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Camshaft tone/reluctor wheel shifted out of its position seems not un-common
When I watched Pine Hollow AD channel and seeing a few cars having its camshaft tone wheel ( reluctor wheel ) shifted and causing long crank or crank-no-start due to wrong
timing information received by the engine computer, I thought that was BAD and won't happen to MB cars....
Lo and behold, this unfortunate case is not so un-common for M276 too...
If one search this MB website, one would find it.
If one search youtube, one would find a few cases already.
Why MB did not at least dot-weld those tone wheel is a sad suprise.
Hhhmmmm.....I wonder when will be a good time/mileage to do the tiny dot welding to prevent the tone/reluctor wheel from spinning on my engine.
I hate to have to do injectors seal, in order to gain access to do it.
Saw the same videos, and I am puzzled about why these reluctor wheels are assembled this way? Is it a manufacturing process-related issue? That is, they must be added after the fact. For example, the MB ones have marks etched on the shaft, why? It seems the camshaft goes through multiple steps before is certified for assembly/sale.
Does it go through final machining, balancing, etc and once that is finished the correct position for the etching is decided? Once the etching is finished, the reluctor wheel is assembled. In my naive view, I would have machined a slot with a key similar to a harmonic balancer on the crankshaft.
Now, this pressing of the reluctor wheels is not an MB thing, it happens to GM, Chrysler and others. For example, even KIA has a similar issue and the reluctor wheel is not fully pressed. It uses two pins to lock the wheel in position with the timing gear and those pins break off and the wheel slips
I think that those would only be able to get out of adjustment if you leave failed camshafts adjusters running for long. I imagine that the while the adjusters are "banging" wild from side to side during start-up that would create enough impact force to move the sensor wheel out of place. But it might just be wishful thinking from my part.
I think its all about speed of manufacturing ...hence $$ savings by bean counters.
I am better off paying US$50 more for the car price , instead of having to deal with the potential of the camshaft tone wheel shifting its position down the road later.
Here is a funny one on PLASTIC el-cheapo.
My friend has a V8 Porche Cayenne, its quite old when the 3 coolant plastic pipes cracked and leak coolant. It is inside the Vee bank
And the funny thing is, the new parts sold by Porsche is called updated part and is made out of ALUMINUM hahahaha, what a dumb-azz initial design.
I know... I mean, I all forward to the benefits of what the advancements of material engineering can bring, but if money is the only thing taken into consideration it can end badly. Modern plastics are becoming a great material, but for really high temperature applications they are just not there yet... It is a matter of when they will crack. Parts that get constantly cooled (air intakes, cooling system componentes, etc.) will still survive a long time, but anything contacting the block directly is usually at risk. I think ours M276 have a similar situation but with the crankcase ventilation system. If I'm not mistaken there is a big plastic component in the middle of the V, sitting just below the intake manifold, waiting to crack an spill oil everywhere.
I think that those would only be able to get out of adjustment if you leave failed camshafts adjusters running for long. I imagine that the while the adjusters are "banging" wild from side to side during start-up that would create enough impact force to move the sensor wheel out of place. But it might just be wishful thinking from my part.
maybe, bit the KIA ones slip and without VVT , and with two locking pins.
Welding better be bullet proof or something may end up flowing down. Still think a key is the right way
Carmakers use the cheapest process possible to produce what they consider a product fit for use.
Welding and slot machining are undebatably better assembly steps for the reluctor wheel but are more costly than a simple press process. The result (lifespan of the assembled parts) is good enough for MB.
Carmakers use the cheapest process possible to produce what they consider a product fit for use.
Welding and slot machining are undebatably better assembly steps for the reluctor wheel but are more costly than a simple press process. The result (lifespan of the assembled parts) is good enough for MB.
Mostly good enough for the bean counters and lawyers who convince auto makers "The pushback will be minimal"
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