Caterpillar 3126 Used in CAT Machinery The inline cylinder style has a 7.2 liter displacement, outputting 300 horsepower. The Caterpillar 3126 are used in many medium to large CAT machinery. Dump trucks, bulldozers, loaders and excavators are some of the popular machinery that the 3126 are used in.

The only difference in the 3116 and 3126 is the 1mm larger bore in the cylinders. I don't think the HUEI engines swap any parts except the crank and rods. Always ask you local CAT dealer for any surplus engines. You might get lucky and find a crate engine for a good deal.

Place the appropriate feeler gauge between rocker arm and the valve bridge. Then, turn the adjustment screw in a clockwise direction. Slide the feeler gauge between the rocker arm and the valve bridge. Continue turning the adjustment screw until a slight drag is felt on the feeler gauge.

It usually has a cover over it and a lock wire in it to show if it has been tampered with. Remove the cover and turn the screw out about one and one half turns. If the governor is set to allow more horsepower you will get more power. If not, the governor can limit the amount of power you will get.