Camshaft oil seal. Porsche 911 74-89 / 930 Turbo / 964 Turbo › 99970146840

The Porsche Camshaft Oil Seal – OE Match (Part Number: 99970146840/1) is a replacement sealing component designed to prevent engine oil leakage around the camshaft housing assembly on selected classic Porsche 911, 930 Turbo and 964 Turbo models.

• Porsche 911 1974-89
• Porsche 930 Turbo 1975-89
• Porsche 964 Turbo 3.3L 1991-92

Measuring 67.5 x 75.4 x 4mm, this precision-sized O-ring seal provides an effective oil-tight barrier between mating engine components, helping maintain proper engine lubrication and preventing unwanted oil seepage.

Designed to match the original Porsche component's dimensions and fitment, this OE Match replacement offers a cost-effective alternative to a Genuine Porsche-branded seal.

Over time, original camshaft seals can become hardened, flattened, brittle or damaged due to continuous exposure to engine heat, oil and ageing. This deterioration can compromise the sealing surface, allowing oil to escape from the camshaft housing area.

Ideal for routine engine maintenance, camshaft housing repairs, gasket replacement or classic Porsche engine restoration, this OE Match seal helps restore reliable sealing and maintain engine cleanliness.

What This Product Does:
The camshaft oil seal is an important component of the engine's lubrication sealing system. It forms a secure seal around the camshaft flange or associated housing interface, preventing engine oil from escaping through the joint between mating components.

While the camshaft operates within the engine, oil is circulated to lubricate moving parts, reducing friction and protecting components against premature wear. The camshaft oil seal helps contain this oil within the intended lubrication areas.

Its main functions include:

• Preventing engine oil leaks: Creates a reliable sealing barrier around the camshaft housing or flange assembly.
• Maintaining oil containment: Helps keep lubricating oil within the engine rather than allowing it to escape through housing joints.
• Protecting surrounding components: Reduces the risk of oil contamination on adjacent engine parts.
• Supporting engine lubrication: Helps preserve the integrity of the lubrication system by minimising external oil loss.
• Maintaining engine cleanliness: Prevents oil seepage that can attract dust, dirt and debris.
• Preserving original engine functionality: Maintains the sealing arrangement designed for classic Porsche engines.

Common symptoms of a worn or failing camshaft oil seal include:

• Visible engine oil leaks: Oil may seep from the camshaft housing or flange area, leaving wet patches or oil residue around the engine.
• Oil stains beneath the vehicle: Oil escaping from the sealing area may travel down the engine casing and eventually drip onto the ground.
• Burning oil smell: Leaking oil may reach hot engine or exhaust components, producing a noticeable burning oil odour.
• Smoke from the engine area: Oil contacting hot exhaust components may generate smoke, particularly after the engine reaches operating temperature.
• Hardened or brittle sealing material: Age and heat exposure can cause the seal to lose flexibility, preventing it from maintaining an effective seal.
• Flattened or deformed seal: Continuous compression may cause the O-ring to lose its original profile and sealing capability.
• Increased oil consumption: External oil leakage may contribute to a gradual reduction in engine oil level.
• Oil and dirt accumulation: Oil seepage around the camshaft housing may attract dirt, resulting in greasy deposits.

A damaged or hardened seal can allow engine oil to escape from the camshaft housing assembly. If left unresolved, continued leakage may lead to oil loss, contamination of surrounding components and increased maintenance requirements.

Oil leaking onto hot exhaust components can also produce unpleasant odours, smoke and potential safety concerns.

Installing a replacement OE Match camshaft oil seal helps to:

• Restore oil-tight sealing: Provide an effective barrier against oil leakage around the camshaft housing assembly.
• Prevent further oil loss: Reduce external oil seepage and help maintain correct engine oil levels.
• Protect engine components: Minimise oil contamination around nearby mechanical and electrical parts.
• Reduce burning oil smells: Help prevent leaking oil from reaching hot engine and exhaust surfaces.
• Maintain engine cleanliness: Eliminate oil seepage that can attract dirt and debris.
• Support long-term engine reliability: Preserve the integrity of the engine's lubrication sealing system.
• Assist with engine restoration: Restore the original sealing arrangement during rebuilding or maintenance.
• Provide a cost-effective repair: Offer an OE Match replacement alternative to the Genuine Porsche component.

Replacing the seal during camshaft housing servicing, engine gasket replacement or major engine maintenance is recommended whenever the original seal shows signs of wear, hardening or damage.