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CATEGORY LISTINGS > DETROIT > 671N Tuneup and Injector Replacement [ REFRESH ]
Thread Title:

671N Tuneup and Injector Replacement


Created On Tuesday August 08, 2006 00:22 Diesel Talk
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ripfish
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Joined: Aug 2006

Note Tuesday August 08, 2006 00:22 View thread in raw text format
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I just picked up 6 rebuilt injectors for my in line 671N. I have had three stuck injectors over the past month or so. Can I do this myself? Replacing the injectors, resetting the rack. Anybody with experience want to share the common things to be sure of when doing this?

I plan on getting a injector timing gauge. I guess I am not sure how to use it, but figure it cannot be too difficult. If I could find a good reliable mechanic to come out in the field and do the repair and tune up for me, I would. I am in Orland, CA. North of Sacramento about 1.5 hrs.

I dont know why the injectors have been sticking in full fuel position, but they have. That is what has prompted me to change all six. I am going to start running Stadyne fuel conditioner.

Also, I have started having hard start problems over the past month too. I hear there is a check valve on the fuel return system. I cannot find anything about that in the manual. Anybody know what or where that is located.
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island24
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Joined: Sep 2006

Note Wednesday September 13, 2006 18:41 View thread in raw text format
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i and a diesel mechanic by trade and have done alot of work on detroit diesel 2 cycle engines. yes u can do the replacement and tune-up urself. the prosess is not that hard and and should only take afew hours to complete, if interested i can give u instructions on how to do it.
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island24
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Joined: Sep 2006

Note Wednesday September 13, 2006 18:52 View thread in raw text format
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in the case of the sticking injectors and the fuel "checkvalve" there is no check valve its a restrictor fitting that that is in the fuel return side if the head to boost fuel pressure. the fitting has an .80 thousands hole in it, look at the fitting and see if it the right one, should b stamped on fitting, or if its clogged. your injector sticking can b caused by afew things, misadjusted rack, rack binding, etc.... make sure u have good quality fuel and that ur injectors arnt gumming up cuz of bad fuel. if u have n e nemore ? jus ask.
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