Weak 1990 7.3 dually
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Weak 1990 7.3 dually
I've been fixing up our old farm truck, 1990 F-350 custom dually with a 7.3 and a 5 speed. Its got a dew-eze hay bed on it too. I'm almost done but there is 1 thing left to do. Ever since my grandparents bought it new in 1990 it has been notorious for having no power. It had a total motor rebuild by the local diesel shop in 2008, but it didn't change a thing. When compared to my 83 6.9 that has close to 300,000 on the clock, it is terrible. While there is about a 2000 lb difference between the two I would think the lower gearing in the tranny and rear end (4.10 Vs 3.55) would even that out. If I'm thinking wrong correct me but if not some simple tips on what I can do would be of great help.
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Joined: May 2013
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From: Redding, CA
I've been fixing up our old farm truck, 1990 F-350 custom dually with a 7.3 and a 5 speed. Its got a dew-eze hay bed on it too. I'm almost done but there is 1 thing left to do. Ever since my grandparents bought it new in 1990 it has been notorious for having no power. It had a total motor rebuild by the local diesel shop in 2008, but it didn't change a thing. When compared to my 83 6.9 that has close to 300,000 on the clock, it is terrible. While there is about a 2000 lb difference between the two I would think the lower gearing in the tranny and rear end (4.10 Vs 3.55) would even that out. If I'm thinking wrong correct me but if not some simple tips on what I can do would be of great help.
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From: Mi'kma'ki
yeah,something's backwards.n/a to n/a,stock to stock,the larger 7.3l engine,should be the one with slightly more nuts of course.
in '08 when they (needlessly) rebuilt the engine,did they re-use the old medium ware items or swap them out for reman too? - ip and injectors.
how much do those beds weigh?
in '08 when they (needlessly) rebuilt the engine,did they re-use the old medium ware items or swap them out for reman too? - ip and injectors.
how much do those beds weigh?
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The pump looks unchanged and considering that there are 2 stayndyne injectors 2 no names and the rest are I think bosch they didnt replace them either. the beds weight about 2000 to 2500 lbs give or take. Ive considered retarding the pump by turning the whole thing counter clockwise. This is what the diesel guy at oreillys suggested. Any thoughts or comments on this?
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From: Mi'kma'ki
she really could just use a total tune for starters.anything less would likely not be worth the time.since she's been reman now,it really would be sad to not see the medium ware items changed out and have the timing properly set.she'll be around for a great many of years now.
https://www.ford-trucks.com/forums/1...p-ratings.html
https://www.ford-trucks.com/forums/1...p-ratings.html
Hotshot
Joined: Feb 2004
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From: Marengo, Iowa
I doubt retarding the timing really will be the trick, the timing needs to be set to the proper time, and maybe fuel turned up. If you retard the timing, depending on how it is now, you will be chasing the piston down, not driving it down. Advancing would seem more reasonable to me, but there are too many factors at play to know just from a simple lack of power complaint. Heck, it could just simply need the fuel filter changed!
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I'm really beginning to think there is more wrong here than I originally hoped for, and you guys are probably spot on. When I replaced the seal on my 6.9s injector pump housing adapter we got the pump on with it slightly retarded it had good power but at a idle the whole truck had a shake to it and smoked a lot. With just a slight twist clockwise it stopped the shaking and the smoke. This is why I thought retarding it might help some because at an idle its smooth and I could not get it to even puff a bit of smoke. So I went ahead and turned the pump counter clockwise and it didn't change anything it turned about a 1/4 inch and its like I didn't even touch it I mean no change whats so ever. I'm no expert but i don't think its supposed to work like that.
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Hotshot
Joined: Feb 2004
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From: Marengo, Iowa
Unless it was over advanced, retarding it would only make the problem worse. It works essentially the same as retarding a distributor on a gas motor. The only difference is the fuel availability. The later you inject the fuel, the less compression heat you have to ignite the fuel.
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You guys are right. I will have to do a little research and find someone around here to tune it after I replace all the injectors and such. The only place that I know of are the people who rebuilt it and I'm not a big fan because they say they do all diesels, but 99% of their work is on performance Cummings. They either don't care or don't want to work on the ford diesels.
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