Diesel Fuel Filter Type and installation question

21hunter

Member
I have a Massey Ferguson 175 tractor that I'm replacing the fuel filters (Part #1851 890 M1) on. The filters are the CAV 296 type used on many tractors. Attached is a picture of the filters. The original filters are on the bottom and the aftermarket replacements on the top. The inlet side of the filters is on the left? and the outlet on the right? of the picture. The original filters have a solid plate to cap the end thus the fuel is forced to flow from the outside in or inside out depending on how the housing is plumbed. The replacements do not have the plate and it appears that fuel could flow axially through the pleats from one end to the other. Shining a flashlight through the slots on the one end of the filter reveals large gaps in the pleats and appears as if the fuel would not be filtered at all. My question is; are these the wrong filters for this housing? Am I overlooking something?
Thanks
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Doesn't look right to me. Where did you get the filters and did they look up the right engine? Know there are more than one engine on the MF 180 and different filters there. Think 175 and 180 are similar engines.
 
You have them backwards, the TOP left-right is the original CAV 296/796 filter style the tractor came with. All the small outer top holes are the fuel in, the center is the fuel clean-out passage after fuel has gone down through the filter. The lower filter is the NAPA/WIX design filter, the fuel inlet is the top OUTER groove next to the case seal lip. That's where the mistake is often made of putting an "extra" O ring in the groove, stopping or restricting fuel flow. Also make sure on both filters the O ring is in place for the center tube top, or the fuel will by-pass the filter. Either are fine to use.
 
I have several engines which use those filters. In most cases, there are two. My 2520 JD farm tractor only uses one!
The diesel shop which overhauled the in line pump on my Ford 655A backhoe, said to only use the solid packed filter, not the pleated paper one, with this particular filter. Maybe that's what they sell?! If the installation uses two filters, and especially if one has a sediment/water bowl under it, then I doubt it matters.
 
Okay, Dieseltech; I understand what you are saying but I still have a question or two. Say the fuel goes in through the top holes then it must exit through the slits (half moons) on the bottom. To me this means the fuel travels lengthwise through the channels in the media. If I shine a light through the slits on the bottom and look into the 1/4" holes on the top then I see the light shining through the channels (see pic) going up through the media. I don't see how this will filter the fuel that way. Or is it possible that the media swells up when wetted with fuel to close the channels up? Otherwise it still doesn't make sense to me
<image src="http://forums.yesterdaystractors.com/photos/mvphoto970.jpg"/>
 
The fuel goes sideways through the ones I removed. The new ones in question have a solid tube from top to bottom in the center and have a loose fit (no sealing) around the threaded tube on the housing. I see no other path than straight down through the media then back up the space between the solid tube in the filter and the threaded retainer tube on the housing to the exit port. Unless the light I'm seeing through the media is an optical delusion?
 
The loose fit tube is where an O ring needs to be in the center base neck the filter top center fits over. BOTH filters need that O ring in place or the filters will not work. I checked a new CAV 7111 796 I have on hand, it's the same as the 7111 296 filter only longer. I could see light through that one also. If the CAV filters are cut apart you would be surprised how much filter media is in that small can..
 
(quoted from post at 11:27:30 07/23/17) I have a Massey Ferguson 175 tractor that I'm replacing the fuel filters (Part #1851 890 M1) on. The filters are the CAV 296 type used on many tractors. Attached is a picture of the filters. The original filters are on the bottom and the aftermarket replacements on the top. The inlet side of the filters is on the left? and the outlet on the right? of the picture. The original filters have a solid plate to cap the end thus the fuel is forced to flow from the outside in or inside out depending on how the housing is plumbed. The replacements do not have the plate and it appears that fuel could flow axially through the pleats from one end to the other. Shining a flashlight through the slots on the one end of the filter reveals large gaps in the pleats and appears as if the fuel would not be filtered at all. My question is; are these the wrong filters for this housing? Am I overlooking something?
Thanks
&lt;image src="http://forums.yesterdaystractors.com/photos/mvphoto969.jpg"/&gt;
a166898.jpg

On the MF 135 that was y Dad's I replaced the housings and filters with these SFA11 FILTER ASSEMBLY WITH DELPHI 496A SCREW ON FILTER PORT SIZE 1/2"-20 UNF units

This was at the suggestion of PTFARMER and while it was mildly painful I would not go back now. Makes the change out easier in the future.
 

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