Anatomy of a Frantz toilet paper bypass oil filter

[Gary - K7GLD]

Yeah - you and me both!



Sure looking forward to our coming RVing trip up along the Oregon coast - a maiden voyage for the newly installed Frantz FUEL filter and the new LUK Cerametallic clutch - leaving in about 2 weeks - If you don't hear from me for a month or so, I'm probably hopelessly broke down somewhere between here and the Oregon coast...

 

[banzaitoyota]

After `500 miles I can read my dipstick

 

[JSmith]

Gary o-ring size?

Gary, I have 400 miles on my toiet paper filter. I want to change the paper today. What size o-ring do you use? Are the o-rings you use Viton?

 

[Gary - K7GLD]

I really don't know the size - sort of a trial and error thing - mine are of neoprene, and the local ACE hardware has an excellent size selection. Mine are getting a bit "relaxed", and could use replacing, and since I now have something to compare size-wise, may look for the same thing in Viton - or may simply play around some more and try something different. Much of what I do on this truck is an on-going rolling experiment!



Sorry I can't help more - but the O-rings are only 10-20 cents apiece - they are a snug fit to the center post, and only slightly less snug to the TP roll center - I use a twisting motion when installing the new TP cartridge onto the post to avoid pushing/rolling the O-ring down on to the bottom of the post instead of staying in place. I'm seriously considering fabricating a plain copper wire O-ring of a similar size as the neoprene one, and using that instead - just haven't done it yet...

 

[CFAR]

I'm on my 2nd roll of tp approx 700 miles, oil color = black as coal. I must have alot of soot build up to clean out. Maybe after a few oil changes I'll be clean.

 

[JSmith]

Gary, I just got through

I just changed out the tp roll. I used two viton o-rings. I set the first o-ring about 1/2 way down the post, the second o-ring 1/4 way down. I twisted the tp roll to the bottom. Put the clamp on and started the truck, no LEAK!!!!!!

 

[Froadin]

JSmith, what size are the O-rings?

I was a little dissapointed that before the end of my first roll, the thing started leaking. I had assumed it was a loose line upon install, but it ended up being the original gasket/ring. I guess it had sat compressed for some time, and even though it wasn't used, it still leaked. I swapped it out with the spare that comes with the kit, and no more leaks.

It didn't clean up my oil visually, and I haven't ran a analysis on it either. I am on the second roll, and about to do an oil change. So hopefully the next batch of oil will stay nice and clean.

 

[CFAR]

The "O" rings will not stop a leak around the base gasket, they simply stop the oil from slipping between the center post and the tp roll and bypassing the filter media(tp)

 

[Froadin]

Yeah, I know. I guess I kind of said those two things together in my last post. The base gasket leaked. And I also need the Orings for the center post.

 

[JSmith]

Froadin

I just and checked in the 0-ring bin. I am using 1 3/8" viton o-rings. Hope this helps. Also using Scotts tp. The oil on my dip stick is clean, coming out of the Frantz it is dirty. I have a little over 400 miles on the Frantz. As stated above I changed the tp roll once.

 

[Froadin]

Thanks JSmith, that saves me a little time so I can grab a few on the way home.



Now, where is the best place to get the base gaskets, Frantz themselves? I always like to have extras around.

 

[Tom W]

Make sure the filter has the restrictor fitting in the inlet. No restrictor will cause leaking at the base ring.

 

[bmoeller]

Originally posted by Tom W

Make sure the filter has the restrictor fitting in the inlet. No restrictor will cause leaking at the base ring.

On mine, it had already been installed when I got it.

 

[rbattelle]

Originally posted by Tom W

Make sure the filter has the restrictor fitting in the inlet. No restrictor will cause leaking at the base ring.

Interesting. The Motor Guard uses a restrictor at the oulet (none at the inlet).

 

[Gary - K7GLD]

"Interesting. The Motor Guard uses a restrictor at the oulet (none at the inlet). "



Maybe you plumbed it in backwards~



Normally, you want to limit the oil pressure buildup inside the filter housing - so you do the flow restriction AHEAD of the housing, not after...



On my Frantz, my restrictor is built into the oil takeoff fitting on top of the stock Cummins oil filter mount where the plug used to be...

 

[rbattelle]

Originally posted by Gary - KJ6Q

"Interesting. The Motor Guard uses a restrictor at the oulet (none at the inlet). "



Maybe you plumbed it in backwards~



Normally, you want to limit the oil pressure buildup inside the filter housing - so you do the flow restriction AHEAD of the housing, not after...



On my Frantz, my restrictor is built into the oil takeoff fitting on top of the stock Cummins oil filter mount where the plug used to be...

Nope, the words "IN" and "OUT" are clearly stamped into the filter base. This means the filter runs at full engine oil pressure. Maybe Ralph can comment on this...

 

[CTait]

A restriction in a line can only reduce the volume of flow through the fitting. I believe that if you fixed a pressure guage to the return oil side it would read the same pressure as the supply side.

Now if you had a guage that read in very fine increments you may notice a slight difference in pressures but that could be accounted to friction loss through the filter and hoses.

 

[Tom W]

CTait, you are right if you put a pressure gauge on the end of the return line and blocked the flow you would read full pressure but no flow. If you put a gauge in a tee fitting in the return line you would get essentially zero pressure.

 

[John - K5AWO]

IMO:



It doesn't matter whether the restriction hole is on the input or the output side. There will only be a small amount of oil flowing across the filter.



The slow flow rate is what makes a bypass filter work well.

 

[Gary - K7GLD]

I'll flat out guarantee you there is FAR more (full!) pressure on the INPUT side and at the head of the MG filter IF the restriction is on the OUTPUT side - sure, as flow is restricted as it passes thru the filter, it will be reduced TO A DEGREE - but not nearly as low as if the restriction was on the INPUT side! Probably no problem for the MG if seals and housing are properly designed, but still a potential issue as seals age and change over time.



I have proved this very issue when testing the Frantz fuel filter, and guaging PSI with a restriction downstream of the filter - nearly FULL pump PSI was present thru that filter with a restriction downstream, but was only reduced AFTER the restriction was REMOVED.



Granted, that was using diesel fuel rather than engine oil, but the principle applies. I'd bet that a guage tapped into the filter body of the MG bypass would register nearly FULL engine oil PSI during engine operation...