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| Hyper-formance Engine Kits are designed to improve cold weather
starting, extend engine life & increase horsepower. The Pistons in
these overhaul kits are produced from an aluminum hypereutectic alloy
which retain a high percentage of strength and hardness during normal
operations. They have a resistance to thermal expansion and have a
higher tolerance to thermal breakdown under extreme operating
conditions. The piston rings included are moly-coated rings for superior
sealing power and help extend the life of the engine. The combustion
bowls in these pistons are engineered to create higher compression. Hyper-formance pistons raise the static compression of an engine approximately 1.25 points. This increased compression creates higher cylinder pressure and temperature for a more complete, efficient combustion process. Hyper-formance pistons ignite a larger ratio of fuel/air per stroke, which wastes less raw fuel. This is the key to increased horsepower. What Kit Fits Engines with serial numbers 215,000 to 335,845 Engines with the following block numbers: R40610 R40620 R43310 R45980 R47020 R47110 R47170 R48440 Parts Included In Engine Underhaul Kit (6) Connecting Rod Bearing Pair (1) Main Bearing Set (1) Oil Pan Gasket Set (1) Thrust Bearing Set (12)Connecting Rod Bolts Parts Included In Engine In-Frame Kit (6) Sleeve Assembly (Sleeve, Piston, Wrist Pin, Piston Rings) The cylinder kits in this kit come pre-loaded. (1) Main Bearing Set (1) Thrust Washer Set (6) Connecting Rod Bearing Pair (1) Head Set (12) Connecting Rod Bolts (1) Pan Gasket Parts Included In Engine Overhaul Kit (6) Sleeve Assembly (Sleeve, Piston, Wrist Pin, Piston Rings) The cylinder kits in this kit come pre-loaded. (6) Connecting Rod Bearing Pair (1) Main Bearing Set (1) Gasket Set (1) Thrust Washer Set (4) Camshaft Bearings (1) Camshaft Plug (6) Piston Pin Bushings (12) Connecting Rod Bolts (1) Front Crankshaft Seal (1) Rear Crankshaft Seal |
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.
