Seal the front of your engine properly with this Genuine Nissan Harmonic Crankshaft Seal, designed specifically for GU Y61 Patrol models fitted with TD42T and TD42Ti engines. This OEM seal sits at the front of the crankshaft behind the harmonic balancer, preventing engine oil from leaking out of the timing cover area and ensuring stable lubrication throughout the engine.

Over time, crankshaft seals commonly harden, shrink, or crack due to heat cycles, engine vibration, and age. When this seal begins to fail, it can result in visible oil leaks at the front of the engine, oil contamination around the crank pulley, and gradual oil loss that may lead to more serious engine damage if ignored.

Manufactured to Nissan’s original specifications, this direct-fit replacement ensures accurate sealing, reliable fitment, and long-lasting durability under both on-road and heavy-duty off-road conditions.

Features & Benefits

• Genuine Nissan OEM crankshaft (harmonic balancer) seal for precise fitment
• Designed specifically for Nissan Patrol GU Y61 TD42T and TD42Ti engines
• Seals crankshaft at the front timing cover/harmonic balancer area
• Helps prevent engine oil leaks and maintain correct oil levels
• Heat- and oil-resistant rubber construction for long service life
• Withstands high crankshaft speeds and engine vibration
• Maintains proper engine cleanliness and prevents contamination
• Direct replacement with no modifications required
• Ideal for engine repairs, timing cover work, and preventative maintenance

Vehicle Fitment

Suitable for:

• Nissan Patrol GU Y61 TD42T
• Nissan Patrol GU Y61 TD42Ti 

Please confirm compatibility before purchase or contact us with your VIN for assistance, as seal specifications may vary depending on engine variant and production year.

Common Signs of a Worn Crankshaft Seal

• Oil leaks at the front of the engine behind crank pulley
• Oil spray or misting around harmonic balancer area
• Low engine oil level without obvious external leaks
• Oil contamination on belts or front accessories
• Hardened or cracked seal material during inspection

Replacing a worn harmonic crankshaft seal helps restore proper oil sealing, prevents ongoing oil loss, and protects the long-term reliability of your Patrol’s TD42 engine.