The ominous sound of a failing timing chain

[EcoNomad]

The frigid weather drew my attention to this today. To hear the warning your R107 emits before to self-destruction, observe the timing chain oscillating post-startup in this video. Fearful expression.

She was taken to the shop immediately for an inspection and probable replacement of the guides and tensioner.

Thank you to everyone there who noted the chain slapping noise during cold starts. I am uncertain I would have seen it otherwise.

[EcoNomad]

https://drive.google.com/file/d/1cEG5A-UPJkERSblguidYUuUf1X5ToM7C/view

[partexpat]

The sound is indeed unpleasant; it is a much lengthier rattling compared to my first experience. I hope the repair proceeds well. What is the mileage of the vehicle?

[EcoNomad]

It is 143,000 km, or around 89,000 miles.

[partexpat]

While you or your technician are engaged in this task, it is advisable to replace the cam oiler tube retainers, since it is a cost-effective precaution and a straightforward procedure. Procure two sets, one for each side. My vehicle was in quite decent condition even after 120,000 miles, but it was a logical decision. Best of luck

[SneakerHead]

I would verify the guides and assess the chain's elongation before to purchasing a tensioner, particularly one from MB priced at $300. I encountered similar problem a few years back. I purchased a new tensioner, nevertheless the rattling persisted. Replaced the timing chain, which resolved the issue. Neither the new nor the old tensioner exhibits any rattling. At that time, the automobile had 70,000 kilometres.

[BoardGameGeek]

I will donate, since I also had an M117 engine.

It is necessary to replace the chain, the chain tensioner, and the plastic chain guides.

Replacing the plastic chain guides is crucial, since their deterioration leads to breakage, causing the chain to skip and resulting in the valves colliding with the pistons. Unpleasant.

The chain tensioner must be of a reputable brand. I acquired a FEBI, and it has been leaking oil from the rear. Consider purchasing two units, exploring other brands, or acquiring the original MB component.

Ultimately, this is insufficient; the synchronisation between the cams must be verified, and if it is incorrect, the appropriate Woodruff key must be acquired. Here is some information. If your technician is competent, he or she will see that this is a crucial step.

We completed the whole surgery with my engine. Subsequent K-Jetronic tweaking enabled the 5.0L engine in the 500SEC to achieve around 232 horsepower, consistent with the specifications for my vehicle.

[ZenMaster]

It is advisable to invest on the original MB tensioner. It is an essential component and not the context to be "penny wise, pound foolish."