OVERVIEW
Factory threaded stud for the specified diesel-engine attachment
N-900-803-01 is a Genuine VW/Audi M10 x 45 threaded stud. It replaces the original threaded pin at the specified diesel-engine locations below, including the cataloged timing-belt tensioner attachment on the 1985 Golf.
A stud provides threaded engagement at both ends while maintaining the intended mounting position for the attached component. Correct overall specification and original application are essential; a different-length stud can change engagement or component clearance.
Technical details
- Complete factory number: N-900-803-01.
- Factory specification: M10 x 45 mm threaded pin.
- Design: Headless stud with threaded ends and an unthreaded center section; match the complete original number.
- Quantity supplied: one individual stud; tensioning roller, nut, washer and other components are supplied separately.
The M10 x 45 specification describes the nominal fastener size. No unverified end-thread lengths, thread pitch, strength class, tightening torque or shipping measurements are supplied.
Common reasons to replace
- Damaged threads at either end that prevent the specified component or nut from seating correctly.
- A bent stud or damaged mounting section found during component service.
- A missing stud or an incorrect length installed during a previous repair.
Inspect the receiving threads and the attached component before replacement. On a timing-belt application, bearing noise, belt tracking or tension problems require diagnosis of the belt and tensioner system; a replacement stud alone does not repair those components.
Vehicle fitment
Match the engine code and specific attachment below. Gasoline engine studs and other diesel revisions can use a different number even within the same vehicle generation.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Volkswagen Golf | 1985 | 1.6L naturally aspirated diesel | Mk2 hatchback, FWD; Original configuration | Original timing-belt tensioner threaded-pin position specifying N-900-803-01; match the factory engine and tensioner assembly. |
| Volkswagen Golf | 1988 | 1.6L naturally aspirated diesel, ME | Mk2 hatchback, FWD; Original configuration | Original cylinder-block threaded-pin location assigned to DIESEL: ME. Not the PF/RV gasoline M10 x 40 stud or a cylinder-head clamping bolt. |
| Volkswagen Jetta | 1992 | 1.6L naturally aspirated diesel, ME | Mk2 sedan, FWD; Original configuration | Original cylinder-block threaded-pin location assigned to DIESEL: ME. Other diesel/gasoline engine codes require separate confirmation. |
Installation guidance
Follow the engine-specific repair procedure, including any timing-belt positioning and tensioning requirements. Do not force a stud into damaged receiving threads or grip and deform its working threads.
Use the specified installation method and seating depth for the exact joint. Fit the required original nut and washer arrangement, then complete all timing and clearance checks required by the service procedure.
Ordering information
New and unused inventory. Sold individually as N-900-803-01. Confirm the original full number, engine code and quantity required before ordering.