The Stovebolt Site Forums The Shop Area Engine Shop 235 oil filter

Changed the oil filter today for the 1st time, all it did was confuse me. Yeah, something that simple! Here are some pics of the Oil filter canister, and what I could figure out as to the flow of the oil. So the oil comes into the filter via a big ol 5/16 line, and leaves via a .043 hole! Guess that explains what I read about only 30% gets through the filter, its amazing that much can get through that hole! Am I understanding this correctly?
Ed

I'd certainly have to agree with ya on this one fred! After cleaning up the SC-655 filter that I picked up at the swap meet last month that seems to be the only way the oil has to get back to the engine. Seems kind of usless, I suppose thay had to do that to keep from loosing all the oil pressure.
Denny Graham
Sandwich, IL

I believe that is correct.

fredoly I am confused also. The pressure line comming from the block (where the oil pressure guage is connected) is going to another T that connects to your head near the coil. This line is doing nothing but by passing the filter. Why is this T nessary at the filter? It would seem that this would lower your oil pressure. That is why the orfice is in the filter, to keep the oil pressure up. All of the filter cans that I have seen have had only an in and a out line without any T's involved except at the oil pressure guage line. If it were mine I would remove that T at the filter and see if it increased my oil pressure. My 02.
Tom

That was something else that confused me also, 235 Fat Fenders. Just why is that oil line going to the elbow up above and between #3 and #4 spark plugs (the pic labled - To other side of "T")? What will I loose if I disconnect it? Hmmmn, maybe only 1 way to find out... :confused:

It's possible that the PO installed this line into the head because there was no oil to the rocker arms. You may have more problems by removing it. It may be possible that the internal oil passages are plugged. This was a common problem for Ford "Y" blocks.
Fred

Idon't have a panel or burb but my 61 Apache w/235 does not have a line to the right side of the engine. Before I got my truck from my DaD he must have changed it. At the tee on the block one lie goes to the filter (straight through) and the other goes to an oil pressure switch. At idle it runs about 25 lbs of pressure and while driving under normal conditions it runs about 30 - 35 psi. just curious as to whether or not all 235,s had the other fitiing by the plugs.

The other fitting by the plugs on my truck is a pipe
plug, no oil line to it. (my 2 Cents)

if it ain't broke..............

Where that oil line is hooked up is just a pipe plug and has nothing to do with the rocker arm assembly, unless someone has modified the rocker assy. Pull the rocker cover and see if this has ben modified, if so leave it, if not it will just drain into the head and be of no use and keep your oil pressure down.
Tom

Took the rocker cover off and posted some more pics , can't really tell if it has been modified. Tried to push a piece of safety wire through it, wouldn't go. Like Darin367 says......

Actually, that plug is to cap off the hole where the passage was machined for the rocker shaft oil supply. If you look in the hole in the pix, you can see the head bolt that goes through it. I would say that if there is an oil supply problem that a po was trying to fix, it's either the that thre's a blockage in the supply ports in the block itself, or the line that runs in the lifter area is crimped/blocked.

Yep, check out page 6-5 figure 4 - lubrication system of the (55) shop manual.
Fred

To All
Yes that is a Factory drilled port that was plugged in direct line with the oil port to the rockers.
Years ago it was a Fast and Cheap fix to alleviate a plugged up INTERNAL oil passage to the rockers.
Simply tee the oil pressure sender port and put a piece of copper line around the back of the block to the center of the head and WALLAH,instant oil to the rockers
Regards ,