Injector Cup O-rings, 2 Pack, LB7 Duramax 2001-2004

These injector cup O-rings replace GM 94051259 on the 6.6 Liter Duramax LB7. On the LB7, each injector sits in a cup that passes through the coolant jacket in the cylinder head, and the O-rings seal coolant away from the injector bore. Damaged or hardened cup O-rings allow cross-contamination, letting coolant into the engine oil.

This 2 pack services one injector cup.

Key Features

• Replaces GM 94051259
• 2 O-rings, enough for one injector cup
• 16 required per engine (2 per cup)
• LB7 only

Benefits

Coolant in the oil can destroy bearings quickly, and a leaking injector cup is one of the LB7's known causes. Replace the cup O-rings any time an injector cup is removed, or when diagnosing coolant loss with no external leak. Replace if worn or damaged.

Commonly replaced at the same time: Injector Cup Sealant, Duramax 2001 - 2004.

Frequently Asked Questions

How many do I need?

Each injector cup uses 2 O-rings, so this pack does one cup. For all 8 cups, the Injector Cup O-ring Kit, Duramax 2001 - 2004 includes all 16.

Will these fit my LLY or later Duramax?

No. These are for the LB7 injector cups only.

Fitment

Fits 2001-2004 Chevrolet Silverado and GMC Sierra 2500HD and 3500 with the 6.6 Liter Duramax LB7. 2 O-rings per injector cup, 16 per engine.

What's Included

• (2) LB7 injector cup O-rings

For warranty information or to submit a claim, see our Warranty Form.

Details:

• Engine Manufacturer: Duramax
• Liter: 6.6 Liter
• Engine Designation: LB7
• Engine Years: 2001-2004

Applications:

• 2001-2004 Silverado/Sierra 2500HD/3500HD LB7