This set of 8 replacement glow plug terminal nuts secures the glow plug wiring to the terminal on each glow plug. New ACDelco glow plugs for the LLY, LBZ, LMM and LML Duramax do not come with terminal nuts, so you'll need a set to finish the job. The old nuts are small, easy to drop into the engine valley, and often corroded or seized after years of heat. These M4 x 0.7 serrated flange nuts grip the terminal to keep the connection tight, so each glow plug gets full power for reliable cold starts.
Key Features
- Set of 8: one for every glow plug
- M4 x 0.7 thread
- Serrated flange resists loosening from heat and vibration
- Required for new ACDelco LLY, LBZ, LMM and LML glow plugs, which don't include nuts
Benefits
- Finish a glow plug job without reusing old, corroded nuts
- Keeps a tight electrical connection at every glow plug
- Inexpensive spares in case one drops into the engine
Frequently Asked Questions
Do new glow plugs come with nuts?
New ACDelco glow plugs for the LLY, LBZ, LMM and LML do not include terminal nuts, so order this set with your glow plugs. New LB7 glow plugs already come with nuts.
What size are the nuts?
They are M4 x 0.7 serrated flange nuts.
Can I reuse my old nuts?
You can if they're in good shape, but old nuts are often corroded or seized from engine heat, and they're easy to lose during the job. A new set is cheap insurance for a solid connection.
How many do I need?
One per glow plug. This set of 8 covers every cylinder on a 6.6L Duramax.
Fitment
- 2004.5–2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax (LLY, LBZ, LMM, LML)
- 2004.5–2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax (LLY, LBZ, LMM, LML)
- Also listed for 2001–2004 LB7, 2017–2025 L5P, 2006–2022 Express/Savana vans, 2016–2022 Colorado/Canyon 2.8L and 2020–2024 Silverado/Sierra 1500 3.0L
Replacing glow plugs? See the ACDelco Glow Plug for 2004.5–2005 LLY or 2006–2016 LBZ, LMM, LML, the Deluxe Glow Plug Replacement Kit for 2004.5–2005 or 2006–2016, and our Glow Plug Removal Tool Kit.
What's Included
- (8) M4 x 0.7 serrated flange glow plug terminal nuts
