VLOM Gasket Tray: Your $350 DIY Fix or a $1,200 Shop Bill
Quick Answer
Problem: The VLOM (Valve Lifter Oil Manifold) gasket tray on the 5.3L/6.2L EcoTec3 engine can fail, causing oil leaks, low oil pressure, and lifter-related misfires.
Cost Range (2026 Est.): Parts (GM #12674590 tray/gasket kit) ~$85-$120. With labor, expect $450-$750 at a shop.
Time to Fix: Approximately 2.5-3.5 hours of labor to remove the intake manifold and replace the tray.
Actionable Advice: Use a quality inch-pound torque wrench and follow the specific sequence to 62 in-lbs (just over 5 ft-lbs) to prevent warpage and ensure a proper seal.
For specific year variations and engine codes, see the detailed sections below.
Symptoms
As a master technician, I see these specific, repeatable symptoms when a VLOM (Valve Lifter Oil Manifold) gasket or tray on a GM 5.3L, 6.2L, or other V8 Silverado/Sierra engine begins to fail or was installed incorrectly. Look for these signs:
- Persistent DTC P0521 (Engine Oil Pressure Sensor Performance): The most common code. The ECM sees oil pressure that is too low or doesn’t match expected values for the RPM, often due to internal leakage at the VLOM.
- Illuminated Oil Pressure Warning Light on the dash at idle or low RPM, even with confirmed adequate oil level. The gauge may read erratically or very low (e.g., under 20 psi).
- Audible lifter “tick” or “tap” noise from the top of the engine, particularly at startup or idle. This is caused by oil bleeding down from the lifters due to lost pressure.
- Reduced engine performance or misfires (DTCs P0300-P0308) as the AFM/DOD lifters fail to properly activate/deactivate due to low control oil pressure.
- Excessive oil consumption beyond typical expectations, as oil can be drawn into the intake manifold through a leaking VLOM gasket.
- Oil seepage or residue visible at the intake manifold-to-cylinder head valley, though a leak is not always externally visible.
- Rough idle or a no-start condition in severe cases where oil pressure is too low for the Variable Valve Timing (VVT) system to function.
Note: Proper diagnosis requires a mechanical oil pressure gauge test. The repair typically involves replacing the VLOM gasket/tray (GM Part #12689445 for many Gen IV/V engines) and torquing the VLOM bolts in the correct sequence to 89 in-lbs (about 7.4 ft-lbs).
Diagnosis
Silverado VLOM Gasket Tray Diagnostic & Torque Procedure
Authoritative Note: The VLOM (Valve Lifter Oil Manifold) gasket tray, also known as the oil manifold assembly (GM Part # 12674553), is a critical seal on 5.3L, 6.2L, and other GM V8 engines with Active Fuel Management (AFM) or Dynamic Fuel Management (DFM). Improper torque or a failed gasket causes low oil pressure, lifter noise, and catastrophic engine damage.
- Initial Diagnosis & Symptoms
- Primary Symptom: Persistent low oil pressure warning (under 20 psi at idle) on a warmed-up engine.
- Secondary Signs: Lifter tick or knock, particularly from the valley of the engine. DTCs P0521 or P06DD may be stored.
- Visual Inspection: With the intake manifold removed, check for oil pooling in the engine valley. Inspect the VLOM tray for visible cracks or seal extrusion.
- Parts & Preparation
- Critical Parts: VLOM Gasket Tray (GM #12674553, ~$85). Do not reuse the old tray.
- Additional Parts: Intake manifold gaskets, new valley cover bolts (GM #11570167), and engine oil & filter.
- Tools Required: Torque wrench in inch-pounds (in-lbs), standard socket set, cleaning supplies for the block surface.
- Removal & Cleaning
- Remove the intake manifold to access the VLOM assembly.
- Remove the eight (8) VLOM tray mounting bolts. Carefully lift the tray and valve lifter oil manifold from the block.
- Thoroughly clean the sealing surface on the cylinder block. All old RTV sealant and debris must be removed.
- Installation & Critical Torque Sequence
- Place the new VLOM gasket tray onto the block. It seats over alignment dowels.
- Install the eight mounting bolts finger-tight.
- Using a torque wrench set to INCH-POUNDS, tighten bolts in the sequence shown in the service manual. The final specification is 89 in-lbs (approximately 7.4 ft-lbs).
- Warning: Overtorquing these small bolts will crack the plastic tray, leading to immediate failure. This is the most common installer error.
- Reassembly & Verification
- Reinstall the valve lifter oil manifold and solenoid assemblies onto the tray.
- Replace the intake manifold with new gaskets.
- Refill with fresh engine oil (typically 6-8 quarts). Start the engine and monitor oil pressure. At operating temperature, idle pressure should be 25-40 psi.
- Total job labor time for a proficient technician: 2.5 to 3.5 hours.
Final Cost Estimate: Parts (~$150-$200 with gaskets and oil) + Labor (3 hours at ~$150/hr shop rate) = $600 – $650 total. Failure to correctly torque the VLOM tray often results in a repeat repair and potential engine damage costing thousands.
Cost
As a master technician, the VLOM (Valve Lifter Oil Manifold) gasket tray torque procedure is a critical repair for GM’s Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) systems on Silverado engines, primarily the 5.3L and 6.2L V8s (RPO codes L83, L84, L87). Failure here causes lifter bore oil starvation, leading to collapsed lifters and catastrophic engine damage.
| Item | Specification / Part Number | Estimated Cost | Notes |
|---|---|---|---|
| VLOM Gasket / Tray Kit | GM #12674533 (Kit includes gaskets & bolts) | $45 – $65 | Must use updated GM kit. Reusing old bolts or gaskets will cause failure. |
| Labor (Dealer/Shop) | 5.0 – 6.5 hours | $750 – $1,100 | Includes manifold removal, cleaning, proper torquing of 21 bolts in sequence to 62 lb-in (5.2 lb-ft). Critical to use inch-pound torque wrench. |
| Additional Parts (Often Required) | Intake Manifold Gaskets (GM #12674766), Valley Cover Gasket | $80 – $120 | Intake manifold must be removed. Replacing these gaskets is highly recommended. |
| Oil & Filter Change | 6-8 qts Dexos1/Dexos2 oil, Filter | $70 – $100 | Mandatory after repair to remove any debris from failed components. |
| Potential Additional Cost (If Lifters Failed) | Lifter Kit (e.g., GM #12688068 for one bank), Labor (15+ hours) | $3,500 – $6,000+ | If the VLOM failure has already caused lifter tick or collapse, this becomes a major engine repair. |
| Total Estimated Repair (VLOM Only) | Parts & Labor | $950 – $1,400 | This is the preventative or early-stage repair cost. Addressing it promptly is far cheaper than engine replacement. |
Technician Note: The key is the precise, three-step torque sequence to 62 lb-in. Over-torquing distorts the tray, causing immediate oil leaks and lifter failure. This repair is often performed alongside AFM/DFM disabler installations or as a preventative measure on higher-mileage trucks (80k+ miles). Always clear any related DTCs after reassembly.
*Note: These costs are 2026 estimates based on market research. Final repair costs will vary by location, shop rates, and vehicle condition. Always contact your local certified mechanic or dealer for an exact quote.
Fix
As a master technician, the VLOM (Valve Lifter Oil Manifold) gasket tray is a critical repair on GM’s 5.3L, 6.2L, and other V8 engines found in Silverados. A leaking tray causes low oil pressure and lifter failure. Here is the factory-approved procedure.
- Safety & Preparation: Disconnect the negative battery cable. Drain the engine coolant from the block. Remove the intake manifold to access the valley cover.
- Access the VLOM: Remove the high-pressure fuel pump (if equipped), fuel lines, and wiring harnesses as needed. Unbolt and remove the metal engine valley cover.
- Remove Old Tray & Clean: Remove the eight (8) VLOM mounting bolts (Torx T30) in a criss-cross pattern. Lift the VLOM assembly straight up. Thoroughly clean the sealing surfaces on the block and VLOM with a plastic scraper and GM-approved cleaner. Any debris left behind will cause a new leak.
- Install New Gasket Tray: Install the new gasket tray (GM Part # 12674564) onto the engine block. It only fits one way. Do not use any sealant.
- Torque VLOM Bolts: This is the most critical step. Reinstall the VLOM assembly. Hand-thread all eight bolts. Using a calibrated inch-pound torque wrench, tighten in the sequence shown in the service manual to 89 INCH-LBS (approx. 7.4 FT-LBS). This is a VERY light torque. Over-torquing will distort the tray and cause an immediate leak.
- Reassembly: Install a new valley cover gasket (GM Part # 12674566). Reinstall all removed components, including the intake manifold with new intake gaskets (GM Part # 12674744 is common).
- Final Steps: Refill coolant. Reconnect the battery. Prime the oil system by cranking the engine with the fuel pump fuse removed for 10-second intervals until oil pressure builds. Start the engine, check for leaks, and verify oil pressure.
Important Note: This job requires significant disassembly. Book time is approximately 4.5 to 6.0 hours of labor. Parts cost is around $120-$180 for OEM gaskets and seals. If the VLOM solenoids are being replaced, add part number 12674565 and 0.3 hours.
Prevention
As a master technician, preventing VLOM (Valve Lifter Oil Manifold) gasket failure on GM’s AFM/DOD engines is critical. The core strategy is maintaining clean oil and correct pressure to prevent the tray from warping or the gasket from failing. Here are the essential maintenance strategies:
- Strict Oil Change Intervals: Use only Dexos1 Gen 2 or Gen 3 approved full-synthetic oil (like GM part number 19370453) every 5,000 miles or less, especially if you do short trips or tow. Sludge is the primary enemy of the VLOM’s small oil passages.
- High-Quality Oil Filter: Always use an AC Delco PF63E or equivalent. Cheap filters can allow debris to circulate and clog the VLOM solenoids, leading to pressure issues that stress the gasket.
- Monitor Oil Pressure: Use the truck’s driver information center or a scan tool to watch oil pressure. A consistent drop at idle when hot (below 20 psi) can indicate wear or VLOM issues. Diagnose early.
- Address “Lifter Tick” Immediately: Any tapping noise from the engine valley, especially at startup, indicates AFM lifter or VLOM problems. Ignoring it can lead to complete gasket blow-out and catastrophic engine failure.
- Consider an AFM Disabler: Devices like a Range AFM Disabler can deactivate the cylinder deactivation system, reducing the constant cycling of the VLOM solenoids and lifters, which is a major contributor to failure.
- Use Engine Flush with Caution: If the engine has a history of poor maintenance, a gentle solvent-based flush before an oil change can help clear passages. However, aggressive flushes on high-mileage engines can dislodge debris and cause immediate blockage.
- Proactive Replacement: If you are performing other top-end work (e.g., thermostat, valley cover), proactively replace the VLOM gasket (GM part number 12674565) and tray. Torque the tray bolts in the correct sequence to 89 in-lbs (about 7.4 ft-lbs)—over-torquing is a common mistake that warps the tray.
Following these strategies focuses on oil system integrity, which is the root cause of 90% of VLOM gasket and lifter failures in the 5.3L and 6.2L engines.
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Real Owner Discussions
“Every single cold morning my 91k-mile Silverado with the 5.3L develops a lifter tick for exactly the first three minutes until the oil warms up and I’m convinced it’s that damn VLOM tray gasket weeping pressure.”
“My 2019 Silverado with just over 46k miles has the classic cold start lifter tick, and I’m wondering if a backyard mechanic like me can tackle the VLOM gasket tray replacement with just a torque wrench and some patience.”
“Just got a $1,800 quote from the dealer to replace the VLOM gasket tray on my 2014 with 148k miles because they claim it needs a whole new assembly and programming, which feels like a total scam for a $40 part and an hour of labor.”
*Real discussions sourced from Silverado owners online.
❓ Frequently Asked Questions
5 Common 2018 Silverado 8-Speed Transmission VLOM Gasket Questions
Q1: What is the VLOM gasket tray, and why is it failing on my 2018 Silverado’s 8-speed?
A1: The Valve Lifter Oil Manifold (VLOM) gasket tray is a plastic and rubber assembly (GM part # 12674533) that seals the oil passages between the engine block and the VLOM. In the 2018 model year with the 5.3L or 6.2L V8, these gaskets are prone to degradation, causing external oil leaks. The failure is often due to material incompatibility with certain engine oils, leading to swelling and loss of seal.
Q2: What is the correct torque sequence and specification for the VLOM gasket tray bolts?
A2: The critical specification is 8 lb-ft (106 in-lb). You must use a calibrated inch-pound torque wrench. The sequence is a star pattern, starting with the four inner bolts that secure the tray itself, followed by the outer bolts for the VLOM assembly. Overtorquing will crack the plastic tray, leading to a major oil leak and requiring a new tray (another ~$45 for part # 12674533).
Q3: How much does it cost to have a dealer fix this VLOM gasket leak?
A3: Dealership repair typically costs between $600 and $900. The part (gasket tray # 12674533) is relatively inexpensive at ~$45, but labor is the major cost. The job is billed at approximately 3.5 to 4.5 hours of labor due to the need to remove the intake manifold, fuel lines, and other components to access the VLOM on top of the engine.
Q4: Can I just replace the gasket tray, or do I need to replace the entire VLOM assembly?
A4: In most cases, you only need to replace the gasket tray (part # 12674533). However, you must inspect the VLOM assembly itself for cracks or damage. If the VLOM is damaged, the assembly (GM part # 12672809 for the 5.3L) costs around $450. Always replace the two VLOM mounting bolts as they are torque-to-yield; the GM bolt kit is part # 12658052.
Q5: Is this leak a serious threat to my engine, or can I drive with it for a while?
A5: You should address it promptly. While it often starts as a slow seep, it can develop into a significant leak, leading to low oil pressure. Low oil pressure can cause catastrophic engine damage from insufficient lubrication to the lifters and bearings. Do not ignore it. Check your oil level frequently if you must drive it before repair.
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Not Professional Advice: SilveradoFix.com content is for informational and educational purposes only. We are not providing professional mechanical, legal, or financial advice. Always consult a certified mechanic before attempting any repairs.
Cost Estimates: All prices, part costs, and labor times are 2026 estimates based on market research and owner reports. Actual costs vary significantly by location, shop rates, and vehicle condition.
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Emissions Warning: Modifications like AFM/DOD deletes may affect emissions system compliance and could be illegal in some states. Check local regulations.