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Thanks Ron. I did make sure the input shaft was 10 spline. I'm thinking I can just pull the bell house off the old box and bolt it onto the new box.

I should also mention that I am replacing the shaft so shortening the shaft will not be an issue. I know the HBW 150 protrudes back another 1.5" or so. Other than that, there looks to be plenty of room to accommodate to larger gear box. Just wondering what other implications there may be using this gear box with the M25XPB.

My HBW 50 is shot and I just found a good deal on a rebuilt HBW 150. Is there any reason an HBW 150 couldn't be used on a M25XPB? I was planning on going with an HBW 100 (ZF 10) but the 150 is a good price.

The oil pressure is 60-70lbs at around 2200 RPM which is where I generally cruise. I haven't had a chance to investigate further but I'm thinking something was bottoming out on the fitting or something random like that. Hard to imagine that I had four bad filters. I brought the boat home over the last few days from the far east end of Long Island (New York) to Nyack on the Hudson. Total of 26 hours motoring (wind on the nose entire trip) and the engine ran like a top. One other question. How much oil does the sump hold in this engine? In the M25XPB Operator's Manual, it says four qts but the Kubota specs say five qts. It seems to take about five qts to bring the oil near the upper mark on the dipstick.

So we got it fixed today. The mechanic came over and checked the filter first. He put on a new Fram PH-3593-A, the same type of filter I had tried three of. We had the same results, no pressure. We decided to check with a local marine wholesaler to see if they had the Universal 300309 filter in stock and they did. We put it on and like magic, we had oil pressure. I know many other M25XP/B owners who use the Fram filter successfully so I'm really not sure what went wrong unless we had a total of four bad Fram filters. Maybe the M25XPB has a slightly different filter fitting, pressure relief valve or something else, than the XP? I thought that the XP and XPB blocks were exactly the same (Kubota D950) with some differing bells and whistles from Universal. Happy to have it running properly again but quite confused by the filter issue. The Fram PH-3593-A cross references to the Universal 300309 from what I have read.

I will be sticking with the engine. Hopefully, after this gets resolved it will be a reliable engine. I certainly appreciate all the help and I'll post the resolution once I get this resolved (hopefully soon!).

Thanks for all the replies but I'm pretty certain it's not an electrical issue.  I'm using a mechanical gauge attached to the sender port to measure pressure. I disconnected the hose that runs from above the oil filter down to the sender fitting and turned the engine over for a few seconds to see if oil was being pumped through the hose and there is definitely no oil be pumped through. I broke down today and asked a diesel mechanic to take a look tomorrow. Have a feeling that something is blocking the pickup tube or screen. In over thirty years owning and working on marine diesels, I've never seen an issue like this. These Universal engines seem to be quite problematic. The PO had to replace the heat exchanger twice, lift pump, starter, raw water pump, transmission and had a host of smaller issues and the motor has less than 700 hrs.

I did clean the fitting out. I also used a hose and blew some oil through the oil filter fitting and it came through the outlet hose with little effort. I let it run for about 30 seconds and it barely registered a single psi. The only things left are the pickup and pump but I just can't imagine either going suddenly.

Should also add that I used Heavy Duty 15W-40 Diesel motor oil and a Fram PH-3593-A filter.

Have a strange issue with my M25XPB. First of all, the boat/engine are new to me and the boat has sat in dry storage for about two years. I had the diesel tank cleaned out and put fresh diesel, a new Racor etc on and the engine fired up and ran perfectly. Oil pressure was between 50-60 psi when I was warming it up. I then changed the oil and filter, checked the oil level and fired it back up. The alarm never shut off and the oil pressure gauge was reading 0 psi. I shut the engine down and checked the oil and the level was fine. I then tested the switch by grounding and it seems to be fine. To rule out the sender, I fired it up again and tested with a mechanical gauge. It was reading a little less than 5 psi with the mechanical gauge. I pulled the hose that goes from the block (above the filter) to the sender switch fitting and cranked the engine over a few times and it seems that no oil is pumping through that hole (the one in the block above the filter). There was oil in the new filter, so it seems that oil is getting from the pump to filter.

I find it very odd that this happened so suddenly. What could be blocking oil flow between the filter and the sender (and rest of the engine)?