5.9L Cummins Model C Short Block Engine 1989-1993  Dodge/Ram Cummins Diesel

Engine Manufacturer: CHOATE Engineering Performance CHOATE Part Number: CEP59CSMC8993 Cummins Failures are no secret. Although they have been a very reliable platform for many years, they have evolved. And with it, they have developed some shortcomings that we see on a consistent basis. If you are interested in learning more about valve seat failures on the 5.9L Cummins engine. Be sure to check out the video at the end of the page. Choate Engineering fixes these issues and is known for making a good platform, great. And saving the customer money as well as down time.

The purpose of the Model C platform is to provide a superior product over the OE, for a lower cost!

This 5.9L Cummins Short Block Model C Engine Reman Diesel Engine Includes:

• Choate Billet Freeze Plugs
• New Oil Pump
• Full CNC blue print machining, (bore, deck, hone and line honed).
• The Cylinder bores are blue print bored to a true 90 degrees from the crankshaft center line, prior to being diamond honed to within .0002 inch for precise piston to cylinder bore clearances.
• The main housing is honed to precisely align the crankshaft in the engine block. The Cylinder walls are bored 90 degrees over the crankshaft center line. The piston diameter measured to the nearest .0001 inch matched to cylinder bores.
• New upgraded Pistons
• New pistons rings
• New Pin retainers
• New OE tappets
• Crankshaft is Polished and ground to .0005 concentricity or less
• New Rod bearings
• New Main Bearings
• New Cam Bearing
• 12 Months/12k Warranty

Cylinder Heads- While there aren't as many issues with the bottom end of the Cummins, there are really BIG problems in the head department. Valve seats fallout contacting the piston and cause catastrophic failure. We machine oversize valve seats within creased press fit area to remedy this issue. Stamped gallery plugs in the heads blow out causing a mixture of oil and coolant, destroying the bearings. We thread the head and insert threaded plugs to make sure this issue never rears its ugly head. Plus: Freeze plugs in the block blow out leaving you at best stranded on the side of the road, at worst, with a severely overheated engine in need of Remanufacturing. Every new Choate Cummins engine comes standard with billet freeze plugs that are blow out proof using a tie bar bolting them into the side of the block.