NSK 70TB0803 Engine Timing Belt Idler

OE-Style Timing Belt Idler for Select Honda and Isuzu

The NSK 70TB0803 engine timing belt idler is built for precise belt guidance in select Acura, Honda, and Isuzu applications. It combines vehicle-specific fitment with low-friction bearing performance to support stable timing belt operation in demanding engine environments.

Key Features

• Premium OE technology with vehicle-specific fit, form, and performance
• Long-life, low-friction bearing with a superfinished, precision-matched raceway
• Advanced multi-lip seal design for resistance to water and contamination
• Sealed-for-life construction with premium all-weather grease for zero maintenance
• NSK engineering backed by global OE manufacturing experience

Detailed Description

NSK 70TB0803 is an engine timing belt idler designed to maintain proper belt routing and tension stability in the valve train system. The bearing uses precision raceway finishing to reduce friction and support smooth rotation, while the multi-lip sealing system helps keep out moisture and debris. With an inside diameter of 10.3 mm, outside diameter of 70 mm, 54.8 mm inner race width, and 36.6 mm outer race width, this idler is built for accurate replacement fitment on the listed vehicles. It fits 1996-1997 Acura SLX, 1994-1997 Honda Passport, and 1992-1997 Isuzu Trooper. This part number, 70TB0803, is a direct-fit timing belt idler for these applications and is commonly searched alongside Honda Passport timing belt idler and Isuzu Trooper engine timing belt idler replacement terms.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What This Part Helps Address

• Timing belt noise caused by a worn or rough idler bearing
• Belt tracking issues from an idler that no longer rotates smoothly
• Contamination-related wear from failed sealing surfaces
• Premature timing belt service caused by degraded idler performance
• Engine timing instability linked to excessive bearing friction

Installation Notes and Tips

Replace the timing belt idler during timing belt service to help maintain consistent belt alignment and rotation. Inspect the belt path, adjacent pulleys, and sealing surfaces before installation, and verify the part number 70TB0803 against the vehicle application before assembly. Proper torque and timing procedures should be followed according to the service manual for the Acura SLX, Honda Passport, or Isuzu Trooper.

Quality Assurance

NSK is a global manufacturer of rolling bearing products and supplies components to major automotive OEMs and suppliers. The 70TB0803 reflects that OE-focused engineering approach with sealed-for-life bearing construction and contamination-resistant sealing for dependable service in engine timing applications.