Most John Deere engines are replaceable with used engines with matching specifications. The company offers a complete line of remanufactured engines. Many other sources have used John Deere engines available, including AbileneMachine.com, TractorPartsAsap.com and RockAndDirt.com.
John Deere recommends replacing significantly damaged engines to control repair costs and reduce equipment downtime. Used engines purchased from John Deere come with a one-year warranty that covers all parts and labor, provided the customer has it installed by a certified dealer. Independent sellers may not warranty their used engines. Most sellers assess a core charge payable with the engine purchase, but the core charge is refundable when the customer returns the old engine block.