Our DP N55 fuel injectors for Detroit Diesel engines come with full warranty are are shipped direct to you the same day. This injector is one of the most frequently used injectors for some 53 and all 71 natural series engines. Please refer to OEM service manual for instructions on how to install and properly calibrate this injector. This rebuilt fuel injector is also referred to as R- 5228785. On our site you will find related parts such as fuel lines or connector that must be replace at of replacement of fuel injectors. Diesel Pro offers the most intuitive tool to find what you need. We are the largest online end-user direct distributor of the parts for Detroit Diesel engines. Since our inception we have provided parts, engines and assistance to thousands of customers worldwide. Please contact us with your questions.