Got some weird scoring or damage on my boundary stage 2 oil pump - almost looks like the gears were pressed against the backing plate and grinding it down. Anyone seen anything like this before ?
The housing itself looks fine upon initial inspection. The outer larger gear has some scoring on the outer round side surface, I can easily feel those with my fingernail (pic 5 & 6).

Unclear if I can reuse the pump or need new gears ?












Some backstory:
Had a high comp 1.8 NA BP naturally aspirated engine built with forged pistons in 2023. Compression and leak down test was good but it never sealed proper, rear main always kept leaking - 6 different seals including 3 oem swapped during the 3 years and ~30.000 km run time.
Engine also consumed oil from the beginning - 0,5l every 1000km at the minimum from the get go. Up to 1,5l / 1000km during the last year. Head was pulled and valve train inspected from a shop in 2024, no apparent issues found. Always suspected some issue with the hone job or rings. At this point engine also started leaking from the front.
Finally pulled and completely disassembled the engine last month and it's shot. Wear marks all over the cylinder walls, crank/bearings and rod bearings. Cylinder head also shot - cat cams stage 1 scored on the lobes, cylinder had mating surfaces scored, hydraulic lifters scored.
Forged pistons survived luckily, rings and ring gaps checked out fine so that wasn't the issue. The hone by the machine shop was pretty ***** though.

 

The pump rotors don’t look too bad on the pictured surfaces. The lobes are more important and clearance between them. The picture of the cylinder wall is a bit concerning, but I can’t tell how deep the anomaly is.

 

Also Checked the pressure relieve valve today - piston was sitting at the bottom of the channel. Both piston and bore are marred where they we're contacting.


Rest of the pump body seems fine. The scuffed areas on the backing plate are smooth. There was no debris anywhere in the pump.


the engine pictures were just for reference, block, head and cams are toast. But all this makes me wonder if the oil pump damage was cause or effect of the disaster.


Now building a vvt engine with the high comp pistons.
Yay

 

Unfortunately you'll never know if it was assembled improperly or if something was wrong with the oil pump to begin with. Debris in the engine will eventually go through the oil pump, since it picks up unfiltered oil before pumping it to the filter, then to bearings.