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  #1  
Old 05-10-2010, 01:13 AM
gofalls gofalls is offline
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Why rebuild your 7.3 and for how much?

I am about to buy a 1993 e350 van with a 7.3 and 400k miles on it. Runs fine now but I imagine it will need to be rebuilt within my ownership of it. How much did you pay for a rebuild and what was the final failure on the motor that made you decide to rebuild?
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Old 05-10-2010, 01:42 AM
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oreocreaming oreocreaming is offline
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no failure yet. got a second engine that i want to get rebuilt and BUILT. quote was 1500-2000 for a basic rebuild.
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1990 F-350 LARIAT 4x4 7.3L IDI diesel ZF5. 1992 front with cowl induction hood, 1997 doors and tailgate. 2004 6.0l intercooler, PSD heated power and signal mirrors. AMSOIL bypass system, full synthetic system. 5.38's, 46" tires, 20" wheels, 12" lift with shackle reversal front, shackle flip rear. Ladder bars in the rear, 2" hydraulic assist steering, hydroboost brakes, onboard dual compressor air system. twin air horns, black interior, 100 gallon in-bed tank. 94 IDI-T motor, SMF conversion.
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Old 05-10-2010, 07:28 AM
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I thought the 7.3L was a bored over 6.9L and the cylinder walls were thinner, thus rendering rebuilds undesirable. I could be completely wrong though.
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2000 F350 XLT PSD CC 6-sp SRW 4x4 - 6637
1986 F250 XLT Lariat supercab 4x4 6.9L IDI T-19, 4.10's
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Old 05-10-2010, 12:22 PM
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the 7.3 walls are thinner, but you dont always have to bore over the cylinders when you do a rebuild. only if they are scared up. you can hone the cylinder walls. you can also sleeve the cylinder walls if you want. all depends on the condition of the block,.
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1990 F-350 LARIAT 4x4 7.3L IDI diesel ZF5. 1992 front with cowl induction hood, 1997 doors and tailgate. 2004 6.0l intercooler, PSD heated power and signal mirrors. AMSOIL bypass system, full synthetic system. 5.38's, 46" tires, 20" wheels, 12" lift with shackle reversal front, shackle flip rear. Ladder bars in the rear, 2" hydraulic assist steering, hydroboost brakes, onboard dual compressor air system. twin air horns, black interior, 100 gallon in-bed tank. 94 IDI-T motor, SMF conversion.
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Old 05-10-2010, 01:28 PM
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BlueOvalBud BlueOvalBud is offline
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Welcome to the IDI diesel forum!
The 6.9 IDI and 7.3 IDI are very similar and most external parts can be swapped between the two.
Find an '86 or '87 6.9 engine. Have the 6.9 rebuilt and install that into your truck.
Why? The 7.3 is a bored out 6.9, so the 7.3 cylinder walls are thinner. The 7.3's are prone to cavitation (when the cylinder walls develop pin holes and leak coolant into the cylinder). Don't bother with a rebuilt 7.3 because the cylinders are sleeved. Dave S. went through 3 rebuilt 7.3's where the sleeves were incorrectly installed. Finally, he built a 6.9 and is doing well. Oh, by the way, his 6.9 is far from stock and holds up excellent.
I don't have a ballpark number for a rebuild. However, members spend about 5,000 if the machine shop does the machining and you do the assembly.
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1996 F350. 7.3 PSD, E4OD, 4x4, D60, just starting....
1985 F-350 Work truck. 6.9 Diesel IDI, T-19, 2wd 3.55 Ford 10.25....Planning a fully built 6.9 with PSD turbo, ZF5, Dana 60, 5.13's with ARB's - Scrapped
1991 F-Superduty Work truck. 7.3 Diesel IDI, ZF5, 2wd, 5.13's, 12' x 8' x 4' stake dump. Planning a nasty 6.9 and Dana 60 swap
IDI's make me
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Old 05-10-2010, 07:02 PM
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Mileage doesn't really mean anything...... If it was properlly maintained, it can go another 300k miles as long as you keep it up.
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 05-10-2010, 09:02 PM
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You bring up a good point about the mileage! Maintenance is key!
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1996 F350. 7.3 PSD, E4OD, 4x4, D60, just starting....
1985 F-350 Work truck. 6.9 Diesel IDI, T-19, 2wd 3.55 Ford 10.25....Planning a fully built 6.9 with PSD turbo, ZF5, Dana 60, 5.13's with ARB's - Scrapped
1991 F-Superduty Work truck. 7.3 Diesel IDI, ZF5, 2wd, 5.13's, 12' x 8' x 4' stake dump. Planning a nasty 6.9 and Dana 60 swap
IDI's make me
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Old 05-10-2010, 09:52 PM
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id do a compression test,and see if it burns oil.if both are tolerable,id grab a new ip,set of injectors,have it professionally timed,and run her.
if it fails inside 100k mile,your not out anything.put the ip/injectors on the new(er)/rebuild and keep going.
cavitation check already mentioned.
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Old 05-10-2010, 09:52 PM
 
 
 
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