Yanmar 3JH4E Service Manual page 93

(16) Removing the fuel injection nozzles
Remove the bolt for the fuel nozzle retainer, and pull out
the fuel nozzle retainer and fuel injection nozzle.
NOTE:
If the fuel nozzle protector stays in the cylinder head,
make a note of the cylinder number and be sure to
remove it when disassembling the cylinder head.
(17) Remove the fuel injection pump
1) Loosen the nut for fuel pump drive gear, and pull out the fuel pump drive gear /flange assembly with
an extraction tool.
2) Remove the fuel injection pump and O-ring from the gear case flange.
(18) Removing the rocker arm shaft assembly
1) Remove the rocker arm cover.
2) Remove the bolts(s) for the rocker arm shaft support, and remove the entire rocker arm shaft
assembly.
3) Pull out the push rods.
(19) Removing the cylinder head
1) Loosen the cylinder head bolts with a torque wrench, and remove the cylinder head.
2) Remove the cylinder head gasket.
(20) Removing the marine gearbox
Loosen the bolts for the clutch case flange, and remove the gearbox assembly
(21) Removing the flywheel
Loosen the flywheel bolts and remove the flywheel.
NOTE:
Be careful not to scratch the ring gear.
4. Disassembly and Reassembly
Bolt
Washer
Fuel nozzle
retainer
Cylinder head
(Fuel injection nozzle)
Bolt
(Removing flywheel)
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Fuel injection nozzle
Fuel nozzle protector
Fuel injection seat
Flywheel
Flywheel housing