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Old 01-16-2007, 07:52 AM   #1
scratchynum1
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Smile 79 bronco IDI 7.3

hello all first post! I have a 79 bronco that i swapped a 7.3 ford IDI motor into and got everything on and put together but i have some problems. first i need to figure out what to do for a tach! anyone know a wiring diagram or somthing i can use to hook up a traditional coil style tach? and also since i swaped the motor and tranny out of a 91 ford truck i need to figure out a speedo. any one have any cheap sugjestions? and finially can anyone giv e me a link to turning up the fuel pump? thanks
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Old 01-16-2007, 12:39 PM   #2
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Can't help you on your problems but I am sure someone here can. Your project sounds very cool! A friend of mine has a '94 f250 stroke he rolled. We were thinking of finding a nice Bronco like a '96 Eddie Bauer & making it a stroke, ttb50, 10.25 & all. You have any pics?
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Old 01-16-2007, 01:41 PM   #3
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Here's the fuel article:
http://www.thedieselgarage.com/forum...ead.php?t=5896
The coil style tachs dont work, unless you're really electronically gifted. There's a few diesel tachs out on the market that are decent. I think with a 91, you can still use an older style mechanical speedo, maybe even use the 79's. Just comb thru a bone yard and you'll find something. Make sure you bring along the wrong one to compare others to.
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Old 01-16-2007, 02:25 PM   #4
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The standard way to get a Tach signal on a diesel is from the alternator. Most Delco alternators have a "TACH" terminal, and some Motorcraft ones do as well.

The speedo could be more problematic. Your bronco used a mechanical speedo, and there is no provision for that on the '91 drivetrain you have, they were off the ring gear tone wheel. You may need to contact a local 4x4 shop to get a speedo drive for your transfer case.
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Old 01-16-2007, 03:23 PM   #5
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hey thanks guys the speedo is really a problem as i knew it was a rear end ring gear hall effect speedo pic up. i was just hoping that somene had a quick fix though. ill post up some pictures as soon as i figure out how. thanks for the quick response guys! and thanks for the link nevrenufhp


also on my front pump cover i have a plug a pickup on the driver side. can i use this for a tach and could somone give me a link or somthign to i can find a cheap tach?



first run in the mud after i got her together crawled into this hole and tried to sink it spinning just the back tires but when i got on it she came screaming out like a bat out of hell
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Old 01-18-2007, 02:17 AM   #6
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well guys tonight i think i may have a problem today while driving into town the oil light on the bronco came on and went off and it does so every once and awhile. was wondering what is the place place on the motor to measure oil press im really not looking forward to taring into the project so soon.:shrug: thanks
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Old 01-18-2007, 02:31 AM   #7
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The oil sender is an idiot light switch, they fail - OFTEN.

Verify pressure with a mechanical gauge, it is common for the 6.9L/7.3L IDI engines to idle at less than 10 PSI hot, and as long as it is 6 PSI or more, and it comes up with RPM, I would not be too concerned.

I would use the next heavier weight oil, if oil pressure is tending to the low side. I don't know where you are from, but since it's January, and I don't see any snow or ice, I would say that you should be running 15W-40 year-round anyway.
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Old 01-18-2007, 02:41 AM   #8
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thanks ill be slapping a mechanical i have at the house on tommarow and see what the result is. thanks for the info. ya im up in norther cali not much snow and the coldest it gets here is usually in the 20's and that has been this last week.

also john g do you have any ideas on the front cover pick up and making a gas style tach work off of it?
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Old 01-18-2007, 02:47 AM   #9
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There are THREE bolts that secure the IP gear to the IP shaft, you *could* use a magnetic P/U (like an ABS or VSS sensor) to read each bolt-head and a tach set for 6 cyliners I suppose.

Don't know if the signal is strong enough, but it's worth a try.
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Old 01-18-2007, 02:55 AM   #10
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hmmmm sounds like it would spare me time and painfull words coming from my mouth and just buy a diesel tach lol thanks for the thoughts. ill probly post some more pictures tommarow of the truck and the engine

thanks
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