Description
DNJ Engine Timing Covers are essential components that seal the engines timing system, protecting critical internal parts from contaminants like dirt, debris, and moisture. These covers are designed to ensure a perfect fit and proper alignment with surrounding components, helping to prevent oil leaks and maintain engine timing accuracy. Depending on the application and timing cover design, some units may include an integrated oil pump. Each DNJ Engine Timing Cover includes the necessary mounting gaskets or seals, depending on the application, providing a complete solution for proper engine service. DNJ Engine Timing Covers are manufactured from high-grade materials such as die-cast aluminum, stamped steel, or durable reinforced plastic. Die-cast aluminum provides excellent structural rigidity, heat dissipation, and corrosion resistance, making it ideal for high-temperature environments. Stamped steel versions offer strong structural integrity and effective sealing properties, while reinforced plastic covers are lightweight and resist thermal expansion and chemical degradation. Each material is carefully selected to meet the performance and longevity requirements of its respective engine design. All DNJ Engine Timing Covers are manufactured to meet or exceed OEM quality standards. DNJ also offers a full range of related timing components, including timing chain kits, timing belt kits, variable valve timing sprockets and solenoids, camshaft seals, crankshaft seals, complete gasket sets, and more. With precision engineering and top-tier materials, DNJ Engine Timing Covers deliver exceptional performance and long-lasting durability.
Compatible Vehicle
| MAKE | MODEL | YEAR | ENGINE |
|---|---|---|---|
| Toyota | 4Runner | 2003-2009 | 4.0L 3956CC 241Cu. In. V6 GAS DOHC |
| Toyota | FJ Cruiser | 2007-2009 | 4.0L 3956CC 241Cu. In. V6 GAS DOHC |
| Toyota | Tacoma | 2005-2009 | 4.0L 3956CC 241Cu. In. V6 GAS DOHC |
| Toyota | Tundra | 2005-2009 | 4.0L 3956CC 241Cu. In. V6 GAS DOHC |
Not sure this is your casting? Call 866-766-9955 with your casting number and your vehicle's year, make and engine, and we'll confirm it before you buy.
Process & Warranty
Cylinder Head Rebuilding Process
1. Initial Inspection: As a unit comes to our shop, we give it an initial inspection to determine whether there is any reason the head should not proceed to rebuilding. This quickly catches problems such as cracks, casting damage and other conditions that would halt the process for that casting.
2. Teardown: The cylinder head is fully disassembled, which reveals other areas of potential damage to the casting. The parts and the head are separated and go through different cleaning processes.
3. Cleaning: Cast iron heads are cleaned in a thermal cleaning system — baked at 600° to reduce grease and oil to ash, then put through a steel-shot machine for a brilliant finish. Aluminum heads are baked at a lower temperature or put through a high-pressure wash, then glass-beaded.
4. Head Inspection: After cleaning, heads are pressure tested or Magnafluxed to find any cracks. All bolt holes, valve guides, valve seats and other areas are inspected for broken bolts, broken taps, cracked guides and other impairments. Straightness and cam bore wear are also checked.
5. Machining: All heads have guides installed to meet OE conditions and are resurfaced to far exceed factory specifications for surface finish. A three-angle valve job achieves valve seat runout under .001". Valves are ground for a perfect seal between valve and seat.
6. Assembly: New OE-style valve guide seals are installed. Springs are tested for proper seat pressure. Valve seat sealing is vacuum-checked for an airtight fit. Lifters are bled and rebuilt for zero lash after startup. Cams are polished and clearances are checked twice to meet OE oil clearances.
7. Final Inspection: Every head is visually inspected — surface finish, lash, bolt holes and all other areas — to ensure a quality cylinder head.
Questions about our cylinder head services? Call 1-866-766-9955.
Warranty — 12 months from purchase
Match the head before installation. We will not warranty an incorrectly installed head. Call us immediately with any questions or concerns about your purchase.
First 3 months:
- Repair or replacement of the cylinder head.
- Gasket set supplied for reinstallation.
- Labor calculated from book time at $25.00 per hour, up to a maximum of 10 hours.
- Replacement of fluids and filters.
Remaining 9 months:
- Repair or replacement of the cylinder head.
- Gasket set supplied for reinstallation.
- Replacement of fluids and filters.
- No labor is covered.
Warranty is void if:
- The head was improperly installed.
- The head was overheated (heat tab melted or missing).
- The head received insufficient oiling.
- The cooling system operated improperly.
Warranty returns must be sent to Allied Motor Parts uncleaned and fully assembled — any disassembly voids the warranty — and must be accompanied by proof of purchase. There is no warranty on threaded bolt holes after installation.
This warranty is in lieu of any other warranty, expressed or implied, including any implied warranty of merchantability or fitness for a particular purpose.
Quality Assurance
Here’s why our cylinder heads stand out:
Thorough Inspection: Every head undergoes a complete teardown, cleaning, and detailed inspection for cracks and imperfections.
Advanced Cleaning: Thermal cleaning for cast iron and high-pressure washing for aluminum ensures a brilliant finish.
Precision Machining: CBN resurfacing, triple-angle valve cuts, and guide installations exceed OEM specifications.
Rigorous Testing: Vacuum tests, tension checks, and pressure tests guarantee performance and durability.
High-Quality Components: New seals, plugs, and rebuilt lifters ensure optimal functionality.
Final Assurance: Each head is inspected, stamped, and stored in a climate-controlled environment.
Wide Availability: Over 2,000 cylinder heads for all makes and models, ready for repair or exchange.