NGK 97788 Diesel Glow Plug

NGK Diesel Glow Plug 97788 Overview

NGK Glow Plug 97788 is a 12-volt diesel glow plug built with a metal-type construction, threaded terminal, flat seat, and OE-equivalent design. It is specified for select 2004-2006 Chevrolet and GMC diesel applications, including Silverado 2500 HD, Silverado 3500, Sierra 2500 HD, Sierra 3500, Express 2500, Express 3500, and Savana 2500/3500 models.

NGK’s OE manufacturing background and North American coverage make this glow plug a direct-fit service part for diesel starting and cold-weather performance needs. Part number 97788 is also identified as Y1032AS.

Key Features

• Diesel glow plug for 12-volt systems
• Metal-type construction for OE-style service replacement
• Threaded terminal with M4 terminal thread size
• Flat seat design
• 12 mm hex size and 0.391 in thread diameter
• Length: 5.39 in
• Cross-reference: Autolite 1113

Detailed Description

NGK 97788 is an OE-equivalent diesel glow plug engineered for specific GM Duramax applications, including 2004-2005 Chevrolet Silverado 2500 HD and Silverado 3500, 2004-2005 GMC Sierra 2500 HD and Sierra 3500, and 2006 Chevrolet Express 2500, Express 3500, Silverado 2500 HD, Silverado 3500, GMC Savana 2500, Savana 3500, Sierra 2500 HD, and Sierra 3500 with the noted LLY engine configuration. If you are searching for a diesel glow plug for a 2006 Chevrolet Silverado 2500 HD or a 2006 GMC Sierra 3500, this part number is listed for those applications.

NGK builds ignition components to original equipment standards, and this glow plug follows the same service-focused approach with the correct voltage, thread, and seat specifications for the listed vehicles. Part number 97788 is a practical replacement choice when restoring reliable diesel cold starts and maintaining proper combustion chamber heat during startup.

What It Helps Address

• Hard starting in cold weather
• Extended cranking before engine start
• Rough diesel startup on listed GM applications
• Glow plug replacement for worn or failed units
• OE-style service on compatible Chevrolet and GMC diesel trucks and vans

Installation Notes and Tips

Verify engine code and glow plug configuration before ordering, especially on 2006 models noted for hex threads located near the top of the glow plug and LLY engine-only fitment. Confirm terminal style, thread diameter, seat type, and overall length against the removed part before installation. Use care during removal and installation to avoid thread damage in the cylinder head.

Quality Assurance

NGK is a long-established OE supplier with extensive North American manufacturing and distribution support. Part number 97788 is produced to original equipment standards for durability and consistent diesel ignition performance in the listed Chevrolet and GMC applications.