2011/09/27 Caterpillar

Engine:

G3508 (S/N: 9TG1-UP; WPM1-UP; WPN1-UP)

G3512 (S/N: 7NJ1-UP; WPP1-UP; WPR1-UP)

ReferenceSpecial Instruction, REHS7134, "Retrofitting for Ultra Lean Burn (ULB) on a G3508 Engine"

ReferenceSpecial Instruction, REHS7135, "Retrofitting for Ultra Lean Burn (ULB) on a G3512 Engine"

Parts and Special Instructions are available for the conversion of the above G3508 and G3512 Engines into a new configuration that offers the following benefits:

• Enhanced power density

• Reduced emissions

• Application flexibility

• Fuel efficiency

The benefits are achieved by upgraded for emission levels not to exceed 0.5 or 1.0 g/hp-hr NO_x.

The ULB engine upgrade is adaptable to the above engines back to first production.

A list of parts for your particular engine arrangement can be found at the following URL:

On the web site, click the applicable link that says "G3508 ULB Upgrade - Parts to Order" or "G3512 ULB Upgrade - Parts to Order".

For more information, refer to the references that are listed above.