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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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Old 03-24-2005, 10:49 PM   #1 (permalink)
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7.3L Block Woes

Ok,

Got to the point to remove the heads tonight. Got the left head off without much hassle than what was to be expected. Found a couple of head bolts not very tight. Got to the right head and all went for the worse. Broke 2 head bolts off between the last 2 cylinders. [img]/ubbthreads/images/graemlins/eek.gif[/img]
The remainder of the bolts came off very difficult except 2 bolts found loose for the torque specs.[img]/ubbthreads/images/graemlins/crazy.gif[/img]
After getting the head off the block was what I didn't want to see. The last 2 cylinders on the right bank had evidence of rust on the cylinder walls. Yep 1 year ago the problem was overlooked. Seized cylinders from water in the cylinders from the intake. Thinking this was the demise of the 2 head bolts failing. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
Now I have a block that needs rebuilding with 2 broken head bolts needing removed.
All this just to replace leaky HG's.

Good thing is I found out yesterday, from my buddy, that the $800.00 80,000 mile 7.3L is a good motor from an E series van.

Twas depressing enough to post her as a rolling chassis for sale. [img]/ubbthreads/images/graemlins/phoney.gif[/img]

Ron
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Goldie 1990 F-350 Custom 4x4 C/C DRW conversion. 7.3L Banks non-waste gated turbo, ZF-5 with 4" custom Exhaust complimenting a RDT venturi system, Autometer Pyro and boost 2 gauge pillarpod and your standard compliment of mechanical gauges. Clutch pedal Heim joint mod.

The Beef 1989 F-350 Lariat C/C DRW 7.3L N/A, ZF-5. Clutch pedal heim joint mod. Original price $500.00.
Currently slated for an extreme makeover ground up restoration.

Mater 2007 F-250 Lariat 4x4 6.9L IDI, T-19 trans pushing a 7'6" Western plow. Completely assembled from the tires up!


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Old 03-24-2005, 11:55 PM   #2 (permalink)
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Re: 7.3L Block Woes

Sorry to hear the bad news. But i am going to remove various parts for painting pretty soon, thanks for the heads up on head bolts. I'll be sure to check the torques on those puppies.
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Old 03-25-2005, 12:32 AM   #3 (permalink)
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Re: 7.3L Block Woes

damn...that's bad news Dog.

But why not put the $800 almost-new motor in her?


I can't remember any discussion here about re-torqueing headbolts.

Has that been covered in depth already?

It seems like it's something one might want to do every 5-10 yrs...or at least check 'em...and torque any -loose- ones for sure.
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Hydra 35-ton Excavator, 6V71T; Isuzu C201 genset;
'71 VanPelt Pumper, Cummins 855 Turbo

There used to be a link here, to some useful IDI-diesel tech info; but it was chopped out by others, in a vain attempt to repress the very essence of the internet: linking!
sigh...
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Old 03-25-2005, 12:48 AM   #4 (permalink)
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Re: 7.3L Block Woes

i feel for you, Ron.
c'mon, though. with that $800 plant, you STILL have a fraction of what most of us have in ours - why sell? tow the Beef to the weekend & you'll have a team of experts at your disposal...

BTW: that beer is still on ice for when you get down to Little Creek [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 03-25-2005, 07:10 AM   #5 (permalink)
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Re: 7.3L Block Woes

d9d,

Can't remember seeing anythig before about retorquing. I am gonna get a closer look at the block today when I get it on the stand but it looks like the motor is a rebuild. [img]/ubbthreads/images/graemlins/shrug.gif[/img] So much for 263,000 on that one.

Yea Frank I know what you mean. After last night, could have used that cold one. [img]/ubbthreads/images/graemlins/biggrin.gif[/img] (looking like June 9th-ish).
Now I just gotta do some sucking up to the wifey. After telling her what happened she wants the Beef replaced with something newer. (From the darkside! [img]/ubbthreads/images/graemlins/eek.gif[/img])
Had to explain cost breakdown per year. Even with the $800.00 plant would still be right around $3,500.. for total cost of purchase and repairs in one year. STILL less that her ride.

I am gonna get some photos posted in my gallery and over yonder for all to see. [img]/ubbthreads/images/graemlins/phoney.gif[/img]

Ron
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Goldie 1990 F-350 Custom 4x4 C/C DRW conversion. 7.3L Banks non-waste gated turbo, ZF-5 with 4" custom Exhaust complimenting a RDT venturi system, Autometer Pyro and boost 2 gauge pillarpod and your standard compliment of mechanical gauges. Clutch pedal Heim joint mod.

The Beef 1989 F-350 Lariat C/C DRW 7.3L N/A, ZF-5. Clutch pedal heim joint mod. Original price $500.00.
Currently slated for an extreme makeover ground up restoration.

Mater 2007 F-250 Lariat 4x4 6.9L IDI, T-19 trans pushing a 7'6" Western plow. Completely assembled from the tires up!


I got your "Jeep Thing" now it burns when I pee.
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Old 03-25-2005, 10:08 AM   #6 (permalink)
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Re: 7.3L Block Woes

Retorqueing was discussed several weeks/months back and was agreed to be a "Do Not Do" item. Quite often the bolts will rust or the threads adhere to the head threads which would give a false retorque reading. You certainly would NOT want to untorque then retorque as the bond of the head gaskets would be broken and probably leak. A search may find the post, Mel was in on the discussion too.
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Old 03-27-2005, 11:46 AM   #7 (permalink)
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Re: 7.3L Block Woes

[ QUOTE ]
Retorqueing was discussed several weeks/months back and was agreed to be a "Do Not Do" item. Quite often the bolts will rust or the threads adhere to the head threads which would give a false retorque reading. You certainly would NOT want to untorque then retorque as the bond of the head gaskets would be broken and probably leak. A search may find the post, Mel was in on the discussion too.

[/ QUOTE ]


Thanks Pete! I'd been away when that one went by I guess.

Dog described some as actually being loose tho...so I'd think if one had the valve-covers off for anything else, it wouldn't be a bad idea to see if any are loose; and go ahead and tighten those...
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My Rig: 1991 F350, 4x4, 5-spd, 7.3na, 4.10 solids, std. cab, flaking factory blue... [img]/ubbthreads/images/graemlins/grin.gif[/img]

My other diesel is a...
Hydra 35-ton Excavator, 6V71T; Isuzu C201 genset;
'71 VanPelt Pumper, Cummins 855 Turbo

There used to be a link here, to some useful IDI-diesel tech info; but it was chopped out by others, in a vain attempt to repress the very essence of the internet: linking!
sigh...
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Old 03-27-2005, 12:07 PM   #8 (permalink)
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Re: 7.3L Block Woes

Had 3 Head bolts that were only about 50-60 ft/lbs torqued when I loosened them up.

Anywho, got the motor bout ready to go in after switching oil cooler, motor mounts, injectors, GP's and IP.
Putting in Luk clutch kit an Lucky mod to the flywheel. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
Gonna plug her back home this afternoon and see what she's got. [img]/ubbthreads/images/graemlins/smokin.gif[/img]

Ron
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Goldie 1990 F-350 Custom 4x4 C/C DRW conversion. 7.3L Banks non-waste gated turbo, ZF-5 with 4" custom Exhaust complimenting a RDT venturi system, Autometer Pyro and boost 2 gauge pillarpod and your standard compliment of mechanical gauges. Clutch pedal Heim joint mod.

The Beef 1989 F-350 Lariat C/C DRW 7.3L N/A, ZF-5. Clutch pedal heim joint mod. Original price $500.00.
Currently slated for an extreme makeover ground up restoration.

Mater 2007 F-250 Lariat 4x4 6.9L IDI, T-19 trans pushing a 7'6" Western plow. Completely assembled from the tires up!


I got your "Jeep Thing" now it burns when I pee.
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Old 03-27-2005, 03:06 PM   #9 (permalink)
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Re: 7.3L Block Woes

so u did buy the new motor to put in?
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