OEM Quality or BETTER
Every part meets or exceeds original equipment specifications for guaranteed performance and reliability.
100+ Years of Engine Expertise
Trust in our century of combined experience serving the heavy-duty diesel industry.
Same-Day or Next-Day Shipping
Orders placed before 3PM EST ship same day. We know downtime costs money.
New, Reman, & Used
Complete selection of parts to fit every budget and application need.
Details
Caterpillar Cat 3126 6PZ 8SZ 9SZ CKM 7AS 3 valve Truck.50mm bore OF4621B/21 OF4621B/21 Truck Applications Out of Frame Kits 2 piece pistons: Piston Skirt?s, Piston Crown?s Piston Pins, Piston Clips, Main Bearings, Rod Bearings, Thrust Washer, Upper Gasket Set, Lower Gasket Set & Crankshaft seals (Repair Sleeve?s are available for purchase)
Warranty Information
New parts are covered under the original manufacturer's warranty. Rebuilt and used parts come with an inspection-only warranty unless otherwise stated. While RF Engine is not the manufacturer and cannot extend additional warranties, we're here to help if any issues arise — including support with manufacturer warranty claims.
We guarantee all parts to be as described and in usable condition, free from misrepresentation or material defects. If something isn't right, we'll work with you to make it right.
Used parts are cleaned and inspected, but may show normal wear, surface rust, or cosmetic imperfections. Most will require further cleaning or machining prior to installation. We strongly recommend installation by a qualified heavy-duty diesel mechanic.
View full warranty policy
We guarantee all parts to be as described and in usable condition, free from misrepresentation or material defects. If something isn't right, we'll work with you to make it right.
Used parts are cleaned and inspected, but may show normal wear, surface rust, or cosmetic imperfections. Most will require further cleaning or machining prior to installation. We strongly recommend installation by a qualified heavy-duty diesel mechanic.
View full warranty policy
