OVERVIEW
Factory camshaft-adjuster fastening hardware
N-912-646-01 is a Genuine VW/Audi camshaft-adjuster bolt with an internal multipoint drive and a collared head. Its confirmed applications use the specified 1.4T timing-belt engine arrangement in the Golf and Jetta.
Camshaft-adjuster fastening is part of the engine timing system. Correct bolt geometry and the engine-specific tightening sequence help establish the intended attachment; this individual bolt does not include an adjuster, timing belt, sealing plug or complete service kit.
Technical details
- Complete factory number: N-912-646-01.
- Factory specification: M10 x 1.25 thread, collared head with internal multipoint drive.
- Design: Long shank and flange-style head with recessed multipoint drive.
- Quantity supplied: one individual bolt.
Thread diameter and pitch are confirmed factory specifications. Select the complete N-912-646-01 number for the assigned camshaft attachment rather than substituting a general-purpose M10 bolt.
Common reasons to replace
- Replacement during camshaft-adjuster or timing-belt work when required by the factory procedure.
- A damaged multipoint drive or damaged threads that prevent controlled tightening.
- Missing hardware, an incorrect substitute or physical damage discovered during engine service.
Timing faults, noise or camshaft correlation codes require diagnosis of the complete system. A bolt alone will not correct a worn adjuster, damaged belt, incorrect timing or an oil-control fault.
Vehicle fitment
The table is restricted to the specified CZTA/DGXA 1.4T engines. Other engines sold in the same model and year require separate hardware confirmation.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Volkswagen Jetta | 2016–2018 | 1.4L turbocharged gasoline, CZTA | Mk6 sedan, FWD; 5-speed manual or 6-speed automatic | Original camshaft-adjuster/timing-belt attachment specifying N-912-646-01. Excludes GLI, Hybrid, 1.8T and 2.0L engines. |
| Volkswagen Jetta | 2019–2021 | 1.4L turbocharged gasoline, DGXA | Mk7 sedan, FWD; 6-speed manual or 8-speed automatic | Original camshaft-adjuster/timing-belt attachment specifying N-912-646-01. Excludes GLI and 2022-on 1.5L engine applications. |
| Volkswagen Golf | 2019–2021 | 1.4L turbocharged gasoline, DGXA | Mk7.5 hatchback, FWD; 6-speed manual or 8-speed automatic | Original camshaft-adjuster/timing-belt attachment specifying N-912-646-01. Excludes GTI, Golf R, SportWagen, Alltrack and e-Golf. |
Installation guidance
Use the correct engine locking and counterholding tools and follow the factory timing procedure. Keep the valve train in the prescribed service position and use the specified tightening sequence and thread preparation.
Replace seals, plugs and other single-use hardware where the engine procedure requires them. Verify mechanical timing and complete the prescribed post-service checks before operating the vehicle.
Ordering information
New and unused inventory. Sold individually as N-912-646-01. Confirm engine code, complete part number and required quantity before ordering.