DIY LF777 Oil Bypass Installed. - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 14 (permalink) Old 09-29-2010, 01:52 AM Thread Starter
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DIY LF777 Oil Bypass Installed.

I installed my DIY LF777 oil bypass filter today. The filters get down to 3-5 micron and are 15.00 at Napa when they are on sale. This filter added 2 qts to the system. One of the fittings on the return side I tapped and installed a set screw in and then drilled a hole in the set screw with a 1/16 drill bit to serve as a oriface. I used 5/16 tranny hose that is rated at 400 psi and push lock fittings. I think I have about 75.00 in this setup.
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post #2 of 14 (permalink) Old 09-30-2010, 02:26 AM
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Re: DIY LF777 Oil Bypass Installed.

Mind me asking what is the part number of filter head? TIA!

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post #3 of 14 (permalink) Old 09-30-2010, 08:52 AM Thread Starter
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Re: DIY LF777 Oil Bypass Installed.

I will get it for ya..it is a fleetgaurd number, I will post it friday.
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post #4 of 14 (permalink) Old 10-01-2010, 01:42 AM
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Re: DIY LF777 Oil Bypass Installed.

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Originally Posted by Sea97Stroker View Post
I will get it for ya..it is a fleetgaurd number, I will post it friday.
Found it!

Cummins 3304173S
Baldwin OB1308

2002 F-350 ECLB SRW 7.3 4R100
6637 203* t-stat 08 diff cover Stancor HPX 6.0 trans cooler, Zone offroad leveling kit, Western UM 8'6" plow

Sold: 2004.5 Ram 2500 w/ 5.9 CTD, Reg Cab 48re
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post #5 of 14 (permalink) Old 10-01-2010, 03:09 AM
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Re: DIY LF777 Oil Bypass Installed.

awesome!! Any more detailed pictures?

nice work!
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post #6 of 14 (permalink) Old 10-01-2010, 08:35 AM Thread Starter
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Re: DIY LF777 Oil Bypass Installed.

That is all the pictures i took. Feed line comes off of the 1/8 plug on the oil filter header, return was hooked up to one of the plugs on the side of the engine.
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post #7 of 14 (permalink) Old 10-02-2010, 07:19 AM
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Re: DIY LF777 Oil Bypass Installed.

did you just come up with this or did you follow a writeup?

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post #8 of 14 (permalink) Old 10-02-2010, 03:38 PM Thread Starter
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Re: DIY LF777 Oil Bypass Installed.

I did a bunch of reading and come up with this contraption, I did another years ago with info I got on TDS, people have been using this filter for a long time.
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post #9 of 14 (permalink) Old 10-03-2010, 05:23 AM
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Re: DIY LF777 Oil Bypass Installed.

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Originally Posted by nation1979 View Post
did you just come up with this or did you follow a writeup?
Different filter but good write up....I am going to replace my Amsoil bypass with this set up(B164) when I change me oil. 15 absolute, 1-2 nominal and like 8 bucks a pop.

2002 F-350 ECLB SRW 7.3 4R100
6637 203* t-stat 08 diff cover Stancor HPX 6.0 trans cooler, Zone offroad leveling kit, Western UM 8'6" plow

Sold: 2004.5 Ram 2500 w/ 5.9 CTD, Reg Cab 48re
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post #10 of 14 (permalink) Old 10-06-2010, 09:22 AM
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Re: DIY LF777 Oil Bypass Installed.

Great job. I really love seeing people make their own stuff. I think you always take more pride in something when you have had a hand in building it. "Built Not Bought" as they say.


I have installed one bypass based on the Luber Finer ZGard and am installing one with their largest one on my current Xcursion. Between the Luber Finer bypass and the primary full flow filter I use total capacity will be 20 quarts or 5 gallons +25% over stock. With the bypass lines and dual stealths HPOP and extend res etc it will likely be closer to 21-22 quarts I am thinking. We will see. The primary full flow filters down to 10 mic@99.99% and 4 mics @ 75% first pass. the Luber Finer bypass is 2-3 absolute and even lower at nominal.
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