Bob Rooks
Elite Member
Okay, I have to clarify a couple of things.
1) Cracking a fuel line takes the firing load off of a particular piston/rod/journal and will tell: a) which rod is knocking, and b) if the injector is dribbling and causing fuel to enter the combustion chamber prior to set timing (not unlike pre-ignition in a gasoline engine).
2) There is no "splash lubrication" on these engines. The cylinders are lubricated through rifle-drilled passages in the connecting rods via the crankshaft, to the gudgeon (wrist) pins, and through passages in the pistons to the walls. The oil control rings wipe the excess oil back through different passages in the pistons where it returns to the sump.
Actually, I would start by pulling the head, since it will have to come off anyway. And it's easier than the sump, and you can inspect the liner walls.
1) Cracking a fuel line takes the firing load off of a particular piston/rod/journal and will tell: a) which rod is knocking, and b) if the injector is dribbling and causing fuel to enter the combustion chamber prior to set timing (not unlike pre-ignition in a gasoline engine).
2) There is no "splash lubrication" on these engines. The cylinders are lubricated through rifle-drilled passages in the connecting rods via the crankshaft, to the gudgeon (wrist) pins, and through passages in the pistons to the walls. The oil control rings wipe the excess oil back through different passages in the pistons where it returns to the sump.
Actually, I would start by pulling the head, since it will have to come off anyway. And it's easier than the sump, and you can inspect the liner walls.