Yanmar 3JH4E Service Manual page 95

(28) Removing the idle gear
Loosen the three bolts holding the idle gear and pull out
the idle gear and shaft.
(29) Removing the camshaft
1) Push up tappet by turning a camshaft to remove it from the cylinder block easily.
2) Loosen the thrust metal bolts through the holes of the camshaft gear, and remove.
3) Pull out the camshaft gear and camshaft assembly from the cylinder block.
NOTE:
The camshaft gear and camshaft are shrunk fit They must be heated to 180-200°C to disassemble.
(30) Removing the pistons and connection rods
1) Loosen the rod bolts and remove the large end
cap.
2) Push the connecting rod and pull out the piston &
connecting rod assembly.
NOTE:
Place a tool for the piston cooling nozzle to make
sure the nozzle position does not change and it does
not get scratched.
4. Disassembly and Reassembly
Connecting rod
Piston
(Removing piston and connecting rod)
79
Bolt
Idle gear shaft
Idle gear
Rod bolt
Large end cap
Crankpin bearing