Autolite 1103 Diesel Glow Plug

Diesel Glow Plug Overview

Autolite 1103 is a diesel glow plug built for dependable cold-start performance and long service life. It delivers concentrated heat for diesel engines in passenger cars and light trucks, with fitment for select Mercedes-Benz diesel applications.

Key Features

• Copper glow plug material for consistent heat transfer.
• 120W, 11V rating for diesel starting performance.
• 12mm thread size with 12mm hex size.
• 2.91 in. (74 mm) overall length.
• 10-second pre-heating time.
• Autolite 1103 part number for accurate ordering and replacement.

Detailed Description

This Autolite diesel glow plug is engineered around OE-style form, fit, and function for diesel starting systems that require a 12mm x 1.25 thread and 8mm hex connector type. The copper construction and 120W 11V rating support fast heat buildup, while the 10-second pre-heating specification helps the plug reach operating temperature quickly. It is a direct replacement choice for Mercedes-Benz 300D, 300SDL, 300TD, and 300SD diesel applications listed in the fitment data. This part number, 1103, is also referenced as 30G and 2237 for the same application.

What It Helps Address

• Hard starting in diesel engines during cold weather.
• Slow glow plug heat-up before engine start.
• Replacement needs for worn or failed diesel glow plugs.
• Fitment concerns when matching thread size, hex size, and length.

Installation Notes and Tips

Verify thread size, hex size, connector type, and overall length before installation. Confirm the vehicle uses the listed diesel glow plug application and follow the service manual for torque and electrical connection procedures. Inspect the glow plug circuit and related components if starting issues continue after replacement.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with a focus on OE form, fit, and function. Part number 1103 is built for diesel applications where dependable starting performance matters.