A0149977146 PCV Valve Oil Seal for Mercedes-Benz OM642 Diesel
This PCV valve oil seal is designed for Mercedes-Benz OM642 V6 diesel engines using OEM reference A0149977146 / A 014 997 71 46. It restores the airtight seal around the crankcase ventilation valve and helps prevent oil seepage near the PCV valve area.
The OM642 crankcase ventilation system operates under oil vapor, heat and pressure changes. When the original seal hardens or deforms, oil leaks and air leaks can appear around the PCV valve, affecting engine cleanliness, intake sealing and crankcase ventilation performance.
OEM / Reference Numbers
- A0149977146
- A 014 997 71 46
Compatible PCV valve reference numbers listed for this application:
- A6420101791
- A6420101291
- A6420103707
- A6420101491
- A6420101191
- 6420102391
- 6420101691
- A6420100131
- A6420107215
- 5175512AA
Part Type
- PCV valve oil seal
- Crankcase ventilation valve gasket
- PCV valve sealing gasket
- Oil-resistant rubber seal
- Mercedes-Benz OM642 crankcase ventilation seal
What This Part Does
The crankcase ventilation valve helps manage pressure and oil vapor inside the engine. The oil seal around the PCV valve keeps this area airtight and prevents oil from escaping around the valve connection.
Replacing a worn seal helps restore proper sealing of the crankcase ventilation system and can reduce oil contamination near the turbo inlet, intake components and nearby sensors. This is a targeted seal replacement, not a complete PCV valve replacement.
Compatible Vehicles
This oil seal is listed for Mercedes-Benz vehicles equipped with compatible OM642 V6 diesel engines.
- Mercedes-Benz ML-Class / GL-Class — W164, X164
- Mercedes-Benz C-Class / GLK-Class — W204, S204, C204, X204
- Mercedes-Benz E-Class — W212, S212, V212, W213, S213, X213, C207, A207, C238
- Mercedes-Benz CLS-Class — C218, X218
- Mercedes-Benz GLC / GLE Coupe — X253, C253, C292
- Mercedes-Benz G-Class / R-Class — W463, W251, V251
- Mercedes-Benz Sprinter — W906
- Mercedes-Benz Vito / Viano — W639
Important: compatibility depends on the exact OM642 engine configuration and PCV valve number. Always compare your original seal and PCV valve reference before ordering.
Engine / Engine Family / Technical Detail
- Engine family: Mercedes-Benz OM642
- Engine type: V6 diesel
- System: PCV / crankcase ventilation
- OEM seal reference: A0149977146 / A 014 997 71 46
- Repair type: oil seal / gasket replacement only
- Material function: oil-resistant rubber for high-temperature engine operation
Common Symptoms of Failure
- Oil seepage around the PCV valve area
- Oil contamination near the turbo inlet
- Oil residue around the crankcase ventilation connection
- Air leak or poor sealing around the PCV valve
- Check engine light related to intake or ventilation pressure issues
- Need for PCV system service on OM642 diesel engines
Why Choose This Replacement
- Targets OEM seal number A0149977146
- Designed for Mercedes-Benz OM642 V6 diesel PCV applications
- Helps stop oil leaks around the crankcase ventilation valve
- Restores airtight sealing of the PCV valve area
- Cost-effective alternative to replacing the complete PCV valve when only the seal has failed
- Useful during turbo inlet, PCV valve or intake maintenance
Important Before Ordering
- Check your original seal number before purchase.
- Confirm compatibility with OEM A0149977146 / A 014 997 71 46.
- Compare your PCV valve number with the listed compatible references.
- Verify that your vehicle uses the Mercedes-Benz OM642 V6 diesel engine.
- This product is an oil seal / gasket only.
- This is not a complete PCV valve or oil separator assembly.
- Inspect the PCV valve housing and sealing surface before installation.
FAQ
What does Mercedes-Benz OEM A0149977146 fit?
OEM A0149977146 is listed for the PCV crankcase ventilation valve oil seal used on compatible Mercedes-Benz OM642 V6 diesel engines, including selected ML, GL, C-Class, GLK, E-Class, CLS, GLC, GLE Coupe, G-Class, R-Class, Sprinter, Vito and Viano applications.
Is A 014 997 71 46 the same number as A0149977146?
Yes. A 014 997 71 46 is the spaced Mercedes-Benz catalog format of OEM number A0149977146. Both refer to the same PCV valve oil seal application.
What does this OM642 PCV valve oil seal do?
The seal keeps the crankcase ventilation valve connection airtight and helps prevent oil seepage around the PCV valve. It supports correct sealing of the OM642 crankcase ventilation system.
What symptoms indicate a failed Mercedes OM642 PCV seal?
Common signs include oil leakage near the PCV valve, oil residue around the turbo inlet area, poor sealing of the crankcase ventilation connection or intake-related pressure issues caused by an air leak.
Is this a complete PCV valve or oil separator?
No. This product is the oil seal / gasket for the crankcase ventilation valve only. It does not include the complete PCV valve, oil separator or breather assembly.
How do I confirm compatibility before ordering?
Confirm that your engine is an OM642 V6 diesel, check the original seal reference A0149977146 / A 014 997 71 46 and compare your PCV valve number with the listed compatible valve references before ordering.
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Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings