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<h2>What does a timing cover do?</h2>A ​timing cover​ is a protective shield enclosing the timing belt or chain in an internal combustion engine. Its primary role is to retain lubricating oil, ensuring minimal friction and wear on moving parts like the belt or chain. This prevents slippage, which could disrupt valve/piston timing and cause severe engine damage. The cover also blocks dirt, dust, and debris from entering the timing system, avoiding abrasive wear that accelerates component failure. Additionally, it dampens high-frequency noise from the timing components for a quieter engine operation and reduces the risk of accidental injury to mechanics during maintenance by covering sharp or fast-moving parts.Made from durable materials like aluminum, steel, or reinforced polymers, the timing cover provides structural support in some designs, maintaining alignment of critical components. Over time, wear, rust, or cracks in the cover can lead to oil leaks, contamination, or component misalignment. Regular inspections during maintenance are crucial to catch these issues early, as neglect might result in costly repairs, such as valve damage or complete engine failure. In short, the timing cover safeguards engine performance, longevity, and safety through simple yet vital protection.<h2>How to identify a failing timing cover</h2>A failing timing cover can lead to serious engine issues if left unchecked. Here&rsquo;s how to identify potential problems early:​1. Visible Signs of Damage​Look for cracks, rust, or warping on the timing cover. Over time, exposure to heat, moisture, or road debris can weaken the material. If the cover is cracked, oil may leak, or debris could enter the timing system.​2. Oil Leaks​Check for dark oil stains or puddles under the engine, near the front of the cylinder block. A failing timing cover often fails to seal lubricant properly, leading to low oil levels or pooling around the timing area. Low oil can cause the timing belt/chain to slip or wear prematurely.​3. Unusual Engine Noises​Listen for whining, grinding, or rattling sounds coming from the timing zone (near the crankshaft or water pump). Worn or loose components (e.g., a dry, misaligned timing belt) often produce noise due to friction or lack of lubrication.​4. Engine Performance Problems​A compromised timing cover may allow contaminants (dirt, sand) to reach the timing belt/chain, causing misalignment or slippage. This disrupts valve timing, leading to symptoms like rough idling, stalling, misfires, or hesitation during acceleration. In severe cases, it can bend valves or damage pistons.​5. Contaminated Timing Components​During inspection, if the timing belt/chain appears dirty, frayed, or has missing teeth, the cover may not be sealing debris out. Debris buildup accelerates wear on these critical parts.6. Maintenance Alerts​If your vehicle&rsquo;s check engine light triggers, especially with codes related to valve timing (e.g., P0016 for camshaft/crankshaft alignment), it could signal indirect issues caused by a failing timing cover.What to do next?<ol><li>Inspect regularly: Check the timing cover during routine oil changes or engine services.</li><li>Address leaks promptly: Fix oil leaks immediately to prevent damage to the timing system.</li><li>Replace if necessary: If the cover is cracked, rusted, or damaged, replace it along with any worn timing components (belt/chain) to avoid chain reactions.</li></ol>Ignoring a failing timing cover risks catastrophic engine failure, especially in interference engines (where valves and pistons share space). Catching issues early saves time and money!<h2>Need a replacement timing cover? Look A-Premium!</h2>If you&rsquo;re experiencing oil leaks, strange noises, or erratic engine performance, your timing cover might be failing. Don&rsquo;t let this critical component compromise your vehicle&rsquo;s safety or longevity&mdash;replace it today before minor issues escalate into catastrophic engine damage.Visit A-Premium.com to find ​high-quality timing covers​ tailored for your make and model. Our selection includes durable, OEM-approved parts designed to fit seamlessly into your engine. Plus, enjoy:<ul><li>Fast shipping: Get your parts delivered quickly, so you can get back on the road.</li><li>Expert support: Our team is ready to help you troubleshoot or confirm your needs via phone/email.</li><li>Competitive pricing: Save on repairs without skimping on quality.</li></ul>

Timing Cover

Air Cleaner

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Air Filter Box

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Mass Air Flow Sensors/Car MAF Sensors | A-Premium

Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Air Intake Resonator

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

Intake Manifold Repair Bracket

Intake Manifold Runner Control Valve

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Intercooler

Intercooler Hose

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Oxygen Sensor

Car Oxygen Sensor Price From $24.99 | A-Premium

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Pressure Sensor

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Supercharger Pulley Drive Unit

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Supercharger Snout Rebuild Kit

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Throttle Body

Throttle Cable

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Throttle Position Sensor

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Turbocharger

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Turbocharger Gasket Kit

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

Camshaft Kit

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Camshaft Timing Gear

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Camshafts

Chain Tensioner Adjuster

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Cylinder Head

Cylinder Head Assembly

Eccentric Shaft Actuator

Engine Timing Belt

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Engine Valve Cover

Engine Valve Cover Gasket

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Harmonic Balancer

Rocker Arm

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Rocker Arm Shaft Lifter Assembly

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Timing Belt Kit

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Timing Chain Gear

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Timing Chain Kit

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Timing-Control Valve Solenoid

Valve Cover Gasket

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Valve Lifter Guides

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crank Installer Tool

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

Crankshaft Pulley

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Engine Oil Dipstick

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

Harmonic Balancer Crankshaft Hub

Knock Sensor

Oil Baffle

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Oil Cooler

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Oil Cooler Line

Oil Drip Pan

Oil Filler Cap

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Oil Filter

Oil Filter Base

Oil Filter Cover

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

Oil Separator

Serpentine Belt

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

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Electronic Ignition System

Engine Valve Covers & Ignition Coils Kits

Glow Plug

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Glow Plug Relay Module

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Ignition Coil

Ignition Coils & Spark Plugs & Wires Kits

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Ignition Coils & Spark Plugs Kits

Ignition Coils & Wires Kits

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Ignition Distributor

Ignition Lock Cylinder

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Ignition Starter Switch

Ignition Switch Actuator

Kill Switch

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Pulley

Engine Components & Accessories

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Active Grille Shutter Actuator

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Auxiliary Water Pump

Drive Motor Inverter Cooler

Electric Engine Water Pump

Engine Coolant Air Bleeder Valve

Engine Coolant Pipe

Engine Coolant Shut Off Valve

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Expansion Tank

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Expansion Tank Mounting Plate

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Fan Pulley Bracket

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Fuel Cooler

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Overflow Hose Connector

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Radiator

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Radiator Control Fan Module

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Radiator Core Support Skid Bar Plate

Radiator Fan Cooling Motor

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Radiator Hose

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Radiator Support Assembly

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Engine Cooling

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

Nissan D21 Timing Cover