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A Whatsit for the Truck Guys

J

Jeff NWOH

Member
I have a 99 GMC C6500 that's been sit ting out back for a while. I drug it up today to see if I could get it started. It has this tank down below the drivers door right next to the air drier.

I had assumed it was an air tank. Noticed it seems to be leaking a little oil so I investigated a bit. It has two hoses. One goes to the block where the engine oil pressure sender connects. The other goes to the oil pan. It's approximately 8" diameter and 12 or 14" long.

So is this some sort of external oil filter? Some sort of extra oil storage? If so, can I just eliminate it? One of the mounting clamps has rusted in two, and I doubt it will be long before it's spewing oil. It's a 3126 Cat engine. I have a 3116 in another truck that doesn't have one of these.

So, what is it and do I need it?
a248073.jpg
 
Looks like a Luberfiner to me, an extra oil filter with a spinner inside that uses centrifigal force to remove the dirt from the oil. I'm not sure how they work with the regular filter tho so don't know about removing them.
 
That i what they call a Luberafiner . It is a large capacity filter and it also give you more oil capacity . Do you need it NO , is it a good thing yes many years back all diesel trucks Med and H D trucks had and used them . I even ran one on my one Ford car with the built 390 due to the fact that the spin on filter would not take the oil pressure that the oil pump made and it gave me and additional gallon and half more oil .
 
Sinse it is leaking, and it looks somewhat rusty, my choice would be to remove it. Leaving something like that runs a risk of the engine suddenly loosing enough oil to cause damage if the driver doesn't catch it in time.

You say it is plumbed from the sender unit, (which is pressure), and back to the oil pan, (which just returns oil to the pan). That means this is a "bypass system" meaning it meters a small amount of oil from the pressurized galley, through the filter, then returns to the oil pan.

If you do remove it, plug both places the hoses are connected. Do not loop the hose back to the oil pan.
 
I suppose there was a time when the "luberfiner" was beneficial. I don't think so much any more. I removed the one that was on an old Steiger I had.
 
It looks like a luberfiner. Its is a by-pass filter. You should be able to run without it. There are Spin-on by-pass filters that you could replace it with if you were worried about the extra filtration. It seems like the Fleetguard # for that spin on was LF777. I could be wrong or the numbers could have changed in the last 25+years. You would have to get a base for it too.
I actually have a filter and base that I had picked up for a project and never used. Its just buried in the shop at the old place.
Tim in OR
 
The filter element in that housing is about 9"x 18" and looks like sawdust inside! Daddy would save them until cold weather hit and burn 'em in the shop wood heater when the fire got hot. Only problem was the smoke would be sooty tendrils sometimes when it wasn't hot enough and drift over the house. If Mama had the white bed sheets on the line, Daddy'd get an earful!!
 
Thanks guys. I did some Google work on bypass oil filters. I think I will just remove it. This truck didn't have particularly impressive oil pressure the last time it was running and my thinking is that removing this "controlled leak" may help some.
 
Yeah, I burn my old oil filters and then recycle/junk the steel housings if they have any. As you say the fire has to be hot but if it is they burn just fine. I also drip used oil into my shop stove, same deal if a hot fire it burns good and adds a lot of heat using a lot less wood.
 
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