Genuine Nissan RB20 RB25 RB26 Upper Timing Cover Lower Bolt – 13504-58S00
Restore the factory fitment and appearance of your Nissan RB-series engine with the Genuine OEM Nissan Upper Timing Cover Lower Bolt – 13504-58S00, a factory replacement shoulder bolt designed for compatible RB20, RB25 and RB26 timing belt cover assemblies.
This genuine Nissan fastener secures one of the lower mounting points of the upper timing belt cover, helping keep the cover correctly positioned and securely attached to the front of the engine.
The factory timing belt covers help protect the timing belt and associated components from dirt, debris and external contamination. Using the correct mounting hardware is an important part of maintaining the original timing cover assembly.
Over time, original timing cover bolts can become corroded, damaged, rounded or lost during timing belt replacements, engine maintenance and rebuilds.
Whether you're restoring an R32 Skyline GT-R, maintaining an RB25DET or completing an RB26DETT engine rebuild, genuine Nissan hardware provides factory-style fitment and appearance for compatible applications.
Important: This product is sold individually. Two (2) lower mounting bolts are required per compatible upper timing cover. Please select a quantity of two if replacing both bolts.
Product Details
- Brand: Genuine Nissan
- Part Number: 13504-58S00
- Product Type: Upper Timing Belt Cover Lower Mounting Bolt
- Bolt Design: Factory Shoulder Bolt
- Installation Position: Lower Mounting Points of Upper Timing Cover
- Finish: Genuine Nissan OEM Metal Finish
- Quantity Supplied: 1 Bolt
- Quantity Required: 2 Bolts per Compatible Upper Timing Cover
- Condition: Brand New – Genuine Nissan OEM
Engine Compatibility
- Nissan RB20DE – Selected factory timing cover assemblies
- Nissan RB20DET – Selected factory timing cover assemblies
- Nissan RB25DE – Non-NEO applications with compatible timing covers
- Nissan RB25DET – Non-NEO applications with compatible timing covers
- Nissan RB26DETT – Compatible factory timing cover assemblies
Vehicle Compatibility
- Nissan Skyline R32 – Selected RB-powered models
- Nissan Skyline R33 – Selected RB-powered models
- Nissan Skyline R34 – Selected compatible RB-powered models
- Nissan Skyline R32 GT-R (BNR32) – RB26DETT
- Nissan Skyline R33 GT-R (BCNR33) – RB26DETT
- Nissan Skyline R34 GT-R (BNR34) – RB26DETT
- Nissan Stagea WC34 – Selected RB-powered models
- Nissan Stagea 260RS (WGNC34) – RB26DETT
- Nissan Laurel C33 / C34 – Selected RB-powered models
- Nissan Cefiro A31 – Selected RB-powered models
Important Fitment Information: Compatibility depends on the engine variant, production date and original timing cover configuration.
Please confirm Nissan part number 13504-58S00 against your existing fastener or factory Nissan parts catalogue before purchasing.
NEO RB engines, aftermarket timing covers and modified engine configurations may require different mounting hardware.
Key Features & Benefits
- Genuine Nissan OEM replacement timing cover bolt
- Manufactured to original Nissan equipment specifications
- Factory shoulder bolt design for compatible mounting positions
- Designed to secure the lower section of the upper timing belt cover
- Correct factory-style dimensions and thread for its intended application
- Replaces missing, damaged or corroded original hardware
- Ideal for timing belt replacements and engine rebuilds
- Suitable for RB20, RB25 and RB26 engine restorations
- Helps maintain the original factory engine bay appearance
Why Replace Your Timing Cover Bolts?
The upper timing belt cover is an important part of the factory RB-series timing belt assembly, providing a protective barrier around the timing belt and associated components.
The lower mounting bolts help secure the upper cover in its intended position.
During routine timing belt maintenance, these fasteners are removed and reinstalled. After decades of servicing, original bolts may show signs of corrosion, damaged threads or worn bolt heads.
Common reasons for replacement include:
- Missing timing cover mounting bolts
- Rounded or damaged bolt heads
- Corroded or deteriorated original hardware
- Damaged threads
- Upper timing cover removal or replacement
- Timing belt and water pump servicing
- Engine rebuilds and restoration projects
Replacing damaged or missing hardware with genuine Nissan components helps maintain the correct factory mounting arrangement.
Two Bolts Required Per Upper Timing Cover
The compatible factory upper timing belt cover uses two (2) lower mounting bolts of part number 13504-58S00.
This listing includes one (1) bolt only.
If you're replacing both lower mounting bolts, please order a quantity of two.
Other timing cover mounting positions may use different bolt lengths or part numbers. Always match the fastener to its designated mounting location.
Ideal for RB-Series Timing Belt Services
Timing belt maintenance is an important part of keeping Nissan RB-series engines in good mechanical condition.
When removing the factory timing covers for a timing belt replacement, water pump service or front engine inspection, it's a good opportunity to check the condition of the original mounting hardware.
Replacing missing or damaged fasteners during servicing helps ensure the timing covers can be reinstalled correctly.
This genuine Nissan timing cover bolt is ideal for:
- RB20DET timing belt servicing
- RB25DET timing belt replacements
- RB26DETT engine rebuilds
- R32, R33 and R34 Skyline GT-R restorations
- Factory timing cover replacement
- Front engine maintenance
- Replacing missing or damaged mounting hardware
- Factory-correct engine bay restorations
Installation Information
Before installation, confirm that the replacement bolt matches the original mounting position, length and thread specification.
Inspect the threaded mounting point for damage, corrosion or contamination.
Position the upper timing belt cover correctly and start the bolt by hand to avoid cross-threading.
Follow the applicable Nissan factory workshop manual for the correct installation procedure and tightening specification.
Do not overtighten: Excessive tightening may damage the fastener, timing cover or mounting threads.
Why Choose Genuine Nissan?
Genuine Nissan replacement hardware is manufactured to original equipment specifications, providing the correct factory-style dimensions, fitment and appearance for compatible applications.
For classic Nissan performance engines such as the RB20DET, RB25DET and RB26DETT, genuine replacement fasteners are an excellent choice for maintaining originality and completing detailed engine restorations.
Note: This listing includes one (1) Genuine Nissan Upper Timing Cover Lower Bolt – 13504-58S00 only. Two (2) bolts are required per compatible upper timing cover and are sold individually. The timing cover and additional mounting hardware are not included. Supplied in genuine Nissan OEM packaging, which may be removed for product photography.
Australian Stock & Fast Dispatch: At OEM4JDM, every part listed as In Stock is physically on our shelf in Australia and ready for fast dispatch.