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Hello, I've owned my W204 C320 CDi for almost three years.
It was suggested that I change the PVC valve because oil was leaking into the turbo and bat wing. I did so, but I noticed that there was still a little quantity of oil on the turbo's lip and some smearing on the bat wing.
He played about with the idea of showing a video of a sprinter with an om642 engine installed, but then stumbled into one showing the exact same problem.
You’re only seeing the surface.
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Part number OM642 PCV Valve
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EvestineBeetle
- Posts: 24
- Joined: Mon Feb 02, 2026 9:03 pm
I had to change the bolts on the rear engine where the PCV valve is located because oil was blowing past the seal. To do this, I used a small pry bar or screwdriver to loosen the three bolts that hold the valve in place, then I used bolts to pull it in tight (I used the bolts from the air filter for a bit longer until it pulled in), and finally I replaced the bolts with the original ones. The part number is A 642 010 01 31.
Although I'm sure some of you are already familiar with this, I figured it could be useful for others.
Although I'm sure some of you are already familiar with this, I figured it could be useful for others.
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RIVERPLAZAAA
- Posts: 43
- Joined: Mon Feb 02, 2026 8:42 pm
Excellent point, my friend. I made the same switch approximately three years ago after hearing about them.
Inexpensive solution..
Inexpensive solution..
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franchcars
- Posts: 41
- Joined: Mon Feb 02, 2026 8:38 pm
This section of the W212 OM642 has anyone else seen it? My attempt to purchase it was thwarted when MB Parts denied its existence on my automotive vehicles.
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EvestineBeetle
- Posts: 24
- Joined: Mon Feb 02, 2026 9:03 pm
Hello there, mate!
It seems that all of the engines are OM642. Take a look at the back of the engine, where the PCV valve is located.
It seems that all of the engines are OM642. Take a look at the back of the engine, where the PCV valve is located.
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franchcars
- Posts: 41
- Joined: Mon Feb 02, 2026 8:38 pm
A few years ago, these were the photos I took of the job.
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Karlsdealership
- Posts: 31
- Joined: Mon Feb 02, 2026 8:43 pm
The item that is most commonly used by yours is the 1791 assembly, which is a single part. The valve is the metal portion that bolts to the rear of the cam
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lumperjack
- Posts: 48
- Joined: Mon Feb 02, 2026 8:51 pm
The components, whether it's the metal body that attaches to the rear of the camshaft cover or the complete set with the rubber pipes and sensor, are easily accessible.
Gaining access again is a major pain. Following the same principle as the bulkhead approach described earlier, I jiggled it off the exhaust assembly below using a well-oiled seal and tube in conjunction with initially longer bolts and a long socket wrench.
The old one has not been inspected yet. The new seal, which is red and orange in colour, also requires some convincing to fit into the batwing throat.
Gaining access again is a major pain. Following the same principle as the bulkhead approach described earlier, I jiggled it off the exhaust assembly below using a well-oiled seal and tube in conjunction with initially longer bolts and a long socket wrench.
The old one has not been inspected yet. The new seal, which is red and orange in colour, also requires some convincing to fit into the batwing throat.