Posted by johns on August 26, 2012 at 05:08:02 from (69.163.7.60):
In Reply to: 3-71 detroit posted by 1948 mm on August 25, 2012 at 08:02:48:
Is he willing to take the engine apart or does he just want to do some tuning? Before you do anything buy a 71 series Detroit service manual if he doesn"t have one. A guy can do alot of damage and risk the motor running away if the rack and gov. are adjusted wrong. I"m assuming since you asked how to turn up the fuel you are not familiar with how a Detroit runs. There is no injection pump. Each unit injector runs off the cam and is timed to deliver fuel. Most 3-71s ran 2100 rpms all day long in other applications. After you get a manual go to the Oliver Heritage website and order back issue #30 from April/May 2009. Editor Sherry, along with help from Detroit expert Scott Franklin did an excellent article on how to get more power out of a 3-71. N series injectors, liners, 18.7:1 pistons, and 4 valve head will all help make power. I can"t stress enough to follow the service manual excactly and in order when adjusting the valves, fuel rack, and gov.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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