ACDelco HL120 - Engine Hydraulic Valve Adjuster/Valve Lifter

Signs of Wear & Troubleshooting

• Signs of wear for engine valve lifters include but are not limited to:
• Tapping noises from the engine
• Loss of power
• Engine misfire
• Poor engine performance
• Excessive noise in the valve train

Good Maintenance Practices

• Before purchasing and installing an engine valve lifter, make sure it is the correct size and fit for your vehicle.
• Keep the coolant level full and do not allow the engine to overheat - excessive heat could cause the lifter to expand and stick.
• Keep engine oil level full.
• Be sure that flat non-roller lifters turn in their bores at least 45 degrees in 2 crankshaft revolutions, to help prevent camshaft lobe damage.
• If a tapping sound occurs in the engine, have it checked - it could be a sign of a faulty lifter and lead to excessive damage to engine components.
• Have your vehicle inspected as soon as possible if the ‘Service Engine Soon' light illuminates.
• Have your vehicle inspected immediately if the ‘Service Engine Soon' light flashes rapidly, as this could indicate an engine misfire condition which may damage your engine and/or engine emission components.
• Regularly inspect engine valve lifter for signs of damage or wear, and replace them if signs of damage are found.