Valve cover replacement on a 2005–2019 Nissan Frontier with the 4.0L VQ40DE V6 may address a cracked cover, perimeter oil leakage or failed spark-plug-well sealing. Typical complaints include a burning-oil smell, oil around ignition coils and smoke when leaked oil reaches hot exhaust parts. There is no dedicated diagnostic trouble code that identifies a failed valve cover; rough running or a misfire code requires its own diagnosis and does not prove these covers are the cause.
This is a two-bank replacement overview for the longitudinal 4.0L engine. The 2.5L four-cylinder and later 3.8L engine are different applications. The right-bank cover needs intake-collector access; the left side has a different access path. Left and right are determined from the driver’s seated position. The specifications identified below are from the cited factory references, and body access, ancillary fittings and service revisions must match the truck being repaired.
Advanced DIY for both banks
Allow 4–7 hours, plus cooling and sealant waiting time
Planning allowance: $110–$220 covers, plus $40–$120 seals and materials
Let the engine and cooling system become completely cold. Apply the parking brake, chock the wheels and isolate the battery negative cable after recording diagnostic data. Keep hands clear of fans and belts. Never open a hot coolant cap or start the engine with intake ports exposed. Cover open passages, account for every cloth and fastener, and protect wiring from solvent. If access beneath the truck is needed, use approved support points and rated stands. Stop for damaged threads, a pinched gasket, fuel leakage, an oil-pressure warning or a flashing malfunction light.
Featured pair of valve covers
The supplied link is for A-Premium ASIN B08HPB46CB. The ASIN-linked seller description identifies APEVC0063D: left and right plastic covers with gaskets, bolts and an oil filler cap. The manufacturer’s related two-cover catalog uses APEVC0063 and lists references 13264-EA200 and 13264-EA210. Match the exact selected package, original numbers, breather connections and seal arrangement before purchase. Do not treat a related catalog number as confirmation that every accessory is included.
View left and right valve cover kit
Vehicle compatibility
| Make / model | Catalog years | Engine | Restriction |
|---|---|---|---|
| Nissan Frontier | 2005–2019 | 4.0L VQ40DE V6 | Not 2.5L or 3.8L; this article’s principal vehicle family. |
| Nissan Pathfinder | 2005–2012 | 4.0L VQ40DE V6 | Not V8 or later transverse-engine Pathfinder. |
| Nissan Xterra | 2005–2015 | 4.0L VQ40DE V6 | Use Xterra access and ancillary specifications. |
| Nissan NV1500 / NV2500 / NV3500 | 2012–2019 catalog range | 4.0L VQ40DE where fitted | Not the V8; van access and engine availability differ by model. |
These conservative manufacturer-catalog ranges do not include every trim. Some seller descriptions extend the years; an extended advertisement does not establish that a particular engine was offered in every listed year. Use VIN-based parts identification and compare the installed engine, especially after an engine replacement.
Symptoms and diagnosis
- Clean the cold exterior and find the highest point where fresh oil returns. Oil from a filler-cap spill or a nearby timing-cover joint can resemble a cover leak.
- Inspect plug wells before removing spark plugs. Extract pooled oil and dirt first so it cannot fall into a cylinder. Inspect coil boots for deterioration separately.
- Check breather and PCV hoses for splits, restrictions and loose connections. A ventilation fault can contribute to recurrent leakage.
- An intact cover with a sound sealing groove may need only a gasket. A cracked, distorted or damaged assembly may justify replacing the whole cover.
- Record fault descriptions and freeze-frame data before clearing codes. Ignition, injector, compression and intake-leak problems can cause rough running independently.
- An external oil leak can exist with no warning light. Conversely, internal oil consumption or low oil pressure will not necessarily improve after replacing these covers.
Tools, parts and supplies
| Tool or Supply | Exact Product | Product Link | Purpose and Selection Check |
|---|---|---|---|
| Metric sockets and ratchet | TEKTON SKT15301, 46-piece 3/8-inch set, metric 8–19 mm | View socket and ratchet set | Includes the 10 and 12 mm sizes used in the related Frontier demonstration. Confirm each fastener and retain suitable extensions. |
| Low-range torque wrench | LEXIVON LX-180, 1/4-inch drive, 10–150 in-lb / 1.1–16.9 N·m | View inch-pound torque wrench | Its range covers both cover-tightening stages. Do not confuse inch-pounds with foot-pounds. |
| Socket-drive adapter | TEKTON SHA04101, 1/4-inch female to 3/8-inch male | View straight drive adapter | Connects the torque wrench to the socket set; use straight, fully seated attachments. |
| Hose-clamp pliers | Lisle 17100 flat-band hose-clamp pliers | View clamp pliers | For matching spring-band clamps; support old plastic fittings rather than twisting them. |
| Screwdriver | Klein Tools 32500 11-in-1 | View screwdriver | For matching intake clamps and small fittings. Its SAE nut drivers do not replace metric sockets. |
| Nonmetal scraper | KUSUFEFI two scrapers with 60 plastic blades | View plastic scraper kit | Remove residue gently. Keep particles outside the head; do not use abrasive discs. |
| Eye protection | DEWALT DPG82 Concealer goggles, one pair | View protective goggles | Wear during cleaning and coolant handling; select gloves according to the cleaner label. |
| Wheel chocks | MaxxHaul 70472 solid-rubber chocks, two-pack | View wheel chocks | Stabilize the parked truck on a firm level surface. |
| Fluid container | FloTool 42003MI, 16-quart drain container | View drain container | Catch coolant if the throttle-water circuit is opened. Capacity is not a refill quantity; do not mix waste oil and coolant. |
| Cooling-system vacuum refill tool — conditional | UView 550000 Airlift kit | View vacuum refill kit | Confirm radiator-neck adapter fit and follow the manufacturer’s compressed-air requirements. Requires a suitable separate air supply; it is not a self-contained compressor. |
| Diagnostic reader — optional | ANCEL AD310, black OBD-II reader | View engine-code reader | Record faults before disassembly. A basic reader cannot establish that a cover is bad or perform every Nissan service function. |
| Application-specific seals | Both cover gaskets; collector and throttle gaskets; PCV O-ring and any disturbed timing-solenoid seals | Match the VIN, engine and installed components | Do not assume the featured box includes intake gaskets or every ancillary seal. Renew mandatory non-reusable seals. |
| RTV and coolant | Nissan-specified engine RTV or an explicitly equivalent product; coolant matching the vehicle service specification | Select by specification, not color alone | Follow sealant placement, assembly time and cure instructions. Confirm the coolant already in the vehicle before topping up. |
| Cleaning supplies and higher-range tooling | Non-shedding cloths, compatible cleaner/gloves; torque equipment for ancillary fasteners above 16.9 N·m | Match the service procedure and tool range | The low-range wrench is insufficient for the 20.1 N·m collector-support example. Borrow or obtain correctly rated equipment before starting. |
DIY versus professional cost
These are U.S.-dollar planning estimates, not current product prices or shop quotes. With suitable tools already owned, allow approximately $150–$340 for the pair of covers and required seals/materials. Starting from an empty toolbox can add $150–$450 or more, particularly if cooling-system equipment and a compressor are needed. Inspect hoses before ordering so brittle connections do not stop the repair halfway through.
For an illustrative shop estimate, 4–7 labor hours at $120–$180 per hour adds $480–$1,260, making a rough total of $630–$1,600 before taxes or additional repairs. Obtain a quote for the actual vehicle and whether one or both banks need work. The easiest cost saving is avoiding an unnecessary cover replacement after a proper leak diagnosis.
Replacement overview
1. Prepare parts and access
Compare both covers and gaskets on a clean bench. Photograph the hose routing and brackets, label coil positions, and keep bank-specific fasteners separate. Remove the decorative cover and intake duct carefully. Do not touch the mass-airflow sensing element. Protect every open intake connection immediately.
2. Expose the right bank
The 2010 Frontier procedure removes the upper intake collector and throttle actuator, with a partial coolant drain on a cold engine. Label the brake-booster, PCV, EVAP and VIAS connections and release their brackets without pulling on wires. Renew the collector and throttle gaskets. The lower intake and fuel rail are separate components; do not disturb them simply to gain this cover access.
3. Free the coils, hoses and covers
Disconnect the coils and lift them without levering against brittle plastic. Release the PCV hoses and harness brackets. The 2010 Frontier procedure also calls for removal of the appropriate intake-valve-timing solenoid; retain its identification and fit the required replacement seal. Loosen each cover in the reverse of its factory numbered sequence, then lift it without prying against a machined sealing surface.
4. Clean and inspect
Keep debris out of the valvetrain. Remove old sealant with a non-damaging scraper and leave the gasket contact areas clean. Check the sealing grooves, plug-well seals, bolt holes and cover seating. A damaged head surface or stripped thread needs repair before assembly. Do not compensate by using extra RTV or higher bolt torque.
5. Fit the gasket and tighten
Seat new molded gaskets. Apply specified RTV only at the front camshaft-bracket/head joints, following the factory placement drawing. For the cited 2010 VQ40DE cover procedure, tighten in the numbered order first to 1.96 N·m (17 in-lb), then 8.33 N·m (74 in-lb). Use the separate left/right diagrams on EM-156–158. A general “crisscross” instruction is not a substitute for locating each numbered bolt.
6. Restore intake and ventilation
Refit the removed solenoids, coils, brackets and hoses with their specified seals and fastener values. Replace the PCV O-ring if the valve was removed. The cited collector nuts/bolts are 11 N·m; collector studs, if disturbed, are 6.9 N·m. Do not apply either value to every bracket or throttle bolt. Restore the brake-booster hose and all electrical locks before starting.
7. Finish the cooling and electrical work
If the coolant circuit was opened, refill and remove trapped air by the exact Nissan cooling procedure with suitable equipment. A radiator that appears full can still contain air. Restore the correct cap positions and check the cold reservoir level. Reconnecting the throttle actuator requires throttle closed-position learning; replacing the actuator adds further learning requirements. Do not treat an unresolved high idle or temperature rise as normal.
8. Check the repair
Respect the sealant’s assembly and curing requirements before adding fluids or starting. Count tools and protective coverings, confirm oil level, and inspect hose clearance. Start in a ventilated area and check the cover seams and disturbed coolant connections. Stop for a significant leak, smoke, an oil-pressure warning or unstable running. After a short gentle drive, let the truck cool and inspect again. Investigate returning faults rather than repeatedly tightening the covers.
Repair demonstration
The 1A Auto Frontier 4.0L demonstration is useful for recognizing access points. Its broad headline is not proof that all advertised years used this engine. Match the VQ40DE vehicle and follow its factory instructions; the demonstration uses another parts brand.
Common mistakes
- Ordering by model name without checking engine and original cover numbers.
- Assuming the pair includes intake gaskets, coolant, PCV seals and every disturbed O-ring.
- Using a foot-pound wrench where an inch-pound setting is required.
- Pinching a molded gasket or applying RTV around its entire perimeter.
- Breaking a hose nipple or leaving the brake-booster hose disconnected.
- Starting before removing port covers, completing coolant service and allowing the sealant to cure.
Frequently asked questions
Must both sides be replaced?
No. Diagnose both banks and replace what is defective. This product is a pair, so distinguish the package quantity from the repair actually needed.
Will new covers fix every misfire?
No. Oil contamination may contribute to ignition trouble, but damaged plugs or coils, an injector fault, compression loss or an intake leak need separate diagnosis.
Can I use this kit on a four-cylinder Frontier?
No. This guide and the paired-cover application concern the 4.0L VQ40DE V6. A four-cylinder has a different cover and procedure.
Why can the intake side take longer?
The right-bank access includes additional intake, hose and bracket work. Budget for those seals and final checks rather than comparing the job with a simple exposed four-cylinder cover.
Sources and further reading
- A-Premium two-cover catalog and reference numbers
- Seller’s ASIN-linked package description
- 2010 Nissan Frontier factory engine-mechanical manual — VQ40DE sections EM-140–142 and EM-155–158
- Nissan Pathfinder VQ40DE factory diagrams — related-engine reference, not a universal Frontier procedure
- 1A Auto Frontier 4.0L gasket-replacement demonstration
- UView Airlift manufacturer specifications and instructions
- Related HowToMechanic 2009–2010 Frontier ignition guide