A lot of these older engines seem to have some scary blow by yet they still run pretty well. I almost wonder if its a 617/616 crankcase vent design thing.

A tight engine should have slight suction, IE put a sheet of paper over the oil fill hole and it will slightly suck it down. For a demonstration try it on any 603/6 or modern MB gas engine.


I have seen a ton of 617's that do the tea kettle thing, and they all seem to run good. I have yet to see a 603/6 that does that. I almost wonder if its the crankcase vent system? I'm to lazy to look it up, but I wonder what the difference is. Anyone with a FSM that cares to look?

__________________
2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200