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Never-the-less, I agree with Blade that using a steel roll pin in an aluminum boss is not an optimum design given its critical location, the vibration and temperature swings these engines are subjected to. I also appreciated the excellent video as well as the fix Blade came up with. According...

Wow, two oil pump failures caused by roll pin coming out. Interesting that both units had over temp shutdown. Sounds like the roll pin capture seat in cover expanded more than the roll pin to the point it lost its holding friction. Perhaps there were some manufacturing defects issues in the...

Yep, the oil pump was good until the foreign object, loose roll pin, entered the scene and tried to mate with the oil pump.

Just out of curiosity... how many hours on the engine when your pump met its demise? Just wondering if there is a trend of any sort developing. beyond a certain hour range.

Good job on doing the necropsy! From the sounds of it, the gear shaft just failed. Might have had a small flaw in the gear shaft during manufacturing. Regardless it went 6k+ hours before failure. So gear/shaft had a reasonably long life never-the-less. I don't think your louvers not opening...

Once you remove the old oil pump maybe you should see if you can take it apart and inspect internals of oil pump itself? I just feel like there is more to the story here... One SS member here ran his MEP-002a for 22000 hours and said he couldn't kill it! Of course, not all parts for same...

Very strange failure. The mystery remains as to what caused the oil pump gear shaft to break at that particular point along its shaft after 6k+ hours. Either the shaft had a mfg defect, or something ended up getting lodged between the teeth and created enough force between the mating gear...

Since you ran the engine after your oil change with a new oil filter and it ran for 1.25 hrs until the oil pressure safety circuit shut it down, obviously that means the shaft/gear broke then. It might be a good idea to see if you can open up the prior oil filter it was running on if you still...

Here is some info I pulled from a copy of an Onan DJB manual that may help: "OIL PUMP The oil pump is mounted on the front of the crank case behind the gear cover and is driven by the crankshaft gear. Rem oval: 1. Remove gear cover and oil base. (See ENGlNE 2. Unscrew intake cup from pump. 3...

Wow glad you found the problem! This is the first ever oil pump failure I have heard of on a MEP-002a/-003a. I wonder why the oil pump drive gear decided to break off at 6,414 hours? Wonder if there was an inherent defect in the gear shaft metallurgy all along and years of heat/cooling...

OK, just throwing some thoughts out here... Wondering if its possible that the new oil filter had some foreign debris in it that came out after initial start up after the oil change, or something entered system during oil change, and plugged an oil passage? It doesn't take much to block an oil...

Followup post deleted. Nevermind, I re-read your earlier 11:56 am above post and now see you already did the pressure switch jumpering.

Just out of curiosity...What year -002a and how many hours on Hobbs? In the years I've been following the MEP-002a/-003a's here on SS I haven't heard of anyone experiencing an oil pump failure, if they have it hasn't been mentioned here that I recall. Does not mean it can't happen though...