First post- few questions - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 
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post #1 of 4 (permalink) Old 07-23-2019, 01:29 AM Thread Starter
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First post- few questions

I'm looking at a 92 f350 crew cab SRW 4x4 with 145k mi. NA, E4OD auto. 2 owner. No blowby, sounds good. Seller is going to let me bring it home to check it out, and I have a few questions. I should add that I'm not new to diesels- I've been driving 1stGen Cummins Dodges for 20 years- but I am not as well versed in the idi world. 3rd kid warrants the need for a bigger cab. I do have above-average mechanical skills- I've rebuilt transmissions, differentials, and injector pumps.

What are common issues with these trucks? I know it needs Injector return lines and orings (that looks like a 5yr replace-it-whether-it-needs-it-or-not deal). Yet it seems quite peppy for being a non-turbo.

Is lift pump output pressure as critical as it is with the rotary pumped 12v? What should it be?

Where can I get common parts and upgrades, preferably from a vendor who kinda specializes in idi performance?

Issues with the E4OD? This one seems to shift kinda hard. How hard is it to do a zf swap?

Is it worth it to do a kingpin Dana 60 axle swap?

Thanks for taking time to read this.
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post #2 of 4 (permalink) Old 07-23-2019, 09:57 AM
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The system is designed for blowby to go through the CDR valve and from there into the intake air stream so you really can't tell how much blowby you have unless you block off the CDR valve. After doing that, the only way for an accurate check is with a manometer and the spec is no more than 6" at governed no load RPM. The CDR is similar to a PCV in a gas engine only unmetered and way more blowby flow.
Lift pump pressure is fairly low, something like 3-5 PSI. Not critical to IP life like I understand it is on the Cummins.
No set time on the drainback hoses and O-rings, if you don't see a visible fuel leak, they let you know by extra long cranking time in the morning after sitting overnight. Local injection shops still carry fuel system components.
As far as the E4OD, I've personally known people who treated there's like gold, towed very lightly if at all, and yet their's failed. Others have had no problems. Nowadays I understand there's updated parts so when overhauled they're better than new.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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post #3 of 4 (permalink) Old 07-23-2019, 10:46 AM Thread Starter
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Thanks for the info. For checking blowby, I just took off the oil fill cap while it was idling and didn't see any vapor coming out
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post #4 of 4 (permalink) Old 07-23-2019, 02:16 PM
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Right, that's what I was saying, most all the blowby bleeds off into the intake manifold through the CDR valve so you may or may not see much out the oil filler.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
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