LF777 by-pass filter - Diesel Forum

sdan27 · 05-15-2005, 03:16 PM

I installed an LF777 by-pass filter on my truck this weekend. I found that cummins had a filter base available especially for installing the 777. The base had a restriction already built into it on the return side so i didn't have to worry about any of that stuff. I ended up putting it back and behind my transfer case. I've been driving it around for about a day now and it's been good so far. My oil was about a quart low when i installed the filter and after i fired my truck up i checked it again and it took about a gallon to top off the oil level.

444-4D · 05-15-2005, 03:38 PM

The filter bases I have seen have a .090 passage. That is too big for a 7.3. What size was yours?

deeretrac · 05-15-2005, 05:46 PM

[ QUOTE ]
The filter bases I have seen have a .090 passage. That is too big for a 7.3. What size was yours?

[/ QUOTE ]

according to Amsoil parts list the orfice in their bypass filter bases is .092 inch. so why is it too big for the 7.3?
here is the link. look toward the bottom.
amsoil

Rob

DeiselDaddio · 05-15-2005, 06:54 PM

[ QUOTE ]
[ QUOTE ]
The filter bases I have seen have a .090 passage. That is too big for a 7.3. What size was yours?

[/ QUOTE ]
if that is the wrong size what is the correct size? [img]/ubbthreads/images/graemlins/confused.gif[/img] i just want to be sure what size is correct i dont want to guess [img]/ubbthreads/images/graemlins/shrug.gif[/img] [img]/ubbthreads/images/graemlins/shrug.gif[/img]

BlueMule · 05-15-2005, 07:11 PM

Kirk
Take a look at the link Rob posted.Item #7 in the parts and assembly list ia a Restrictor Assembly (.092")

https://www.amsoil.com/bypassfilters...ons/bmk12.aspx

444-4D · 05-15-2005, 07:39 PM

[ QUOTE ]

according to Amsoil parts list the orfice in their bypass filter bases is .092 inch. so why is it too big for the 7.3?
here is the link. look toward the bottom.
amsoil

Rob

[/ QUOTE ]

If Amsoil recommends a .092 for a 7.3 you will have to ask them why they recommend it, I don't know why.

I do disagree with the recommendation. I think it is to big. I wouldn't go over .040 on a fixed orifice.

deeretrac · 05-15-2005, 09:58 PM

[ QUOTE ]
I do disagree with the recommendation. I think it is to big. I wouldn't go over .040 on a fixed orifice

[/ QUOTE ]

why? will it cause to much loss of oil pressure?
im just trying to find the right orfice for my setup without hurting my engine.

Rob

sea97stroker · 05-15-2005, 11:12 PM

I went with a 1/16 drill bit that is roughly .060, i have no drop in oil pressure.

Steve

444-4D · 05-15-2005, 11:13 PM

[ QUOTE ]
why? will it cause to much loss of oil pressure?

[/ QUOTE ]

The only way to know exactly what effect it has is to monitor the before and after oil pressure. My concern would be at hot idle.

DeiselDaddio · 05-16-2005, 11:27 AM

Rodney
i put a b-100 on my truck with i believe a .060 and have had no problems but this 444-4d dude has been giving Rob grief since we were on the other bypass post and i did check it out(amsoil) i hope for replies from folks like you nit ,joat dale,rob you have this stuff called documentaion or web sites that do so thanks for that a bunch. 2 years ago i couldnt spell diesel and for folks like you all give me a wealth of info thank you kirk [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

sea97stroker · 05-16-2005, 09:42 PM

I don't see anything wrong with .060, i am not changing mine till someone shows me i'm wrong.

Stevo

DeiselDaddio · 05-16-2005, 10:15 PM

i re read the bypass thread and i put a .050 restristion sorry for the miss information also there was something about .035-.090. is the average range of most researched restrictions out there. kirk