Hello Mr Tore,
I FOUND IT!!! U-Boat Archive Series Volume 7, Report on U-570 - H.M.S. Graph - Page 70
Main Engine Liner
"Cylinder lubrication is by means of a Grutzner pump with tow connections to each liner, inboard and outboard. There are no oil groves cut in the liner walls and no holes are provided for piston slinging gear."
Main Engine Pistons
"They are fitted with 6 impulse rings, 1 upper scraper ring and 2 slotted scraper rings, Drain holes are drilled behind the 2 lower scraper rings and also in the oil catchment groves. The groves, 2 in number are situated immediately below each slotted scraper ring."
Don - Therefore, it looks like pump connection is situated so that the nozzle will always be in between the 7 top piston rings (compression rings) and the 2 lower scraper rings (oil control rings).
Exhaust and Induction Valves - Page 72
"The stems of both exhaust and induction valves are lubricated by a mechanical pump driven from a camshaft'"
Connecting Rods - Page 71
"The connecting rod has a large diameter bore through it, being reduced near the eye of the rod. The lubricating oil is taken round the gudgeon and fed through the pin through 4 holes at 45 degrees above and below horizontal."
The only thing that I'm not sure of is how are the rocker arms lubricated, Is the above describing how the rocker arm pivot point is being lubricated...?
Regards,
Don_