Yanmar 1GM, Operation Manual

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2-e)
Loosen the high pressure pipe from the fuel pump. Turn the engine with the
starter motor, and at the same time tighten the cap nut of the high pressure pipe
if fuel comes out. Perform the same operation for each cylinder.
2-f)
After bleeding air from all of the cylinders,
turn the engine by the starter motor and make
sure that the injection sound of the fuel is a
strong high pitched "hiss". Be sure each
cylinder emits this hissing sound.
3) Fuel injection timing and spray
condition
Caution
Diesel fuel escaping under
pressure can have
sufficient force to penetrate
the skin, causing serious
personal injury. Before
disconnecting lines, be sure
to relieve all pressure in the
system, be sure no
connections are damaged.
Fluid escaping from a very
small hole can be almost invisible. Use a piece of cardboard or wood,
rather than hands, to search for suspected leaks. If injured by escaping
fluid, see a doctor at once. There can be serious infection or injury if
proper medical treatment is not administered immediately.
Important
Modification or alteration of the injection pump, the injection pump
timing, or the fuel injection valves in ways not recommended by the
manufacturer will terminate the warranty obligation to the purchaser.