Specification Brand : MainUseool BulletPoint1 : Precise TDC Detection: The TDC whistle produces a clear, audible sound as the piston approaches top dead center (TDC) during the compression stroke—stopping right when TDC is reached. This makes it easy to pinpoint TDC for ignition timing, valve adjustments, and cylinder diagnostics BulletPoint2 : Compatible with 14mm & 18mm Spark Plug Ports: Top dead center tool features a dual-size threaded fitting that easily installs into both 14mm and 18mm spark plug holes—compatible with most gasoline engines. Not for use on diesel engines BulletPoint3 : Versatile Applications for Engine Work: Top dead center whistle perfect for distributor installation, individual cylinder valve setting, timing belt or chain inspection, and cylinder leak down testing—essential for mechanics and DIYers alike BulletPoint4 : Quick, Tool-Free Installation: No tools required—just hand-thread the TDC whistle into the spark plug port and you're ready to go. The 27-inch overall length makes it easy to position and hear, even in tight engine bays BulletPoint5 : Audible Compression Stroke Indicator: The TDC whistle tool makes it easy to detect the compression stroke by ear—no need to visually inspect pistons or rely solely on timing marks. MainUseool TDC compression indicator perfect for both beginners and professional mechanics BulletPoint6 : Widely used in fenders, front bumpers, bumpers, license plate frames, bodywork, under the hood and other places BulletPoint7 : Impact grade 6-point socket BulletPoint8 : Extra deep to fit various axle lengths BulletPoint9 : Lifetime Warranty Color : wine red CompatibleFastenerDescription : 0.5 inches CustomerPackageType : Standard Packaging DriveSystem : Nutsetter ExteriorFinish : anodizing ExternallyAssignedProductIdentifier1 : 840129903550 ExternallyAssignedProductIdentifier2 : 0840129903550 ExternallyAssignedProductIdentifier3 : 00028907102382 FinishType : Powder Coated GpsrSafetyAttestation : 1 IncludedComponents : TDC whistle + Spare Pair of O-rings + User Manual ItemLength : 90 millimeters ItemName : Top Dead Center Tool 8016MRG TDC Whistle – Universal Top Dead Center Indicator with 14mm/18mm Spark Plug Ports – Top Dead Center Whistle for Distributor Installation, Timing & Valve Adjustment ItemPackageDimensions_Height : 19.6088 centimeters ItemPackageDimensions_Length : 1.6002 centimeters ItemPackageDimensions_Width : 15.0876 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : spark-plug-and-ignition-tools Manufacturer : MainUseool Material : Chrome Molybdenum Steel Material1 : Aluminum Material2 : Stainless Steel MetalType : Aluminum ModelName : Crush Sleeve Eliminator Kit for GM 8.5/Chrysler 9.25 Differential ModelNumber : LSK2024-003 NumberOfBoxes : 1 NumberOfItems : 1 NumberOfPieces : 20 OemEquivalentPartNumber : SKCSGM8.5 PackageLevel : unit PartNumber : 8016MRG/33650 PartTypeId : 11624 ProductDescription : Take the guesswork out of engine timing with the 8016MRG TDC Whistle—a simple yet highly effective tool designed to help you locate Top Dead Center (TDC) quickly and accurately. Whether you're installing a distributor, adjusting valves, or inspecting the timing belt or chain, this TDC whistle tool offers an audible cue during the compression stroke and stops whistling the moment the piston reaches TDC. No need to remove valve covers or interpret unclear timing marks—the sound does the work for you. Compatible with most gasoline engines, the top dead center tool features a dual-threaded fitting for 14mm and 18mm spark plug ports. Just hand-thread it into the spark plug hole, rotate the crankshaft in the normal direction, and listen for the whistle. It’s that easy. Built with a 27-inch length for convenience and easy handling, this top dead center whistle is perfect for both beginners and professional mechanics looking for a reliable way to verify TDC during engine service. Important Safety Notes: Ensure the engine is off and cool before using this tool. Avoid contact between the rubber hose and hot engine parts. Keep hands away from rotating or moving components. Always follow your vehicle manufacturer’s service procedures. Note: This TDC indicator is intended for use on gasoline engines only. Not suitable for diesel engines ProductSiteLaunchDate : 2025-04-16T11:49:22.929Z Size : 18mmx6.4mmx4.2mm Style : 6-Point Socket SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable UnitCount : 20 UnspscCode : 40141600 WarrantyDescription : Warranty WasherType : Fender