Better be safe than sorry...If all else fails drop the sump.
i had one engine (MK 2 Ford Cortina 1600) years ago that made a horrible noise, but it turned out to be a dent in the sump flange fouling the big end cap as it swung past.......... funny things can happen!
I had the sump off and I think the problem is the strainer on the end of the lubrication pump suction pipe. It is held in place by a spring and can dance around and move up and down with sump oil movement. Does anyone know if welding it solid would work and why does it have to float around on a spring anyway.
I did see a half a semicircle and a smaller circle engraved in the bottom of the sump under the suction strainer and of the same size as the suction strainer. The oil relief valve return hole is angled to fire oil towards the suction strainer if pressure was high enough. This could be what is causing the suction strainer to dance around and make the noise.
The sump is cast iron. I can see where the strainer hits the sump. Why does the strainer have to be flexible and not welded to the suction pipe 5mm off bottom.
Typical on DAF 620 engines... you could count the occasions on one hand, but enough for our service department to check at every oil change by feeling through the drain hole...Check also that the pickup pipe is not loose in the pump (or whereever it is attached on a 10641)
i have seen pickup pipes come loose and foul the crankshaft...... that makes them rattle!
I have seen other compressors fail the valves before, and blow the pieces of them back up into the intake manifold and into the engine, so it may pay to not use the compressor until you get a new head on it
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