OBS UVCH upgrade to Superduty - How I did it - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 49 (permalink) Old 02-08-2017, 01:50 AM Thread Starter
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OBS UVCH upgrade to Superduty - How I did it

Short version, my 1997 OBS 7.3 truck has 202K miles on it. When I got the truck the stock Under Valve Cover Harness was a disaster. Melted, soaked in oil, broken wires, etc.
I replaced both sides with new Dorman valve cover gaskets and wiring pigtails in 2014

Only a few hundred miles later I learned about the upgrade from problematic OBS UVCH (dual plugs, smaller pins) to the updated Superduty version.
The Superduty valve cover gaskets have larger pins for the GP power leads then the older OBS units.
New parts are FAR SUPERIOR to the Dorman pieces
Having a single hookup instead of two eliminates some wiring and connections.

Shopping around for OEM quality UVCH you will find it is not cheap to replace the wire pigtails (truck side), gaskets themselves and the under valve cover harness. Between $250-500!!!
I settled on Alliant wiring pigtails gaskets and wiring from Riff Raff.

They sent me
2ea Alliant pigtails part number Ap0016
2ea Navistar? Alliant Gaskets Ap0014 / F81Z6584AA
2ea Injector / Glow plug harness F81Z9D930AB

I researched the wiring portion of this swap and found the info I needed here on PSN courtesy of SBluke.

Quote:
So SD wiring
Pin 1,2,8,9 are glow plugs.
Pin 3,4,6,7 are injectors
Pin 5 common.

Obs wiring
Pin 1,5 are glow plugs
Pin 2,4 are injectors
Pin 3 is common.

So let's make the sd pin 1 the front pin.
Let's make the obs front connector 1-5, front pin 1
Let's make the obs back plug 6-10, front pin is 6.
So connect SD pins 1,2,8,9 to obs pins 1,5,6,10
Connect SD pin 3 to obs pin 2
SD pin 4 to obs pin 4
SD pin 5 to obs pin 3 and 8
SD pin 6 to obs pin 7
SD pin 7 to obs pin 9

Hope this makes sense...


I took this a step further and created a simple chart (I'm a cad operator by trade so..... can't help it)


You can download the PDF file here:
http://fortuneelevatorconsultants.com/F350/UVCH.pdf

Wire colors truck side may not be 100%. My 1997 harness is faded! and my eyes are getting older

Step one is to prepare your engine side & valve covers! CLEAN CLEAN CLEAN
Clean the new gaskets of any lint or grease, these gaskets are fit dry
Install the under cover harness into new gaskets, they click into place in several spots
Perform 50 cent mod here if you wish, I did not see the need, these gaskets fit tight

Next we cut out the Dorman / or stock pigtails ONE WIRE at a time
I started by stripping back factory pigtails to their junction at main engine harness.
You will see the 4 glow plug leads are joined upstream all in one union
Separate the GP leads from the remaining 3 wires per OBS pigtail (6 wires total)
Save the factory bare wiring and foil tape, long enough to re - insulate your new pigtails

You can now match each wire up one at a time until all 10 wires from truck are hooked to all 9 leads at new SD pigtail
I chose to make all 9 solder joints at once, then heat shrink.
All leads were wrapped with factory bare wire / shielding wire and then foil.
Only the INJ and COMM leads need to be insulated.
Keep the GP power feeds separate (not shielded).

I then wrapped shielded injector bundle with a full 2 rows of electrical tape.
Next wrap GP power leads into same bundle
Finally whole pigtail gets plastic conduit to protect it, zip tie to keep everything tidy

Before, dorman pigtails from 2014 (don't try and save $$$ here, not worth it!)


Dorman removed, plastic melted, pins bent and loose in housing:





Wiring work / Finished product







I fired the truck up afterwards and shes running fantastic
I am very happy with the results, $$$ well spent

Thanks PSN!!


1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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2001 Excursion 7.3, auto, 4x4, 3.73, 6" Suspension lift, 37" Dick Cepeks
2000 E350 7.3, auto 2wd, 3.73, planning a TTB 4x4 conversion
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post #2 of 49 (permalink) Old 02-08-2017, 04:01 AM
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Re: OBS UVCH upgrade to Superduty - How I did it

Nice write up. Its now a sticky.
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post #3 of 49 (permalink) Old 02-08-2017, 01:10 PM Thread Starter
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Re: OBS UVCH upgrade to Superduty - How I did it

Thanks for all your help! Very worth while upgrade and peace of mind knowing I have good solid connections under there
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1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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2001 Excursion 7.3, auto, 4x4, 3.73, 6" Suspension lift, 37" Dick Cepeks
2000 E350 7.3, auto 2wd, 3.73, planning a TTB 4x4 conversion
21.9 liter family
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post #4 of 49 (permalink) Old 02-10-2017, 02:31 AM
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Re: OBS UVCH upgrade to Superduty - How I did it

Nice write up. I just noticed one of my connections is starting to weep oil. Definitely going to fix it this way.
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post #5 of 49 (permalink) Old 10-27-2017, 02:34 PM
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Re: OBS UVCH upgrade to Superduty - How I did it

Excellent write up, love the wiring diagram! Good thing I built a shop on my property, it may be necessary being that my wife will be opting for "separate living quarters" due to my OCD upgrade tendencies. haha!
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post #6 of 49 (permalink) Old 10-27-2017, 03:44 PM Thread Starter
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Re: OBS UVCH upgrade to Superduty - How I did it

Thanks Fella's! Its the least I can do to give back for all I have been taught

1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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2001 Excursion 7.3, auto, 4x4, 3.73, 6" Suspension lift, 37" Dick Cepeks
2000 E350 7.3, auto 2wd, 3.73, planning a TTB 4x4 conversion
21.9 liter family
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post #7 of 49 (permalink) Old 05-12-2018, 08:48 PM
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Re: OBS UVCH upgrade to Superduty - How I did it

Is dielectric grease recommended / necessary on the plug connections?
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post #8 of 49 (permalink) Old 05-12-2018, 09:15 PM
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Re: OBS UVCH upgrade to Superduty - How I did it

Not necessary. They have seals...

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1979 chevy c30 dually, sm465, 373's? Converted to 6.2 diesel, pump turned up and advanced a hair.(wrecked)
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post #9 of 49 (permalink) Old 10-06-2018, 01:44 AM
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This is a great write up, read it a few times before. Tonight was going to be a refresher as im tackling this tomorrow morning, sadly the pics are no longer up. Anyone got some pics of this? If not guess i will have to snap a few tomorrow

97 F350 4x4. 54xxxkm
Reg cab 8' Box
Just starting to pick at it
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post #10 of 49 (permalink) Old 10-06-2018, 02:10 AM
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Re: OBS UVCH upgrade to Superduty - How I did it

If you would like to see his pictures send a PM to 410customs, he is still a active member here and might be able to get back to you before you start.

But it is a fairly straight forward upgrade as long as you pay attention to what wire goes where and get good connections through the soldier joint.

96 F250 XLT 4x4, 4:10 gears, 5 speed, Tymar intake and HX hose, downpipe, pyro and boost guages, coolant filter, Luc clutch
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