Are you for sure on the head gasket? Is it a crush type gasket? Is the oil leak coming from inside of the piston bore? Im not quite getting it. Blow by would be oil going into the piston bore passing thru wore out piston rings.
Well every engine has blow by it is where compression leaks past the rings into the crankcase and every engine has a crankcase vent to let it out the pressure and these diesel engines it goes straight through into the intake from the valve cover but my problem was the valve cover was sitting on top of the nut plugging the hole so it was building a lot of crankcase pressure. On the head gasket it had a copper ring for the Piston side of it and it had a rubber o-ring for where the push rods was and where the oil was leaking it wasn't a crush head gasket and also there's no oil Vine that pumps oil to The Head where the rocker arms are
beware of these mine has 66hrs and the fan grenaded and took out the armeture and windings,I see 2 more now with same problem for sale,one is a gas version
