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So I tested this today with the oil level half way down between "F" and "E' on the dipstick and I can't tell if its my imagination and poor scientific method here or if it actually did improve but it felt a little better. Started off at 42psi cold as usual, and once hot I was at about 30psi at...

Oh gotcha, nothing like that, its a sailboat and maximum speed is around 7-8mph with this engine, which doesnt change the angle by any significant amount. This engine was used on tons of these boats and has a very healthy online community but this topic only ever leads to oil sensor or cam plug...

I wondered the same and used a temp gun at one point to measure the temp of the front cover at the bottom and oil pan and the highest i could find was low 200s hot which didnt seem unusual. I run a 160 thermostat on this engine while some others run a 180 thermostat so i think im running cooler...

Yes i wish i had known to check it but good to know its one possible cause...if i have no luck with other paths i could always make it a winter project to take the cam out and measure it and the block. Thanks for the comment

Thank you sir, yes the boat angle changes a lot with rocking and yes like you saw the dipstick tube is a marinized thing on this engine because the modified exhaust manifold blocks the standard dipstick location. I brought the oil level down to half way between full and empty...which really...

Thanka great tip, this engine doesnt really get run in the cold so will definitely try a straight weight oil to see if it helps. Continuing from JohnDB's tips, i took the dipstick and marked the tube on the outside approx where the full line is when dipstick is seated, and its definitely above...

Yes confirmed that plug is in as well, and had taken some photos during rebuild where we can see the back of the cam, added to original post. I wish it was something simple like that!

Since there are no bearings in the cam to block, I was not aware that checking them was a thing, so that is one thing I didn't do that could be a potential cause of my issue. But of course it's a lot of work chasing a potential wild goose. I did check all bearing clearances and with the new...

Wow, interesting to hear that I'm not the only one, I think your model engine is very similar to mine. I wish I could find out what's causing it, its hard for me to avoid idle because on a boat I need idle speed for docking, so its problematic to have to wait a while to get down to idle without...

I was worried about something like that, i took off the pick up and cleaned it very thoroughly when i did the rebuild, but i wasn't looking for a crack...if it were obvious maybe i would have seen it, but i didn't think to examine it very carefully. In this application getting the pan off is...

Yes it is indeed on a boat, and the engine is angled about 7 degrees with the back being lower to match the angle of the prop shaft. No side to side angle. This d950 engine was used in thousands of these boats (and the d850 before that in older models) and I was unable to find much chat about...

Those are really interesting ideas JohnDB thanks for giving me something else to think about. I checked the part number stamped on the dipstick and it shows up as a d850 dipstick, and the d950 dipstick has a different part number. I wonder if it was replaced with the wrong one at some point in...

Hi all, looking for advice, I searched all the threads here about oil pressure that I could and haven't found a solution. Unfortunately it's not a missing cam plug, and it's not the oil pressure sensor. I have a d950 engine that has had low oil pressure when hot since I got it. I added a...