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7.3 navastar


 
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RalphWD45
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Joined: 05 Jan 2008
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Location: Roy, Wa.

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PostPosted: Sat Jan 26, 2013 7:07 pm    Post subject: 7.3 navastar Reply to specific post Reply with quote

I got took 2 yr's ago on the purchase of a 90 ford 350 superduty flatbed, with a 7.3 navastar, and zf 5spd tranny. My diesel runs good, but pours smoke out behind it, and has poor compression, 200 and change. I found an 86 7.3 bolted to a allison, that is reputed to run well, and no smoke, $900.00 for the pair, or 600 for the motor. Will my fresh rebuilt ZF 5 spd manual bolt on without problems, or will I find that the crank on an automatic is not drilled to take a pilot bearing, simular as to what dodge did with the 318? I don't know diddily about Fords, or diesels!
 
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justanothercase
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Joined: 04 Mar 2007
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PostPosted: Sat Jan 26, 2013 8:11 pm    Post subject: Re: 7.3 navastar Reply to specific post Reply with quote

From my limited knowledge you should have everything you need. 7.3 is a fleet motor used in many different applications and im not aware of different cranks for auto trans.is this out of a bus? I ask because of the allison behind it. good luck to you.
 
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onefarmer
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Joined: 14 Jan 2005
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Location: St. Johns Mi

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PostPosted: Sun Jan 27, 2013 6:23 am    Post subject: Re: 7.3 navastar Reply to specific post Reply with quote

A '90 7.3 and a '86 are two different animals. The 86 is indirect injection, has a injector pump and not much if any electronic controls. The 90 is a powerstroke direct injection, no pump, turbo, and the injectors are fired by electric over hydraulics.
 
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GarrettFields
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Joined: 15 Dec 2012
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Location: London KY

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PostPosted: Sun Jan 27, 2013 8:02 am    Post subject: Re: 7.3 navastar Reply to specific post Reply with quote

Onefarmer is on crack. The Powerstroke didnt come out in pickups until 1994.5 You should be fine I used a 7.3 out of a Frito-Lay truck with a allison and put it in my 5 speed 92 F350 that had cavitation issues.
 
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nickg
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Joined: 04 Apr 2000
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Location: southern indiana

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PostPosted: Sun Jan 27, 2013 8:24 am    Post subject: Re: 7.3 navastar Reply to specific post Reply with quote

An 86 model should be a 6.9 not a 7.3. At least thats what my 86 f-250 diesel is. As for smoking all those 6.9 and naturally asperated 7.3s smoke. Not much difference in a 6.9 and a 7.3. At any rate Im fairly certain it should be drilled for a pilot bushing but Id ask the guy if he would be willing to let you or himself pull them apart to see before you comit to buying it.
 
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onefarmer
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Location: St. Johns Mi

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PostPosted: Sun Jan 27, 2013 10:25 am    Post subject: Re: 7.3 navastar Reply to specific post Reply with quote

OOOOOPPs I was thinking wrong sorry. You're right the powerstoke didn't come out until 94.5. Must have been a senior moment.
 
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GarrettFields
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PostPosted: Sun Jan 27, 2013 11:54 am    Post subject: Re: 7.3 navastar Reply to specific post Reply with quote

It happens! My response didnt come off as light hearted on the computer as it did in my head. Don't want to sound like a pr!ck of misery, you may have the answer to a million $ question I have someday!
 
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RalphWD45
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Location: Roy, Wa.

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PostPosted: Sun Jan 27, 2013 1:06 pm    Post subject: Re: 7.3 navastar Reply to specific post Reply with quote

I want to thank you four guys, that answered me! I have done a lot of motor swapping with gas rigs, but know nothing about the diesel rigs,and my experence has been confined to 1980 and older.I still run a 75 dodge 3/4 ton and 80 ford 1/2 ton, and have had them since they were low miles, used rigs. I need the 90 ford 350, to tow my tractor, hay, hauling trailer, as it is heavier and a duelly, and won't get pushed around by the trailer! THANKS GUYS!
 
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