The GM30 is a pretty light diesel. Pulled mine with transmission
using a come along and 4x4 over the companionway
. Pulled it out by myself but took two people to push it back in and drop it onto the mounts. Set it on the sole on a piece of scrap plywood
. Was able to slide it around without too much difficulty to get at it from all sides. Even lighter if you take it out without the V drive.
My engine was fine but the PO's installation
to replace an A4 was crap. Engine was so far out of line it ate stern bearings in less than a 100 hours and was about a foot farther forward jutting into the galley than the A4. Had to carve away at the engine beds and relocate the mounts to move it back into the engine space and out of the galley. Took it out and put it back in at least 5 times trying to get clearance for flywheel and bell housing and proper height for the beds so it would align.
Since you've got the head off, would definitely have a machine shop check out the head for flatness and mill if necessary, replace the valve guides and do a valve job. Should cost well less than a boat unit to have that done. Two head gaskets with decrease the compression significantly and is a no no without miling the head to take off a corresponding amount of medal to compensate for the extra head gasket. Even then, don't know how it would work with the high compression of a diesel. It would be a last resort fix in utter desperation if you had to do it.
If the cylinder walls show no sign of wear, highly doubtful that the rings are a problem. Rings usually quit ceiling because the cylinder bores get ovaled by wear. With only 1100 hours on the engine would be wiling to bet your problem is an injector or injector pump
problem if there are no other issues with the head. The engine may be fed oil externally but it falls back to the sump through the head and block. If the gasket was soaked in oil, could have been a problem with the gasket. Not completely out of the realm of possibility that an oil passage
was not cut out properly on the gasket, BTDT. Assume the cylinder seals
on the gasket did not show signs of gas leaks
New style head gaskets usually don't require or is retorqueing reccomended after initial installation
. They seal properly on installation torqueing and can be deformed by retorqueing and shorten the life. after run in. The original style gaskets on Series Landrovers were copper and required retorquing after run in. New gaskets are a composite material with metal insert seals
around the cylinders, etc. Retorqueing verbotten on the new style. Check with Yanmar for their reccomendations.