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Phil H

07-01-2015 15:47:37

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Thanks for the feedback, I wasn"t sure this was the form to get answers, so I posted on tractor pulling and there were a lot of people there. That"s why I am late replying to your feedback. I now have the correct timing tool(1.484). From setting cams on motor cycles I understand how this makes a motor pull hard by retarding the cam and by advancing the cam gives the motor a lot of top end. But I have never worked on a diesel. I just want my 72 IH 10 wheeler to run good and pull like it did before I had to change a stuck injector. I goofed up and turned the screws on the rack, and un knowingly changed the injectors ability to inject the same quantity of fuel into the cylinders. Now I know!!!! I will set things per the book and hope all turns out ok. Again, thanks for your time and comments....Phil

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Jon Hagen

07-02-2015 11:32:14

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 Re: 671 DETROIT INJECTOR TIMING in reply to Phil H, 07-01-2015 15:47:37  
Injector adjustment is critical for easy cold starting and power.
The rack lever adjustment is a learned art, more difficult with the old 2 screw levers, much easier with the newer 1 screw levers. Your reward for a careful rack lever adjustment is an old 2 cycle DD engine that idles smooth as an electric motor.

I still have one old DD 8V92 TI set at 440 hp that I crank up once in a while just to hear that sound.
Great old motors.

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Phil H

07-03-2015 06:56:47

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 Re: 671 DETROIT INJECTOR TIMING in reply to Jon Hagen, 07-02-2015 11:32:14  
Wow, 8v92, 440hp. That is a lot more than my 238hp. I have the 2 screw rack adjustment, on my engine, with 4 exhaust valves. I have watched a few videos on some ways to adjust the 2 screw rack, and can see that it is a matter of feel. Like setting 3-2barrel carbs. If I can get everything right I will be happy. Have a lot of work for this old girl. Seems like everything I have now is old, guess that follows right alone with me. My wife says we"re just getting to be old doggies now. Thanks for the comments Jon.....

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Jon Hagen

07-05-2015 17:29:07

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 Re: 671 DETROIT INJECTOR TIMING in reply to Phil H, 07-03-2015 06:56:47  
I repowered a little Versatile 125 4X4 with a 6-71 / 238 many years ago. Made a good tractor out of it. About 40% more HP than stock. Had to dual it to get enough traction.

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Phil H

07-07-2015 17:54:30

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 Re: 671 DETROIT INJECTOR TIMING in reply to Jon Hagen, 07-05-2015 17:29:07  
Hi, thanks for the reply, I"ll bet you had enough power!!!! That"s what I have, a 238hp. I just set the rack and now I"m going to haul some gravel out of the creek. The engine ran real sick last time I hauled 10 yards. So... kind of apprehensive.... but I did every thing the way the book said, and all those who have been good enough to help out with comments......so here goes. I will post my results for those who made comments and tried to help out, many thanks!!!!! Phil H

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