The BMW N20 Valvetronic Eccentric Shaft kit is designed for BMW 2.0L turbocharged engines used in models such as 320i, 328i, 420i, 428i, 520i and 528i across F-series platforms including F30, F32 and F10. Covering OE references 11377593894 and 11377630747, the assembly is supplied with servo motor and bearing set to restore full Valvetronic functionality in one installation.
In N20 engines, intake valve lift is controlled by the eccentric shaft rather than a conventional throttle system. After extended mileage, wear typically develops on shaft journals and bearing contact surfaces. This increases rotational resistance, placing additional load on the actuator motor and leading to issues such as unstable idle, reduced throttle response and adaptation limits during calibration.
To address these conditions, the 11377630747 bmw N20 Eccentric Shaft Valvetronic Actuator kit integrates the eccentric shaft, Valvetronic Servo Motor 11377603979, and Eccentric Shaft Bearings 11377615379 as a matched set. This configuration ensures consistent mechanical resistance across the system and supports direct replacement fitment no modification required, reducing installation variability during engine rebuild or repair.
| Product Name | BMW N20 Valvetronic Eccentric Shaft Repair Kit |
| Kit Contents | Eccentric Shaft × 1, Valvetronic Servo Motor × 1, Needle Bearing Set × 4 |
| Eccentric Shaft OE | 11377630747, 11377593894 |
| Servo Motor OE | 11377603979, 11377599021 |
| Bearings OE | 11377615379, 11377500978, 11370150710 |
| Engine Platform | BMW N20 / N20B20 |
| Engine Displacement | 2.0L Turbo |
Workshops frequently see the following signs on N20 engines between 80,000 and 150,000 km:
Rough idle or hesitation during light throttle
Reduced power under load with occasional limp mode
Fault codes related to Valvetronic sluggish response or sensor plausibility
Binding when the eccentric shaft is rotated manually after valve cover removal
Increased servo motor current draw visible on diagnostic equipment
Early diagnosis involves checking shaft resistance by hand and monitoring actuator adaptation values. If the shaft shows visible wear grooves deeper than 0.1 mm or if bearings feel notchy, the full set prevents repeat failures.
Components in this kit are manufactured under strict dimensional control, with shaft geometry and bearing clearances held to OEM tolerances. The servo motor undergoes bench testing — including worm-gear engagement verification and position sensor output check — prior to packaging. Bearings are pre-lubricated at the factory, consistent with original BMW specifications.
Our supply chain operates entirely from the manufacturing facility. There is no European warehouse or regional distribution centre — shipments move factory-direct to the buyer. For distributors and workshop groups placing regular orders, this means stable availability without seasonal stock constraints, and pricing that reflects direct-factory terms rather than multiple mark-up layers. Custom or neutral packaging is available for resellers.
We supply parts to professional repair workshops, engine rebuilders, parts distributors, and trade buyers across Europe, the Middle East, and beyond. Documentation, including dimensional reports and test records, is available on request for buyers with quality system requirements.
1.Is this kit compatible with all BMW N20 engines?
Yes, it is designed for N20 / N20B20 engines. Compatibility should still be verified using OE numbers such as 11377593894 or 11377630747 before ordering.
2.Does this kit fit BMW 320i, 328i and 528i models?
Yes, these models commonly use N20 engines, especially in F30, F32 and F10 platforms. Engine code confirmation is recommended for accuracy.
3.Can this kit be used for engine rebuild projects?
Yes, it is frequently used in N20 engine rebuilds, particularly when addressing Valvetronic-related faults or high mileage wear.
4. Do I need to replace the servo motor at the same time?
In most cases, yes. Increased shaft resistance often leads to servo motor overload, which reduces its service life.
5. Is it necessary to replace the bearings together with the shaft?
Yes, bearing wear affects shaft alignment and rotation resistance. Reusing old bearings can lead to incorrect calibration.
6. Can replacing only the servo motor fix the issue?
It may temporarily clear the fault, but if the shaft or bearings are worn, the problem usually returns.
7.How long does this component typically last?
Service life varies depending on maintenance, but replacement is commonly required between 100,000 and 150,000 km.
8.Are the components in this kit pre-matched?
Yes, the eccentric shaft, servo motor and bearings are supplied as a matched set to ensure consistent operation.
9.Can a faulty eccentric shaft damage the servo motor?
Yes, increased rotational resistance places additional load on the motor, which can lead to failure.
10.Does this kit include sensors or additional electronics?
No, the kit includes eccentric shaft, servo motor and bearings only.
11.Is this product suitable for bulk purchasing or distribution?
Yes, it is supplied directly from the factory with stable production capacity, suitable for distributors and rebuild suppliers.
12.Is this a direct replacement part?
Yes, it is designed as a direct replacement based on OE specifications, with no modification required.
13.Are there packaging options for distributors who want to resell under their own brand?
Yes. Neutral packaging and custom branded packaging are both available. Please discuss your requirements with us at the time of enquiry.
14.What is the lead time for orders?
Lead time depends on order volume. Single units and small batches typically dispatch within 3–7 business days. Larger volume orders may require a confirmed production slot. Contact us directly for a time and quantity quote.
15.How do I verify the correct eccentric shaft version for my specific N20 vehicle?
The safest method is a VIN check. The part number supersession from 11377593894 to 11377630747 means both numbers may appear in service data depending on production date. Both are covered by this kit. When in doubt, share the VIN with us before ordering.
English.webp "BMW N55 Valvetronic Eccentric Shaft-OE 11377589883")
.webp "BMW N20 Valvetronic Eccentric Shaft-OE 11377630747")
