Hydraulic valve tappet. Porsche 993 Carrera / 993 Carrera RS  ›  99310514107

Fits:
Porsche 987 MKI Boxster 2005-08
Porsche 987C MKI Cayman 2006-08
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 997 MKI Carrera 2005-08
Porsche 955 Cayenne S / Turbo 4.5L 2003-06

Click 'Zoom in' for large parts diagram.
Diagram Ref No 5.

OE Match hydraulic exhaust valve tappet 

Fits:

• Porsche Boxster 987 2.7L 2005-08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche 996 C2 3.4L 1997-08/01
• Porsche 996 C4 3.4L 1997-08/01
• Porsche 996 C2 3.6L 09/01-2005
• Porsche 996 C4 3.6L 09/01-2005
• Porsche 996 C4S 3.6L 09/01-2005
• Porsche 996 TURBO 2000-05
• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08
• Porsche 955 Cayenne S 4.5L V8 2003-06
• Porsche 955 Cayenne Turbo 4.5L 2003-06

Check fitment for your specific vehicle (model, year, engine) before ordering.

What This Product Does

The tappet transfers motion from the camshaft to the valve mechanism. Its hydraulic operation depends on the engine's lubrication system, making oil condition and the associated contact surfaces relevant when investigating wear or noise.

Functions

• Transfers camshaft movement to the valve mechanism.
• Supports valve opening in the specified engine application.

Symptoms of Fault

• Persistent ticking or tapping from the valve mechanism.
• Valve-mechanism noise becoming more pronounced as engine speed rises.
• Uneven contact wear found during inspection.
• Rough running or misfires where valve movement is affected.

Why Replacement Matters

A worn tappet can affect valve movement and contribute to abnormal contact with neighbouring components. Establish the cause before replacement, checking lubrication and camshaft condition rather than assuming every ticking noise originates from a tappet.

FAQs

Can oil condition affect hydraulic tappets?
Contaminated oil can cause hydraulic elements to stick. Include lubrication checks in the diagnosis.

Should the camshaft also be checked?
Inspect the cam lobes and tappet contact surfaces together, as wear may affect both components.

Support & Advice

The requested source could not be retrieved. Matching search descriptions were found, but they did not establish the linked product's exact brand or version; this copy therefore uses the supplied product information.

LIQUI MOLY Hydraulic Lifter Additive – 300ml

LIQUI MOLY Hydraulic Lifter Additive is an engine oil treatment designed to reduce noisy hydraulic tappets and improve the operation of oil-fed valve train components.

Its cleaning formula helps remove deposits from oil passages and valve bores, supporting smoother engine operation and improving the function of oil-pressure-operated timing chain tensioners.

What Does It Do?

The additive cleans oil passages and valve bores, helping hydraulic lifters operate correctly. It may also reduce noise from oil-pressure-operated timing chain tensioners.

Why Do Hydraulic Lifters Become Noisy?

Common causes include:

• Deposits restricting oil passages
• Contaminated or ageing engine oil
• Poor lubrication during cold starts
• Low engine oil pressure
• Internal lifter wear

When Should It Be Used?

Use when hydraulic tappet noise may be caused by deposits or restricted oil flow.

It can be added during routine servicing. Persistent mechanical noise requires diagnosis, as additives cannot repair worn or damaged components.

Application & Dosage

• Add directly to the engine oil.
• One 300ml container treats up to 6 litres of oil.
• Adjust the dosage proportionally for larger oil capacities.
• Can be added at any time.
• Warm the engine after adding.
• LIQUI MOLY recommends use after each oil change for a lasting effect.

Key Features

• Helps reduce hydraulic tappet noise
• Cleans oil passages and valve bores
• Improves engine oil lubrication properties
• Supports oil-pressure-operated timing chain tensioners
• Suitable for compatible petrol and diesel engines
• Tested for turbochargers and catalytic converters
• Suitable for engines with diesel particulate filters
• Compatible with commercially available engine oils
• 300ml container

LIQUI MOLY Hydraulic Lifter Additives for Porsche Engines

Hydraulic lifters rely on clean engine oil and unrestricted oil passages for reliable operation.

LIQUI MOLY Hydraulic Lifter Additive helps remove deposits that can contribute to noisy tappets and restricted lubrication in compatible Porsche petrol and diesel engines.

Design911 supplies LIQUI MOLY engine additives, lubricants, oil filters and Porsche maintenance products.