Where are the fail-points for oil pressure?

[jeepbeep]

I had one 3.7 go from main bearings not getting enough oil, and now have another that has annoying timing chain and valve rattle when cold. Where are the failure points? My guesses:

1. Oil Pickup tube clogging do to shield design
2. Sending unit leakage
3. Obscured channel design restricting flow

The sending unit harness(like a lot of the main harness wiring) is also right against the engine and stretched tight. I wonder how many owners don't even have a working oil light?

I don't really see where the pump can go bad besides the bearing. It has big channels and a solid design.

 

[Tog]

The timing chain tensioners are a common thing to go mine went all of a sudden drove to work no rattle drove home rattle. I believe also that the oil light is only for low pressure not low oil so it is likely that it will only come on if the pump fails.

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[teeje]

What happens is the tensioner fail to keep pressure. When sitting the oil pressure bleeds down. At some point they'll fail altogether. Had this issue before I had a new engine put in. Replaced the whole timing kit then months later (guess faulty part) failed and jumped time

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[jeepbeep]

Yeah I could change it easily on a day off, but the fluids and a quality timing chain kit will cost hundreds(I don't know the OEM numbers but aftermarkets are around $300), and this seems to occur less than 100k intervals.