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Cummins QSB6.7 (6.7L) CM850 Engine Overhaul Kit Includes: 6 x Pistons (Available in: STD, .50mm) 6 x Piston Pins 12 x Pin Retaining Clips 6 x Piston Ring Sets (Available in: STD, .50mm) 6 x Rod Bearings* (Available in: STD, .25mm, .50mm, .75mm) 1 x Main Bearing Set (Available in: STD, .25mm, .50mm, .75mm) 1 x Upper Gasket Set 1 x Lower Gasket Set 1 x Front Crankshaft Seals 1 x Rear Crankshaft Seals * Connecting rods were offered as both Machine-Split and Fracture-Split. Your complete ESN will be needed when ordering in order to make sure your kit components are correct. Details: Rear Gear Train High-Pressure Common Rail Fuel System Tier 3 Emmissions Non-EGR Piston No.: 4955160 24-Valve Head For Cummins CPLs: 426 427 656 1584 1610 1629 2605 8466 8510 8610 8611 8615 8733 40426 40427 40656 41452 41584 41586 41610 41629 42605 42827 43068 43293 43460 43858 43859 43861 43862 Dynapac: SD2500CS ” Asphalt Paver CA260PD ” Vibratory Compactor CA702PD ” Vibratory Compactor CA612PD ” Vibratory Compactor CA602PD ” Vibratory Compactor CA512PD ” Vibratory Compactor CA362PD ” Vibratory Compactor CT3000 ” Vibratory Compactor CA260D ” Vibratory Compactor Hyundai: HL757-9S HL749-9 JCB: 427 437 437ZX Ingersoll Rand: PF6110 PF6160 PF6170 Komatsu: WA250-6 ” Wheel Loader WA250PZ-6 ” Wheel Loader WA320-6 ” Wheel Loader WA320-6N ” Wheel Loader WA320PZ-6 ” Wheel Loader Tadano: GR300XL ” Rough Terrain Crane 10010MX ” Crawler Crane GR350XL-2 ” Rough Terrain Crane GR350XL-1 ” Rough Terrain Crane Ammann: ASC200HD ” Vibratory Compactor ASC200D ” Vibratory Compactor ASC250D ” Vibratory Compactor ASC250HD ” Vibratory Compactor Vogele Vision: 5100-2 5103-2 5200-2 5203-2 Svedala Demag: DF145CS DF145C
Warranty Information
Overview
We stand behind every part we sell — new, rebuilt, or used. While RF Engine is not the manufacturer and cannot extend additional warranties, we do guarantee that each product will arrive as described, in usable condition, and free from material defects or misrepresentation.
Warranty Coverage
- New Parts: Covered under the original manufacturer’s warranty. All terms and coverage are set by the manufacturer. Copies available upon request.
- Rebuilt, Reconditioned, and Used Parts: Backed by an inspection-only warranty unless otherwise stated. As with new parts, RF Engine cannot provide further warranty coverage beyond the manufacturer’s terms.
- No Additional Warranty: RF Engine does not offer any express or implied warranties. However, if an issue arises, we are here to assist and will support you through any applicable manufacturer claim process.
Our Guarantee
All parts are guaranteed to be in the condition stated at the time of sale and free from misrepresentation. If something isn’t right, we’ll work with you to resolve it — including returns, exchanges, or refunds when appropriate.
- We sell parts — we don’t make them — but we stand behind what we sell.
- Guaranteed to match the description or your money back.
- Manufacturer’s warranty applies where available; we’ll help if you ever need it.
Used Parts — What to Expect
Used parts are cleaned, inspected, and guaranteed to be usable, but please note:
- They often have signs of wear, surface rust, blemishes, or cosmetic imperfections.
- They may include old gaskets or residue and likely require further cleaning or machining before installation.
- They are not refurbished, remanufactured, or restored to like-new appearance.
We recommend careful inspection and strongly encourage installation by a qualified heavy-duty diesel mechanic.
- Worn, not worn out — used parts may show signs of age but are fit for service.
- All used parts are tested for usability, not appearance.
Questions?
If you have questions about a part’s condition, warranty, or how we handle returns and guarantees, feel free to contact us. We’re here to help.
Last Updated: June 22, 2025
All specifications and numbers are provided for reference only and should be independently verified before use. While we guarantee our parts match their descriptions and accept returns for any discrepancies, we cannot be held liable for installation costs, modifications, or consequential damages. Questions about compatibility? Contact our parts experts at 800-828-6943, sales@dieselcranks.com, or via live chat, Mon-Fri 8am-5pm EST.
