post 7704358)
Taking off one cap for each cam should be sufficient..
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Originally Posted by Jasonoff
(Post 7704366)
That would be handy if the holes were all pointing up. I wouldn't rotate the engine with a cap removed.
The CAD-CAM (excuse the '70's engineering term) of the factory machining rig would always drill for every cam at the same circular angle. Whatever angle Tassos's video shows (By example the lubrication hole is 30 degrees past the 4th intake lobes), our cams will have as well. We can take a look at Tassos's video and see the clocking of the holes vs the lobes and assess which way they're facing (the lubrication holes under the cover of the caps) by looking at the lobes of the cams, as the cams sit installed in our cars, with the valve covers removed. |
If everything left as is, what will be? it's strange because if that critical everyones should already know, not only tasos with couple of people over the world.
At this summer one intake camshaft was replaced on my ML and there is becoming noise when engine hot on replaced side |
I know this is an old thread, but this is affecting me directly. I bought new upper camshafts for me 2008 C63 since they were slightly worn out i went ahead and replaced them and the tappets while the camshaft was out anyways. few months have gone by and the engine sounds not lubed and the oil light comes on whenever it goes on the freeway (street driving is fine but high speed seems to throw the oil light) I think this is due to foaming since the oil cant get in any of the lube holes. unsure. I was scratching my head and scouring the internet when i saw Taso's video. I thought... surely I am not affected by this, but I pulled the covers and had a check.. sure enough the hole is blocked... on both sides... What is Mercedes remedy for this? has anyone else contacted Mercedes or am I the first? I'll be happy to update everyone with what happens incase this happens to anyone else.
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